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IRJET- Analysis of Dimpled Sheet and its Optimization using Taguchi Method
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HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
IRJET- Analysis of Dimpled Sheet and its Optimization using Taguchi Method
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INTERNATIONAL RESEARCH JOURNAL
OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1154 Analysis of Dimpled Sheet and its Optimization using Taguchi Method Shruti Ambadkar1, Ankita Balel2, Shubham Harer3, Srinivas kadam4 1,2,3,4Department of Mechanical Engineering, Sinhagad Institute of Technology and Science, Narhe, Pune, India -----------------------------------------------------------------***----------------------------------------------------------------------- Abstract – The dimpling process converts plain sheet into a dimpled sheet which gives higher energy absorption performance in various materials. In this paper effect of dimpling process on mechanical properties like tensile strength, a Yield strength of mild steel, stainless steel and aluminum was studied experimentally and numerically. First sheets were analyzed experimentally by using Taguchi’s optimization method. Experimentally the manufacturing of the dimpled sheet was done by a punch and die tools. In this paper mild steel, aluminum and stainless-steel dimple sheet properties were evaluated for various properties numerical simulation of dimpling process was done in Ansys software. The simulation of the dimpling process and tensile test of the plain and dimpled specimens predicted similar behavior to experimental measurements and tests. Keywords – Taguchi method, orthogonal arrays, S/N ratio, DOE I. INTRODUCTION The dimpling process is a cold roll forming process which includes dimpling of a flat strip. It is done to improve the material properties of the respective strip or material and its structural properties also maintaining minimum strip thickness. In this process punch and die, the method is used because it allows better flexibility regarding to size, dimension and efficiency. Solid metal pie is used in operation of punch an die, a punch is situated vertically above the die. Dimpling process is thus done by using a punch and die method. Proper material selection was done for better design and its optimization. Thus, by looking at various parameters aluminum, stainless steel and mild steel were selected. Various tests like chemical composition, tensile test, stress-strain graph have been concluded before the optimization. First tests have been done of a plain sheet and later on for dimpled sheet. After all these processes, the Taguchi method is used for optimization. Taguchi methods are statistical methods developed by Genichi Taguchi to improve the quality of manufactured goods and more currently also applied to engineering, biotechnology, marketing and advertising. However, Taguchi got to know methods of identifying those noise sources, which have the greatest effects on product variability. After applying the same, optimum values have been found out for each material. As it is trial and error method aim was to increase the strength of the dimpled sheet as the dimpling process increases the strength of the material. II. METHODOLOGY: 1. MATERIAL SELECTION: Material selection is the main part or step in the design of the component or selection of the component. It is the easiest and simple step but it is the main step which has a huge impact or drastic change on the extreme performance of the component. It is the most effective step in design engineering. The industrialization and commercialization of the final component rely on proper material selection. If a proper material selection is not done than even the best design can be failed. Criteria for material selection: Material selection can be done on the basis of their properties and depending upon our needs for the design of the component. For the best outcome, the proper material combination is selected. Properties like mechanical properties, wear and corrosion, ability to manufacture, economically feasible, availability in suitable sizes. The material must have strength and stiffness values. Should be anti-corrosive should not be extremely prone to corrosion. The material should be able to machine at a minimum cost. We should try to ensure the required sizes of material which are easily available. 2. MATERIAL TESTING: I. MILD STEEL: Mild steel is lighter in weight as compared to stainless steel since it has less carbon content. Mild steel is also relatively cheaper than other materials with similar mechanical properties. 1.1 Properties: Grade – 40800 Standard – IS: 737-2008 VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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INTERNATIONAL RESEARCH JOURNAL
OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1155 1.2 Chemical Properties: Tensile Test: II. ALUMINIUM: Aluminium is extremely strong in spite of its lightweight as its density is almost one-third of that of steel. The surface of aluminium oxidises immediately when it comes in contact with oxygen from the air and protects the material underneath against corrosion. Thus, aluminium is corrosion resistant and protects itself. Aluminium can even withstand extreme temperatures without its properties being compromised. In extreme cold aluminium becomes even tougher and its hardness increases. 2.1 Properties: Grade – 40800 Standard – IS: 737-2008 2.2 Chemical Properties: Tensile Test: III. Stainless steel: Stainless steel is low carbon steel that must have a minimum of 10% chromium. The addition of chromium to the steel causes the formation of a chromium-oxide film which gives stainless steel its unique properties such as its resistance to corrosion and its ability to heal itself when in the presence of oxygen. 3.1 Properties: Grade – X 04 Ci 19 Ni 9 Standard – IS: 6911:1992/AISI 304 3.2 Chemical Properties: Tensile Test: Experimental Procedure for UTM: Yield strength 186 Tensile strength 310 % elongation 34.7 Yield strength 154 Tensile strength 168 % elongation 4.42 VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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INTERNATIONAL RESEARCH JOURNAL
OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1156 1. Place the metal sheet correctly under Universal Testing Machine (UTM). 2. Place the load applying tool in UTM. 3. Fix correctly the tool to avoid any irregularities or errors. 4. Bring the load very close to the specimen. 5. Align the specimen with respect to the load applying tool. 6. Bring the indicator to absolute zero. 7. Start applying load on the specimen. 8. As we apply load on the specimen, the body starts to deform. 9. Perform this experiment for required loads Tensile test for plain sheets: The tensile test is carried out on a Universal testing machine. Dimensions of the test specimen are as follows Length=300 mm Breadth = 30 mm Thickness= 1mm The following results on Ultimate tensile strength and yield strength were obtained. Material UTS ( Kg- N/mm2) Yield Strength (Kg- N/mm2 % Elongation Stainless steel 578 323 30.76 Mild steel 310 186 34.7 Aluminium 168 154 4.42 Fig: Stress Vs Strain graph for plain aluminium sheet Yield strength 373 Tensile strength 578 % elongation 30.76 VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1157 Fig Stress Vs Strain graph for plain Stainless-Steel sheet Fig. Stress Vs Strain graph for plain mild Steel sheet Taguchi Method The Taguchi method is a powerful tool for designing high-quality systems. The approach is based on the Taguchi method, the signal-to-noise (S/N) ratio and the analysis of variance (ANOVA) are employed to study the performance characteristics. The Dimpling process is a novel cold roll forming process that involves dimpling of a rolled flat strip prior to the roll forming operation. This process is done to upgrade the material properties and the subsequent product`s structural performance while maintaining a minimum strip thickness. Taguchi Methodology Taguchi’s method is a powerful technique for the design of a high-quality system. It provides not only, an efficient, but also a systematic way to optimize designs for performance and quality. The methodology used: • Identify the quality characteristics and select process parameters to be evaluated. • Select the appropriate orthogonal array and assign these parameters to the orthogonal array & design the matrix. • Conduct the experiments as per the design matrix based on the arrangement of the orthogonal array. & Recording of responses • Analyse the experimental results using the signal to noise(S/N) ratio and analysis of variance (ANOVA) by using Design Expert software. Taguchi specified three situations Based on a Design of Experiments (DOE) methodology for determining parameter levels DOE is an important tool for designing processes and products. A method for quantitatively identifying the right inputs and parameter levels for making a high-quality product or service. 