— Continuing our previous researches on UHMWPE (Ultra-High-Molecular-Weight Polyethylene) based implant material and its fusion with Ca-alginate, we describe new methods for preparing Ca-alginate blended UHMWPE samples and how we extended the testing of the prepared samples. If sufficient content of Ca-alginate can be achieved and the Calcium-alginate blended UHMWPE can be made, it might lead to an implant material which can promote bone formation. Earlier result shows that the Calcium–alginate contentwill be formed in the structure of UHMWPE. Using our new modified methods we can make polyethylene samples with sufficiently tough alginate content which can withstand washing and sterilization as that is shown in the paper. Since we had modified the UHMWPE specimens with Ca-alginates we carried out different types of wear testing on the prepared samples.
TRIBOLOGICAL BEHAVIOUR OF A356/10SiC/3Gr HYBRID COMPOSITE IN DRY-SLIDING COND...Blaza Stojanovic
The paper presents tribological behaviour of hybrid aluminium composite A356/10SiC/3Gr in dry-sliding conditions. Hybrid
composites were made with a modified compocasting procedure and tribological tests were conducted on a tribometer with a block-on-disc contact geometry. An analysis of the effects of three sliding speeds ((0.25, 0.5 and 1) m/s) and two normal loads (10 N and 20 N) on the wear volume and wear rate was conducted for different sliding distances. The total sliding distance was 300 m. SEM and an EDS analysis of the wear surfaces of the tested material were also performed. The analysis of the wear surfaces shows an intensive adhesive wear of hybrid composites. Also, the appearance of mechanically mixed layers (MMLs) was confirmed, i.e., an increase in the concentration of iron in the hybrid composite material.
Keywords: hybrid composites, wear, aluminium, SiC, graphite, testing
Experimental Investigations on Tribiological Properties of 6061-T6 Al Alloy b...IJAEMSJORNAL
Microstructure and tribological properties of Al-TiB2 nano surface composite fabricated by Friction Stir Processing (FSP) were evaluated. To vary the percentage of TiB2 three different slot thickness viz. 1mm, 1.5 mm and 2mm were considered. Microstructural evaluations showed a nearly uniform distribution of TiB2 in the aluminium matrix after FSP with the addition of composite powder. Microhardness test results shoes FSW of Al6061-T6 alloy with 2mm groove width has more hardness. tribological properties were evaluated at two different sliding velocities 0.314m/s and 0.48m/s and results shows that at lower loads there is no much difference in wear rate of surface composite made with different slot sizes but with increase in load and sliding velocity wear rate was increased , however, larger slot Al6061-TiB2 Surface composites show better wear resistance.
Tribologoical Properties of Vinyl Ester Based Hybrid Composite with Tio2, Al2...ijtsrd
Composite materials play a vital role in many industrial applications. Researchers are working on fabrication of new composite materials worldwide to enhance the applicability of these materials. In view of this the mechanical performance of the composite material is essential. The aim of this project is to assist in the main objective of optimizing the quantity of the filler material Al2O3, TiO2 and MoS2. Thus the mechanical properties as well as the wear properties of 7.5 , 10 and 12.5 of the filler material as mentioned above has been investigated to obtain an optimum composition for the application in suitable fields. The purpose of this project is to perform an experimental study of the pin on disc wear of neat Vinyl Ester and Al2O3, TiO2 and MoS2 filler of 7.5 , 10 and 12.5 filled particulate reinforced composites have been investigated along with the subsequent study of the Wear Properties of the material with the intention to contribute to the final aim of optimizing the composition of the composite material. The investigation is carried out by mixing different weight percentages of the powder with the polyester resin and preparing individual samples. After CSM preparation, the materials were properly mixed using the hand-lay techniques and different specimens were prepared with different compositions of the powder. After all the samples were prepared, Wear Testing is done by pin on disc Wear Testing Machine in ASTM-G99 standard using abrasive paper. The load applied 1KN , 2KN and 3KN in this experiment with sliding distances of 353.25m , 706.5 and 1059.75m respectively. Mr. Kuruba Harish | Mr. D. Harshavardhan | Mr. A. Ramesh "Tribologoical Properties of Vinyl Ester Based Hybrid Composite with Tio2, Al2o3 & Mos2 Fillers" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-2 , February 2019, URL: https://www.ijtsrd.com/papers/ijtsrd21385.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/21385/tribologoical-properties-of-vinyl-ester-based-hybrid-composite-with-tio2-al2o3-and-mos2-fillers/mr-kuruba-harish
In the present study, coatings were deposited on CrC-NiCrFeSiBCoC(80%-20% )a
Fe based SS316 steel substrate to reduce the damage caused by erosion boiler
applications. Erosion studies were conducted on uncoated as well as HVOF coated steels.
