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STRUCTURAL ANALYSIS OF A ROTOMOLDED WATER TANK
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STRUCTURAL ANALYSIS OF A ROTOMOLDED WATER TANK
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 07 | July 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 236 STRUCTURAL ANALYSIS OF A ROTOMOLDED WATER TANK Omkar Edlabadkar PVG’S COET and GKPIOM Mechanical Engineering Pune Shubhankar Potdar PVG’S COET and GKPIOM) Mechanical Engineering Pune Himanshu Kumar Jha PVG’S COET and GKPIOM Mechanical Engineering Pune Prof.Dr. N.G. Jaiswal PVG’S COET and GKPIOM Project Guide Pune ------------------------------------------------------------------------------***-------------------------------------------------------------------------------- Abstract—Water tank is a structure used to store water for domestic and industrial purposes. These water tanks are mainly produced using rotational molding process. The material, thickness of the tanks and the number of layers vary according to the purpose of the tank. In this project, analysis of a water tank has been done for various materials and by simulating the various forces acting on it, optimum material combination isselected. I. INTRODUCTION The majority of the water tanks are manufactured using the rotational molding process. The materials considered in this project are in accordance with their suitability for rotational molding. In this project, a 5000L and 2-layered water tank is considered. The materials considered for this project are linear low density polyethylene (LLDPE), low density polyethylene (LDPE) and high density polyethylene (HDPE). II. LITERATURE REVIEW A. Rotational Molding Process Rotational molding incorporates a multi-step process using pulverized polymer materials, typically as a powder, which is loaded into a mold, which in turn is sent into an oven. It is then rotated slowly in effort to achieve a uniform wall thickness. The rotational molding process is used to produce hollow, seamless, one-piece plastic products for a never ending list of industry and applications. This manufacturing process does not induce any pressure into the manufacturing process unlike other plastics molding processes and hence the products formed are more durable. B. Polyethylene Polyethylene is a polyolefin made from the polymerization of ethylene (or ethene) monomer. It is a thermoplastic polymer having excellent impact strength and offer near-zero moisture absorption. It is classified on the basis of its density into low, medium and high density polyethylene. For this study, only low and high density polyethylene is considered. C. Low Density Polyethylene Low Density Polyethylene or LDPE is a soft, tough and light-weight polymer belonging to the Polyethylene branch of thermoplastics. It has a branched out structure because of which it has low density and low volume. It is often used where strength and stiffness of the structure are an important requirement. Following are its properties: Properties Value Density (kg/m3 ) 920 Young’s Modulus (Mpa) 300 Poisson’s Ratio 0.44 TABLE I PROPERTIES OF LDPE D. Linear Low Density Polyethylene Linear Low Density Polyethylene or LLDPE is a linear polymer with significant short branches. LLDPE structurally differs from LDPE, because LLDPE has shorter branches. It is used where there is a need of high impact strength and high flexibility. Following are its properties: Properties Value Density (kg/m3 ) 930 Young’s Modulus (Mpa) 360 Poisson’s Ratio 0.40 TABLE II PROPERTIES OF LLDPE E. High Density Polyethylene High Density Polyethylene or HDPE has a high strength- density ratio. It has little branching, giving it stronger tensile strength than LDPE. It is harder and opaque and can withstand higher temperatures. It is characterized by high ductility, high corrosion resistance and it is non-toxic. Following are its properties: Properties Value Density (kg/m3 ) 950 Young’s Modulus (Mpa) 1860 Poisson’s Ratio 0.46 TABLE III PROPERTIES OF HDPE