1) Larger the better (for example, agricultural yield) 2) Smaller the better (for example, carbon dioxide emissions); and 3) On-target, minimum-variation (for example, a mating part in an assembly). VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1158 Orthogonal Arrays Taguchi's orthogonal arrays are highly fractional orthogonal designs. These designs can be used to estimate main effects using only a few experimental runs. Consider the L4 array shown in the next Figure. The L4 array is denoted as L4(2^3). L4 means the array requires 4 runs. 2^3 indicates that the design estimates up to three main effects at 2 levels each. The L4 array can be used to estimate three main effects using four runs provided that the two factor and three-factor interactions can be ignored. Depth Centre distance Diameter 1 10 2 2 12 3 Fig: Original variation Table Sr. No Depth Distance Diameter A 1 10×10 2 B 1 12×12 3 C 2 10×10 3 D 2 12×12 2 Thus, we manufacture dimpled sheets for the above variations for the three selected materials. After manufacturing of these dimpled sheets for the 4 given variations, we performed a tensile test for all the manufactured specimens on UTM. Tensile test for dimpled sheets: 1. Aluminium: Sr.no 1 2 3 4 Depth 1 2 1 2 Centre Distance 12 10 10 12 Diameter 3 3 2 2 UTS 156 114 172 116 Yield Strength 142 96 146 93 VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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INTERNATIONAL RESEARCH JOURNAL
OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1159 2. Stainless Steel: Sr.no 1 2 3 4 Depth 1 2 1 2 Centre Distance 12 10 10 12 Diameter 3 3 2 2 UTS 564 567 582 582 Yield Strength 279 259 259 295 3. Mild Steel: Sr.no 1 2 3 4 Depth 1 2 1 2 Centre Distance 12 10 10 12 Diameter 3 3 2 2 UTS 336 329 339 333 Yield Strength 241 225 238 243 VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1160 Optimization by Taguchi Method: Optimization of the process parameters is done to have great control over quality productivity and cost aspects of the process. For optimization process values obtained of UTS for respective material has been added. UTS Results for Mild Steel, Analysis of created Taguchi Design Selection of analysis of Taguchi's design in Minitab software. For designing high- quality system Taguchi's method is a powerful tool. III. RESULT The result has been obtained for the three material i.e. Aluminium, mild steel and stainless steel. The value for the S/N ratio and standard deviation has been found out for all three. Their values can be used for the optimization process. The S/N ratio in the table was evaluated by using the equation. The evaluated mean S/N ratio with various factors at the various level are summarized in the S/N ratio response table, the procedure was also followed for aluminium and stainless steel. 1. Aluminium: Table no 4.7 Optimization for Aluminium using Minitab software: 2. Mild Steel: Table no 4.8 Optimization for Mild Steel Minitab software: 3. Stainless steel: Table no 4.9 Optimization for Stainless Steel Minitab software: VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1161 IV. RESULT AND DISCUSSION Aluminium: The values of the signal to noise ratio for aluminium for larger is better criteria are given in the table below. Table no.5.1 Response Table for signal to noise ratio Levels Depth Centre distance Diameter 1 44.29 42.92 43.00 2 41.21 42.58 42.50 Graph no. 5.1 Mean of SN Ratio of Aluminium The figure shows that S/N ratio is highest at lower level i.e. 1mm for depth and at 2mm diameter. The plot for distance is almost horizontal showing that S/N ratio is unaffected by the change in the level of distance. Hence it shows that the combination of a high level of depth and diameter along with any level of distance can give the minimum S/N ratio in the design. From the above table no.5.1, we can see that the best combination occurs for level 1 at depth, centre distance and diameter. The values of these parameters at the given level are noted in the table below. Table no.5.2 Optimized values of selected parameters Depth(mm) Centre distance(mm) diameter UTS (Kg- N/mm2 ) 1 10 2 172 Stainless steel: The values of the signal to noise ratio for Stainless Steel for larger is better criteria are given in the table below: Table No: Response Table for the signal to noise ratio Levels Depth Centre Distance Diameter 1 55.16 55.19 55.30 2 55.19 55.16 55.05 Graph no. 5.2 Mean of SN Ratio Stainless steel VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1162 In order to minimize the variability, the aim is to minimize the standard deviation. Fig shows signal to noise ratio is lower at a higher level, i.e. 1mm depth and at 2mm diameter. The plot of distance is almost horizontal that S/N ratio is unaffected by the change in the level of distance. Hence it shows that the combination of the low level of depth and diameter along with any level of distance can give maximum S/N ratio in the design. From the above table, we can see that the best combination occurs for level 2 at depth, level 1 for centre distance and diameter. The values of these parameters at the given level are noted in the table below. Table no.5.4 Optimized values of selected parameters Depth Centre distance Diameter UTS (Kg- N/mm2) 2 10 2 582 Mild Steel: The values of the signal to noise ratio for Mild Steel for larger is better criteria are given in the table below. Table no.5.5 Response Table for signal to noise ratio Levels