The erosion experiments were carried out using an air-jet erosion test rig according to
ASTM G-76 standard at a velocity of 30 m/s and at different impingement angles of 30°,
60° and 90°. The HVOF spraying leads to a high retention of CrC in the coating matrix
accompanied with lower porosity The high velocity oxy-fuel (HVOF) sprayed CrCNiCrFeSiBCoC(
80%-20% )coatings on 316SS boiler tube steal exhibit composite ductile
or brittle modes of erosion under angular alumina sand erodent of size 50 impacted
at 30m/s. The HVOF spraying leads to a high retention of CrC in the coating matrix
accompanied with lower porosity.
Comparison of performance of the bonded and loosely bonded magnetic abrasiveseSAT Journals
Abstract In modern industry presently requirement of finely finished surface has been the major demand as per the technological advancements. in comparison to conventional machining methods the unconventional machining methods provide better surface finish .Magnetic abrasive finishing is a process which is able to remove the material at micro/nano from the metallic and non metallic surfaces . The magnetic abrasives play the major role in MAF. Literature reveals different techniques such as sintering, plasma, chemical etc. for manufacturing of bonded magnetic abrasives in present paper the bonded abrasives are prepared by sintering and is used for internal finishing of brass tubes. The rough bored brass samples are finely finished by newly developed magnetic abrasives and loosely bonded abrasives prepared by silicone gel and the comparison of performance was studied. The material removal rate was also studied.
TRIBOLOGICAL BEHAVIOUR OF A356/10SiC/3Gr HYBRID COMPOSITE IN DRY-SLIDING COND...Blaza Stojanovic
The paper presents tribological behaviour of hybrid aluminium composite A356/10SiC/3Gr in dry-sliding conditions. Hybrid
composites were made with a modified compocasting procedure and tribological tests were conducted on a tribometer with a block-on-disc contact geometry. An analysis of the effects of three sliding speeds ((0.25, 0.5 and 1) m/s) and two normal loads (10 N and 20 N) on the wear volume and wear rate was conducted for different sliding distances. The total sliding distance was 300 m. SEM and an EDS analysis of the wear surfaces of the tested material were also performed. The analysis of the wear surfaces shows an intensive adhesive wear of hybrid composites. Also, the appearance of mechanically mixed layers (MMLs) was confirmed, i.e., an increase in the concentration of iron in the hybrid composite material.
Keywords: hybrid composites, wear, aluminium, SiC, graphite, testing
Experimental Investigations on Tribiological Properties of 6061-T6 Al Alloy b...IJAEMSJORNAL
Microstructure and tribological properties of Al-TiB2 nano surface composite fabricated by Friction Stir Processing (FSP) were evaluated. To vary the percentage of TiB2 three different slot thickness viz. 1mm, 1.5 mm and 2mm were considered. Microstructural evaluations showed a nearly uniform distribution of TiB2 in the aluminium matrix after FSP with the addition of composite powder. Microhardness test results shoes FSW of Al6061-T6 alloy with 2mm groove width has more hardness. tribological properties were evaluated at two different sliding velocities 0.314m/s and 0.48m/s and results shows that at lower loads there is no much difference in wear rate of surface composite made with different slot sizes but with increase in load and sliding velocity wear rate was increased , however, larger slot Al6061-TiB2 Surface composites show better wear resistance.
Tribologoical Properties of Vinyl Ester Based Hybrid Composite with Tio2, Al2...ijtsrd
Composite materials play a vital role in many industrial applications. Researchers are working on fabrication of new composite materials worldwide to enhance the applicability of these materials. In view of this the mechanical performance of the composite material is essential. The aim of this project is to assist in the main objective of optimizing the quantity of the filler material Al2O3, TiO2 and MoS2. Thus the mechanical properties as well as the wear properties of 7.5 , 10 and 12.5 of the filler material as mentioned above has been investigated to obtain an optimum composition for the application in suitable fields. The purpose of this project is to perform an experimental study of the pin on disc wear of neat Vinyl Ester and Al2O3, TiO2 and MoS2 filler of 7.5 , 10 and 12.5 filled particulate reinforced composites have been investigated along with the subsequent study of the Wear Properties of the material with the intention to contribute to the final aim of optimizing the composition of the composite material. The investigation is carried out by mixing different weight percentages of the powder with the polyester resin and preparing individual samples. After CSM preparation, the materials were properly mixed using the hand-lay techniques and different specimens were prepared with different compositions of the powder. After all the samples were prepared, Wear Testing is done by pin on disc Wear Testing Machine in ASTM-G99 standard using abrasive paper. The load applied 1KN , 2KN and 3KN in this experiment with sliding distances of 353.25m , 706.5 and 1059.75m respectively. Mr. Kuruba Harish | Mr. D. Harshavardhan | Mr. A. Ramesh "Tribologoical Properties of Vinyl Ester Based Hybrid Composite with Tio2, Al2o3 & Mos2 Fillers" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-2 , February 2019, URL: https://www.ijtsrd.com/papers/ijtsrd21385.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/21385/tribologoical-properties-of-vinyl-ester-based-hybrid-composite-with-tio2-al2o3-and-mos2-fillers/mr-kuruba-harish
In the present study, coatings were deposited on CrC-NiCrFeSiBCoC(80%-20% )a
Fe based SS316 steel substrate to reduce the damage caused by erosion boiler
applications. Erosion studies were conducted on uncoated as well as HVOF coated steels.