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 07 | July 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 237 III. METHODOLOGY Various materials were studied and on the basis of their properties, suitability for rotational molding and their availability, three polyethylene types were selected. A three- dimensional model of the two-layered water tank was created using a modeling software. The dimensions and other param- eters of the tank were obtained from the actual model. The model was then uploaded to a software where further analysis was done. The materials LLDPE,LDPE and HDPE were added to the database of the software and assigned to the tank model in several combinations. The forces considered were gravitational force and hydro static pressure, for which the water level was considered up to the lid of the tank. Meshing was carried out by using the appropriate mesh properties. The final results were calculated and results were obtained. Fig. 1. Isometric Sectional view of the water tank model IV. RESULTS Different material combinations were assigned to the water- tank layers and values like stress, strain and deformation were obtained. Fig.2 shows the normal stress induced in a LLDPE-LDPE tank. A LLDPE-LDPE tank means LLDPE was assigned to outer layer and LDPE was assigned to the inner layer. Sim- ulations and analysis were done for each combination of the materials and their results are summarized in table 4. Fig. 2. Meshed model Fig. 3. Normal stress generated in a LLDPE-LDPE tank Tanks Total Deformation(mm) Normal Stress(MPa) Strain Energy(mJ) LLDPE-LLDPE 7.9 2.46 64.74 LLDPE-LDPE 8.26 2.82 64.05 LLDPE-HDPE 3.83 10.32 41.18 LDPE-LLDPE 9.05 2.78 74.15 LDPE-LDPE 9.46 3.19 74.51 LDPE-HDPE 4.1 10.99 47.18 HDPE-LLDPE 2.18 1.95 11.78 HDPE-LDPE 2.23 1.89 12.18 HDPE-HDPE 1.52 TABLE 3.56 IV 11.74
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 07 | July 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 238 V. CONCLUSION • From the Table IV, it is seen that the normal stress for LDPE-HDPE water tank is the least among the combinations. • It can also be seen that the LLDPE-HDPE tank can bear a normal stress marginally lesser than that of the LDPE- HDPE tank. • Hence, it can be concluded that the tank with outer layer made up of LDPE and the inner layer made up of HDPE tank is the most optimum structure. [1] Material Selection for Rotational Moulding Process Using Grey Rela- tional Analysis Approach Bhavesh Chaudharya, PL. Ramkumarb, Kumar Abhishek (2018) [2] Roy J. Crawford and James L. Throne (Auth.) - Rotational Molding Technology (2001, William Andrew) [3] Static Structural Analysis of Water Tank , Pavol Lengvarsky*, Miroslav Pástor, Jozef Bocko, American Journal of Mechanical Engineering, 2015, Vol. 3, No. 6, 230-234 [4] Static and Dynamic Analysis of Water Tank by FEM: A Review , 2019 JETIR March 2019, Volume 6, Issue 3 [5] Optimization In TheDesign Of Fiber Reinforced Plastic Storage Tank, Akash Tiwari, Dr. Suwarna Torgal , INTERNATIONAL JOURNAL OF SCIENTIFIC TECHNOLOGY RESEARCH VOLUME 8, ISSUE 08, AUGUST 2019 [6] Modelling of FRP Cylinder for Stress Analysis V. Rishab Kanth, V. Balakrishna Murthy and A. V.Ratna Prasad, (IJERT) Vol.1 Issue 8, October – 2012 [7] Effect of oven residence time on mechanical properties in rotomoulding of LLDPE P L RAMKUMAR*, SACHIN D WAIGAONKAR and D M KULKARNI, Sa¯dhana¯ Vol. 41, No. 5, May 2016, pp. 571–582 [9] G. Beall, Rotational Molding: Design, Materials, Tooling, and Processing, Hanser/Gardner Publications, Cincinnati, OH, 1998. VI. REFERENCES [10] Adapted from M. Ezrin, Plastics Failure Guide: Cause and Prevention, Hanser/Gardner Publications, Cincinnati, OH, 1996, Table 1-1, p. 7. [11] Adapted from J.L. Throne, Technology of Thermoforming, Carl Hanser Verlag, Munich, 1996, p. 473. [12] C. Spyrakos, Finite Element Modeling in Engineering Practice, Includes Example with ALGOR, West Virginia University Press, Morgantown, WV, 1994. [13] G. Beall, Rotational Molding: Design, Materials, Tooling, and Process- ing, Hanser/Gardner Publications, Cincinnati, OH, 1998, pp. 94-97. [14] R.A. Malloy, Plastic Part Design for Injection Molding: An Introduc- tion, Carl Hanser Verlag, Munich, 1994, Chapter 4, ”Structural Design Considerations.” [15] R.J. Roark and W.C. Young, Formulas for Stress and Strain, 5th ed., McGraw-Hill Book Co., New York, 1975, Table 35 [8] Rotational Molding Cycle Time Reduction Using a Combination of Physical Techniques , M.Z. Abdullah,1 S. Bickerton,1 D. Bhattacharyya,1 R.J. Crawford,2 E. Harkin-Jones3
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