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Design and Analysis of Multilayer High Pressure Vessel

Author(s):

Tarun Mandalapu , SRM University; Ravi Krishnamoorthy. S, SRM University

Keywords:

Discontinuity, Multi-Layer Cylinders, Hoop Stress, Shrink Fit, Contact Pressure, Optimum Design, ANSYS

Abstract

The cylindrical vessels are used for storing fluids at high pressure. In cylinder the stress distribution is not uniform. Distribution of stress in the juncture area and the rest will differ vessel cause a geometric discontinuity of the vessel wall. So a stress concentration is created around the opening. The junction may fail due to these high stresses. Hence a detailed analysis is required to determine the stress distribution along the junction. Using the ASME formulae the discontinuity forces and moments are determined from which displacements and stresses are found out for individual as well as whole juncture. The stresses developed in pressure vessel is analyzed by using ANSYS. As a thick cylinder storing fluid with large internal pressure has second order non-linear variation in the hoop stress across the wall. For more uniform hoop stress distribution, compound cylinders are formed by shrinkage process where outer cylinder is heated until it will slide freely over inner cylinder thus exerting the required shrinkage pressure on cooling. Using the calculated shrinkage pressures between two contacting cylinders, it is possible to reduce the hoop stress and make it more or less uniform over the thickness. The methodology for minimization of volume of shrink-fitted three layer compound cylinder and to get equal maximum hoop stresses in all the cylinders. The analytical results are validated in comparison with FEM in ANSYS Workbench.

Other Details

Paper ID: IJSRDV3I2071
Published in: Volume : 3, Issue : 2
Publication Date: 01/05/2015
Page(s): 1076-1083

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