The erosion experiments were carried out using an air-jet erosion test rig according to
ASTM G-76 standard at a velocity of 30 m/s and at different impingement angles of 30°,
60° and 90°. The HVOF spraying leads to a high retention of CrC in the coating matrix
accompanied with lower porosity The high velocity oxy-fuel (HVOF) sprayed CrCNiCrFeSiBCoC(
80%-20% )coatings on 316SS boiler tube steal exhibit composite ductile
or brittle modes of erosion under angular alumina sand erodent of size 50 impacted
at 30m/s. The HVOF spraying leads to a high retention of CrC in the coating matrix
accompanied with lower porosity.
Comparison of performance of the bonded and loosely bonded magnetic abrasiveseSAT Journals
Abstract In modern industry presently requirement of finely finished surface has been the major demand as per the technological advancements. in comparison to conventional machining methods the unconventional machining methods provide better surface finish .Magnetic abrasive finishing is a process which is able to remove the material at micro/nano from the metallic and non metallic surfaces . The magnetic abrasives play the major role in MAF. Literature reveals different techniques such as sintering, plasma, chemical etc. for manufacturing of bonded magnetic abrasives in present paper the bonded abrasives are prepared by sintering and is used for internal finishing of brass tubes. The rough bored brass samples are finely finished by newly developed magnetic abrasives and loosely bonded abrasives prepared by silicone gel and the comparison of performance was studied. The material removal rate was also studied.
Carbon Nanotubes as Solid Lubricant Additives for Antiwear Performance Enhanc...IJMER
The working conditions in many industrial applications cause the tribo pair to operate in
the mixed lubrication regime. Since the lubricant film thickness under these conditions is insufficient to
separate the sliding tribo pair, therefore usage of lubricant with anti-wear additives is essential. The
carbon nano-tubes (CNT) have recently emerged as lubricant additive having extraordinary tribological
properties. In the present work, experiments have been conducted on block and disk test setup to
determine the effect of using CNT as anti-wear additive in a commercial lubricant. Varying quantities of
the CNT have been tried in the lubricant to conduct the wear tests. The wear of the block is quantified in
terms of its weight loss after the test. The results of the wear tests are reported.
Effect of process parameters using friction stir processing /welding of steel...Husain Mehdi
Microstructural changes and flow of material have be comprehensively studied by many researchers. A lot of studies have been conducted by changing the process parameters such as axial load, feed, speed of the tool, tool geometry, tool tilt angle etc. to find the optimum process parameters. Friction stir welding can be applied on various materials such as aluminum, manganese, copper. Till date majority of the research and development was done on aluminum alloys. This is so because Al alloys are easy to deform at relatively low temperatures (approximately below 550 Celsius). Also, they are easier to weld as compared to other materials. But these days a lot of studies are being conducted on carrying out friction stir processing on steel. This process improves mechanical properties like tensile strength, ductility, micro-hardness etc.
This is the presentation of my 8th semester project on Application of Artificial Neural Network in Friction Stir Processing. We have used AA5052. The presentation starts from the basics of Aluminium and FSP process and then first we predict the properties of Hardness, Roughness and Tensile strength using Minitab16 and then use Minitab16 to create dummy outputs which are fed into the ANN to train it.
Manufacturing of Surface Composite Al6351/SIC Using Friction Stir ProcessingIJSRD
Friction stir welding (FSW) is a relatively new solid-state joining process. This joining technique is energy efficient, environment friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. FSW is considered to be the most significant development in metal joining in a decade. Recently, friction stir processing (FSP) was developed for microstructural modification of metallic materials. In this study, SiC particles and Methanol paste were incorporated by using Friction Stir Processing (FSP) into the 6351 aluminum alloy to form particulate composite materials. Samples were subjected to traverse speeds of the FSP tool with and without Paste (SiC+ Methanol). Microstructural observations were carried out by employing optical microscopy of the modified surfaces. For the 100% overlapping, No. of passes caused grain modification in the processed zone.