Depth Centre Distance Diameter 1 50.57 50.47 50.59 2 50.40 50.49 50.44 Graph no.5.3 Mean of SN Ratio of mild steel The figure shows that S/N ratio is highest at lower level i.e 1mm for depth and at 2mm diameter. The plot for distance is almost horizontal showing that S/N ratio is unaffected by the change in the level of distance. Hence it shows that the combination of a high level of depth and diameter along with any level of distance can give the minimum S/N ratio in the design. From table no. we can see that the best combination occurs for level 1 at depth, level 2 for centre distance and diameter. The values of these parameters at the given level are noted in the table below [15]. Table No: Optimized values of the selected parameter Depth Centre distance Diameter UTS (Kg- N/mm2) 1 12 3 336 V. CONCLUSIONS This project illustrates the application of the parameter design (Taguchi method) in the optimized results of a dimpled sheet. The conclusions can be drawn based on the above experimental of this study are that: For Mild Steel Taguchi design has been successfully applied to obtain a design which gives the better result of the dimpled sheet as compared to a plain sheet. The analysis suggests that the combination of depth 1mm, centre distance 12mm and diameter 3mm with the UTS value of 582 results into the design of optimum value. VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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INTERNATIONAL RESEARCH JOURNAL
OF ENGINEERING AND TECHNOLOGY (IRJET) E-ISSN: 2395-0056 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1163 For Aluminium Taguchi design has been successfully applied to obtain a design which gives the better result of the dimpled sheet as compared to the plain sheet. The analysis suggests that the combination of (Taguchi method) in the optimization of the dimpled sheet. The conclusions can be drawn based on the above experimental results of this study is that Taguchi’s Method of parameter design can be performed with the lesser number of experimentations as compared to that of full factorial analysis and yields similar results. It is found that the parameter design of the Taguchi method provides a simple, systematic, and efficient methodology for optimizing the process parameters. For Stainless Steel Taguchi design has been successfully applied to obtain a design which gives the better result of the dimpled sheet as compared to the plain sheet. The analysis suggests that the combination of depth 2mm, centre distance 10mm and diameter 2mm with the UTS value of 336 results into the design of optimum value. For Mild Steel Taguchi design has been successfully applied to obtain a design which gives the better result of the dimpled sheet as compared to the plain sheet. The analysis suggests that the combination of depth 1mm, centre distance 12mm and diameter 3mm with the UTS value of 582 results into the design of optimum value. ACKNOWLEDGEMENT The authors are thankful to the “Hadley Group” research work for providing essential data and reference for this study. REFERENCES 1. V.B. Nguyen, C.J. Wang, D.J. Mynors, M.A. English and M.A Castellucci – Compressive Strength Tests and design 2. M. Lu, et al., “Novel customized manufacturable DFM solutions,” Proc. SPIE Photomask Technology 2012, vol. 8522, pp. 852223, December 2012. 3. Sergio Gomez and Francesc Moll. “Lithography aware regular cell design based on a predictive technology model.” J. Low Power Electronics, 6(4):1–14, 2010 4. B. Le Gratiet, F. Sundermann, J. Massin, et al., "Improved CD control for 45-40 nm CMOS logic patterning: anticipation for 32-28 nm", In Proceedings of SPIE Vol. 7638,76380A (2010) 5. Shi-Hao Chen, Ke-Cheng Chu, Jiing-Yuan Lin and Cheng-Hong Tsai “DFM/DFY practices during physical designs for timing, signal integrity, and power” 2007 IEEE conference. 6. Wing Chiu Tam and Shawn Blanton “To DFM or Not to DFM” IEEE Asia Pacific Conference on Circuits and Systems, 2006. 7. Raina Rajesh “What is DFM & DFY and Why Should I Care?” INTERNATIONAL TEST CONFERENCE 2009 8. Garg Manish, Kumar Aatish “Litho-driven Layouts for Reducing Performance Variability” IEEE 2005 9. Daehyun Jang, Naya Ha, Joo-Hyun Park, Seung-Weon Paek “DFM Optimization of Standard Cells Considering Random and Systematic Defect” International SoC Design Conference 2008 10. Sergio Gomez, Francesc Moll, Antonio Rubio “Design Guidelines towards Compact Litho-Friendly Regular cells” SPIE Photomask Technology 2012 11. "Design for Manufacturability" http://www.mentor.com/blogs/ 12. “Litho Friendly Design kit, a tool of DFM strategy”, (http://www.eetimes.com/electrical-engineers/education- training/tech-papers/4130133/Litho-Friendly-Design-Kit-A-Tool-of-DFM-Strategy) VOLUME: 06 ISSUE: 10 | OCT 2019 WWW.IRJET.NET P-ISSN: 2395-0072
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