In this work, the synthetic Hydroxyapatite (HAP)
was studied using different preparation routes to
decrease the crystal size and was studied the
temperature effect on the nano-sized hydroxyapatite
crystallization. X-ray diffraction (XRD) analysis
indicated the all samples were composed by a
crystalline HAP phase and another amorphous part.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Experimental study on hardness for sintered si cp reinforced ammcs using the ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
EXPERIMENTAL INVESTIGATION AND MATERIAL CHARACTERIZATION OF A356 BASED COMPO...sathish sak
Recently friction stir processing (FSP) has emerged as an effective tool for enhancing sheet metal properties through microstructure modification. Significant grain refinement and homogenization can be achieved in a single FSP pass leading to improved formability, especially at elevated temperatures.
FSP is a solid-state process where the material within the processed zone undergoes intense plastic deformation resulting in dynamically recrystallized grain structure.
Most of the research conducted on FSP focuses on aluminum alloys. Despite the potential weight reduction that can be achieved using Titanium dioxide(B4C) alloys.
In this work, we examine the possibility of using FSP to modify the microstructure and properties of commercial A356-B4C alloy particles. The effect of various process parameters on thermal histories, resulting microstructure and properties to be investigated.
— Previous researches were made on UHMWPE (Ultra-High-Molecular-Weight-Polyethylene) based implant material and its fusion with Ca-alginate. New methods were made for preparing UHMWPE-Ca-alginate blends. If the coating Ca-alginate salt can be achieved on the surface of UHMWPE, it might lead to an implant material which could promote the bone formation. Earlier results show that we can make the coating layer on the polymer powder surface. Our new approach is to modify the method we made earlier, and this way the alginate layer can withstand washing and sterilization as it's shown in the paper. We also realized that the layer slowly can give off Ca2+ ions which can be absorbed with specific cells. Since we modified the surface structure of the UHMWPE samples we carried out wear testing of the new prepared samples. All of these measurements and experiments have been done as preparative ones to make one time real prosthetic material.
Carbon Nanotubes as Solid Lubricant Additives for Antiwear Performance Enhanc...IJMER
The working conditions in many industrial applications cause the tribo pair to operate in
the mixed lubrication regime. Since the lubricant film thickness under these conditions is insufficient to
separate the sliding tribo pair, therefore usage of lubricant with anti-wear additives is essential. The
carbon nano-tubes (CNT) have recently emerged as lubricant additive having extraordinary tribological
properties. In the present work, experiments have been conducted on block and disk test setup to
determine the effect of using CNT as anti-wear additive in a commercial lubricant. Varying quantities of
the CNT have been tried in the lubricant to conduct the wear tests. The wear of the block is quantified in
terms of its weight loss after the test. The results of the wear tests are reported.
Effect of process parameters using friction stir processing /welding of steel...Husain Mehdi
Microstructural changes and flow of material have be comprehensively studied by many researchers. A lot of studies have been conducted by changing the process parameters such as axial load, feed, speed of the tool, tool geometry, tool tilt angle etc. to find the optimum process parameters. Friction stir welding can be applied on various materials such as aluminum, manganese, copper. Till date majority of the research and development was done on aluminum alloys. This is so because Al alloys are easy to deform at relatively low temperatures (approximately below 550 Celsius). Also, they are easier to weld as compared to other materials. But these days a lot of studies are being conducted on carrying out friction stir processing on steel. This process improves mechanical properties like tensile strength, ductility, micro-hardness etc.
This is the presentation of my 8th semester project on Application of Artificial Neural Network in Friction Stir Processing. We have used AA5052. The presentation starts from the basics of Aluminium and FSP process and then first we predict the properties of Hardness, Roughness and Tensile strength using Minitab16 and then use Minitab16 to create dummy outputs which are fed into the ANN to train it.
Manufacturing of Surface Composite Al6351/SIC Using Friction Stir ProcessingIJSRD
Friction stir welding (FSW) is a relatively new solid-state joining process. This joining technique is energy efficient, environment friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. FSW is considered to be the most significant development in metal joining in a decade. Recently, friction stir processing (FSP) was developed for microstructural modification of metallic materials. In this study, SiC particles and Methanol paste were incorporated by using Friction Stir Processing (FSP) into the 6351 aluminum alloy to form particulate composite materials. Samples were subjected to traverse speeds of the FSP tool with and without Paste (SiC+ Methanol). Microstructural observations were carried out by employing optical microscopy of the modified surfaces. For the 100% overlapping, No. of passes caused grain modification in the processed zone.
In this work, the synthetic Hydroxyapatite (HAP)
was studied using different preparation routes to
decrease the crystal size and was studied the
temperature effect on the nano-sized hydroxyapatite
crystallization. X-ray diffraction (XRD) analysis
indicated the all samples were composed by a
crystalline HAP phase and another amorphous part.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Experimental study on hardness for sintered si cp reinforced ammcs using the ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
EXPERIMENTAL INVESTIGATION AND MATERIAL CHARACTERIZATION OF A356 BASED COMPO...sathish sak
Recently friction stir processing (FSP) has emerged as an effective tool for enhancing sheet metal properties through microstructure modification. Significant grain refinement and homogenization can be achieved in a single FSP pass leading to improved formability, especially at elevated temperatures.
FSP is a solid-state process where the material within the processed zone undergoes intense plastic deformation resulting in dynamically recrystallized grain structure.
Most of the research conducted on FSP focuses on aluminum alloys. Despite the potential weight reduction that can be achieved using Titanium dioxide(B4C) alloys.
In this work, we examine the possibility of using FSP to modify the microstructure and properties of commercial A356-B4C alloy particles. The effect of various process parameters on thermal histories, resulting microstructure and properties to be investigated.
— Previous researches were made on UHMWPE (Ultra-High-Molecular-Weight-Polyethylene) based implant material and its fusion with Ca-alginate. New methods were made for preparing UHMWPE-Ca-alginate blends. If the coating Ca-alginate salt can be achieved on the surface of UHMWPE, it might lead to an implant material which could promote the bone formation. Earlier results show that we can make the coating layer on the polymer powder surface. Our new approach is to modify the method we made earlier, and this way the alginate layer can withstand washing and sterilization as it's shown in the paper. We also realized that the layer slowly can give off Ca2+ ions which can be absorbed with specific cells. Since we modified the surface structure of the UHMWPE samples we carried out wear testing of the new prepared samples. All of these measurements and experiments have been done as preparative ones to make one time real prosthetic material.
Seminar entitled " Surface modification of woollen textiles " presented in department of Textiles and Apparel Designing, College of Community Science, UASD, Karnataka by Manpreet Kaur and Dr. Geeta Mahale.
Nanofillers are emerging class of fillers, which are used extensively in rubbers and plastics.
In the present work, effect of alumina nanoparticle addition on the mechanical and wear behavior of
reinforced acrylonitrile butadiene styrene (ABS) polymer has been investigated
Recently new methodology SPD technique is developed for equal channel angular pressing with parallel channels. Present paper addresses the ECAP, that is applied to the Al alloys 6063 and pure Cu. The Al6063 alloy and pure Cu is subjected to ECAP at room temperature for 2 passes to study the effect on the micro structure and mechanical properties after processing. .To investigates the ECAP processed billets. CAP was done using a 90° die.
Dry Sliding Wear Behaviour of Rheocat Al-5.7Si-2Cu-0.3Mg AlloyDr. Manal Abdullatif
In this study, the effect of improved microstructure of Al-5.7Si-2Cu-0.3Mg alloys by using semisolid process on hardness and dry sliding wear behaviour were investigated. The microstructures of conventional cast alloy were totally dendritic, while in rheocasting the dendrit-ic transfer to fine globular microstructures after using cooling slope casting. Tribological tests were carried out by using a pin-on-disc apparatus in dry sliding conditions. Wear tests were at low sliding speed 1ms-1 ,applied load at 50N and three different sliding distance (i.e., 1.8Km, 5.4Km and 9Km) respectively. An optical microscope and a scanning electron microscope were used to examine the micro-structure and to understand the wear mechanism on the worn surface of both samples. The results showed that, the wear resistance of rheocast alloy was improved and higher than that those produce by conventional casting. The volume loss of rheocast alloy show reduc-tion more than 18% at 1.8Km and 10% at 9Km compared to as-cast alloy. Moderate wear regimes were appeared in both alloys, accord-ing to the range of wear rate. The friction coefficient had increased due to increase in the contact point between pin and disc materials. The dominant wear mechanism for conventional and rheocasting alloys was adhesion wear and abrasive wear respectively.
Improving Mechanical Properties of AL 7075 alloy by Equal Channel Angular Ext...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Abstract: Bagasse is a cellulose fiber remaining after the extraction of the sugar-bearing juice from sugarcane. It is a valuable byproduct in sugar milling and is often used as a primary fuel source due to its high calorific value required to supply most energy requirement for most sugar factory operations. The burning of baggase leaves solid black particles known as sugar cane baggase ash (SCBA). Utilization of this waste material as partial replacement of cement in concrete provides a satisfactory solution to some of the economical, environmental and concerns associated with waste management. SCBA is normally disposed as landfills, exposure to these dusts causes chronic lung condition and its application on agricultural lands results to heavy metals concentrations in soils. It has been reported by several researchers that SCBA has intrinsic characteristic such as high content of silica in the form of quartz. This research mainly focused on SCBA disposed as solid wastes from Nzoia Sugar Company, Bungoma County in western Kenya. The research design adopted was Experimental. Granulometric indices of SCBA were determined through sieving the samples and weight retained. Strength Activity Index test, was used to assess the Pozzolanic activity of SCBA. Results showed that SCBA exhibits high Pozzolanic activity, hence can be used as a substitute cementitious material.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
Water billing management system project report.pdfKamal Acharya
Our project entitled “Water Billing Management System” aims is to generate Water bill with all the charges and penalty. Manual system that is employed is extremely laborious and quite inadequate. It only makes the process more difficult and hard.
The aim of our project is to develop a system that is meant to partially computerize the work performed in the Water Board like generating monthly Water bill, record of consuming unit of water, store record of the customer and previous unpaid record.
We used HTML/PHP as front end and MYSQL as back end for developing our project. HTML is primarily a visual design environment. We can create a android application by designing the form and that make up the user interface. Adding android application code to the form and the objects such as buttons and text boxes on them and adding any required support code in additional modular.
MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software. It is a stable ,reliable and the powerful solution with the advanced features and advantages which are as follows: Data Security.MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
KuberTENes Birthday Bash Guadalajara - K8sGPT first impressionsVictor Morales
K8sGPT is a tool that analyzes and diagnoses Kubernetes clusters. This presentation was used to share the requirements and dependencies to deploy K8sGPT in a local environment.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Tribological Examination of Calcium alginate – UHMWPE blends
1. International Multispecialty Journal of Health (IMJH) ISSN: [2395-6291] [Vol-4, Issue-5, May- 2018]
Page | 167
Tribological Examination of Calcium alginate – UHMWPE
blends
Gabriella Zsoldos1
, Viktor Palfalusi2
, Tamas Szivos3
University of Miskolc, Institute of Ceramics and Polymer Engineering, H-3515 Miskolc-Egyetemvaros Hungary
Abstract— Continuing our previous researches on UHMWPE (Ultra-High- Molecular-Weight
Polyethylene) based implant material and its fusion with Ca-alginate, we describe new methods for
preparing Ca-alginate blended UHMWPE samples and how we extended the testing of the prepared
samples. If sufficient content of Ca-alginate can be achieved and the Calcium-alginate blended
UHMWPE can be made, it might lead to an implant material which can promote bone formation.
Earlier result shows that the Calcium–alginate contentwill be formed in the structure of UHMWPE.
Using our new modified methods we can make polyethylene samples with sufficiently tough alginate
content which can withstand washing and sterilization as that is shown in the paper. Since we had
modified the UHMWPE specimens with Ca-alginates we carried out different types of wear testing on
the prepared samples.
Keywords— UHMWPE, Na-alginate, Ca-alginate.
I. INTRODUCTION
According to our earlier experience with UHMWPE implant materials, by modifying the surface
properties of these materials using acrylate type monomers and thereby enhancing its wear resistance, it
was our special interest to evaluate whether further surface modifying would improve the
biocompatibility of the prosthetic material [1-3]. We realized quite early that the same method of bulk
surface modification, which had been worked well with materials like methyl-methcrylate monomer
(MMA) [4,5], would not yield a useful surface with the hydrophilic alginate material. That prompted us
to work with powder type UHMWPE. We made basic experiments with GUR 4210 UHMWE powder to
form an alginate coating which could trap calcium from calcium solutions; we determined the optimal
sequence of the treatments, and the necessity of etching the UHMWPE powder [6].
We used GUR 1020 UHMWE powder for the majority of our experiments described here, and we
carried out two different modification methods in order to form insoluble alginate layers. After
preparation of the samples, morphological examinations, Ca2+
ion extraction tests and wear tests were
carried out [7-9].
II. APPLIED METHODS AND MATERIALS
The used UHMWPE material is GUR 1020 (Average molecular weight: 4×106
g/mol (Mw)) powder.
Two different methods were used in order to form the calcinated alginate layer.
First method: In the first step the sodium alginate's (ISP Alginates) aqueous solution (2 wt% solution)
and then the calcium chloride (2 wt% aqueous solution) was sprayed onto the polymer powder.
2. International Multispecialty Journal of Health (IMJH) ISSN: [2395-6291] [Vol-4, Issue-5, May- 2018]
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Second method: In the first step the sodium alginate (ISP Alginates) solution (2 wt% aqueous solution)
then the calcium sulfate (2 wt% aqueous solution) was sprayed onto the polymer powder. This order of
steps is considered as the “direct” order.
The methods were repeated in a reverse order as well. First, the treatment with the Ca-salt solution then
the alginate spray coating.
The samples were heated at 50 °C for 1 day. The treated and untreated UHMWPE powder was
compressed into sheets at 175 °C. After the forming, 20 kGy gamma irradiation followed, simulating
sterilization of implant components.
III. MEASUREMENTS
We used FTIR spectra to check the alginate content on the surface of the blends.
3.1 FTIR spectra
FTIR tests were carried out by Bruker Tensor 27 instrument in ATR mode, with 64 scans.
After the alginated powders had been pressed into the sheets, FTIR measurements were carried out to
check the alginate’s presence in the sample. The CaSO4 treated samples caused higher peaks between
1080 and 1050 cm-1
vawe numbers in the spectra than the CaCl2 treated ones. (Fig.1.)
After both treatments (CaCl2 and CaSO4) the FTIR spectra showed alginate peaks between 1750 and
750 cm-1
wave numbers. (Fig.2.)
We also tested the presence of the alginate components after irradiation. The result is that the samples
show less alginate content but it is still present on the surface of the blends. (Fig.3.)
FIGURE.1: FTIR SPECTRA ON PRESSED UHMWPE ALGINATE BLEND SHEETS
(Black – GUR1020; Magenta – GUR1020-CaSO4-alginated blend, Red – GUR1020-CaCl2-alginated blend)
3. International Multispecialty Journal of Health (IMJH) ISSN: [2395-6291] [Vol-4, Issue-5, May- 2018]
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FIGURE.2: FTIR SPECTRA ON PRESSED AND IRRADIATED UHMWPE CACL2-
ALGINATED BLEND SHEETS
(Black – GUR1020; Red – GUR1020-CaCl2-alginated blend, Gold – GUR1020-CaCl2-alginated blend after irradiation
treatment)
FIGURE.3: FTIR SPECTRA ON IRRADIATED UHMWPE ALGINATED BLEND SHEETS
AFTER IRRADIATION TREATMENT
(Red – GUR1020; Blue – GUR1020-CaCl2-alginated blend, Dark blue – GUR1020-CaSO4-alginated blend)
3.2 Tribological tests
We also used the samples for the wear tests which had been prepared using the “direct” order, first
alginate- than Calcium treatments.
Unidirectional wear test were carried out on samples using a CSM pin-on-disc tribometer. The pin
material was 6Cr100 chromium bearing steel 6 mm diameter polished spherical surface with a surface
roughness of Ra~0.01 μm. The loading normal force was 10 N, the rotation speed was 10 cm/s and the
wearing distance was 1000m. The tribological tests were performed along a circle with a radius of 8 mm
at room temperatures.
The resulting traces of wear on for the samples were measured using 3+Surtronic wear profile measurer,
and from which the deformed volume was calculated (Fig.4. and Table 1.).
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TABLE 1
THE DEFORMATION RESULTS ON ALGINATED UHMWPE BLENDS
Material Deformed volume (µm3
)
UHMWPE 192.43
CaCl2-alginated UHMWPE 54.51
CaSO4-alginated UHMWPE 102.18
0,0 0,5 1,0 1,5 2,0
-15
-10
-5
0
5
Deformedprofileaveragedepth,m
Deformed profile average width, mm
CaSO4
CaCl2
UHMWPE
FIGURE.4: PROFILE CURVE MEASUREMENT RESULTS ON IRRADIATED UHMWPE ALGINATED BLEND
SHEETS
(Black – GUR1020, Green – GUR1020-CaCl2-alginated blend, Red – GUR1020-CaSO4-alginated blend)
The results showed that the CaSO4 treatment reduces the wear deformation to the half of the original,
while the CaCl2 treatment reduced it further to the quarter of that.
The profile curves show these differences as well, the normal UHMWPE deformed path is wider and
deeper than the sample paths containing Ca-alginate.
3.3 Cross-shear wearing test
This type of measurement was important for us because the movement of the hip cause complex worn
surface[1-3,10]. We chose a pentangle as the way to find out what happens at the cross points (Fig.5.). A
CNC turning-lathe was used to make the measurement. The pin material was 6Cr100 chromium bearing
steel 6, 75 mm diameter polished spherical surface with a surface roughness of Ra~0.01 μm. The
loading normal force was 10 N, the speed was 1200 mm/min on a 55 mm distance with 5000 period.
After all the periods we analysed the cross points of the pentangle with a microscope. In case of this
type of wear measurement could be reproducing the real wear mechanism like in the hip joint. So we
can analyse the debris size and shape could be possibly presence in case of these new materials. The
debris size is important because these debris is irritated the phagocytes up to 10 μm [1,11-16].]
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FIGURE 5: THE PENTANGLE CROSS SHEAR WEAR PROFILE
We made 25 x 25 mm samples for the measurements. After measuring 200x enlargement pictures had
been formed to make debris analysis. Equal surfaces were used to evaluate how many debrises had got
off from the surface of the cross point (Fig.6.).The reason why the debrises get offis that the bounds can
not move any more and are getting weak by the time and finally brake. The size of the worn arewas
smaller in case of the both Ca-alginated UHMWPEsamples than the virgin UHMWPE one (Table 2).
An analyser process was used to determine the precise data’s [17].
TABLE 2
RESULTS OF COMPUTER ANALYSIS
Sample
Average worn surface
(µm2
)
Average worn
surface in %
Worn area
(piece)
Average diameter of
worn area
(µm)
UHMWPE 31,057.35 11.73 29.50 49.98
CaCl2-alginated
UHMWPE
50,250.33 18.98 53.67 35.99
CaSO4-alginated
UHMWPE
19,005.76 7.18 36.50 28.21
FIGURE 6: A MICROSCOPE RECORD ABOUT THE CROSS PATH ON THE UHMWPE SAMPLE
The overall analysed surface was 264,804 µm2
. We experienced the biggest worn surface in case of the
CaCl2-alginated UHMWPE sample. Both blends showed lower resistance against wearing in the amount
of the worn area but they had smaller diameters than in the UHMWPE sample (Fig.7.). The smaller
worn area could determine that the debris size could be smaller as well.
6. International Multispecialty Journal of Health (IMJH) ISSN: [2395-6291] [Vol-4, Issue-5, May- 2018]
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FIGURE 7: IMAGE OF CASO4-ALGINATED UHMWPE SAMPLEAFTERTHEANALISERPROCESS
The resulting traces of wear on for the samples were also measured using 3+Surtronic wear profile
measurer, and from which the deformed volume was calculated (Fig.8. and Table 3).
TABLE 3
RESULTS OF THE PROFILE MEASURING METHOD
Sample Average width (mm) Average depth (µm) The deepest point(µm)
UHMWPE 1.50 16.5 18
CaCl2-alginated UHMWPE 1.50 19.5 21
CaSO4-alginated UHMWPE 1.38 19.5 21
The results show that the average width and depth of the profiles are almost equal and the same could be
observed in case of the deepest points. The cross-shear wear resistance properties of the alginate treated
samples are as good as the virgin material. It may be because higher amount of volume got off from the
surface in case of the alginated ones.
The debris came off from the surface because they cannot resist this type of various forces and they
cannot orientate more. The bounds get weaker and after all they broke.
FIGURE 8: PROFILE CURVE MEASUREMENT RESULTS ON IRRADIATED UHMWPE ALGINATED BLEND
ON THE CROSS PATH
(Black – GUR1020, Green – GUR1020-CaCl2-alginated blend, Red – GUR1020-CaSO4-alginated blend)
7. International Multispecialty Journal of Health (IMJH) ISSN: [2395-6291] [Vol-4, Issue-5, May- 2018]
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IV. SUMMARY
UHMWPE has beneficial properties and provides advantages for utilization in human body as a raw
material for joint prosthesys. Using Ca-alginate as blend for could be introduces positive effect on the
mechanical behavior of the polymer. This paper evaluates the two different types of UHMWPE - Ca-
alginate blends unidirectional and cross-shear wear tribology properties. The unidirectional wearing
properties could be increased with the both Ca-alginate treatments. The debris sizes also decreasing in
the cross-shear pathes, but the deformed cross -section profiles of paths are not decreased efficiently.
Our experiments were carried out on GUR 1020 UHMWPE powder. We would also like to carry out
these tests on production UHMWPE hip joint cups too, to check that the alginate is able to adhere to the
surface of a processed hip joint cup. All of these measurements and experiments were done as
preparative ones to make one time real prosthetic material.
ACKNOWLEDGEMENTS
„ Supported by the ÚNKP-17-2-I-ME/6 New National Excellence Program of the Ministry of
Human Capacities”
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest regarding the publication of this paper.
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