Failure criteria in the design of Composite pressure vessels

Abstract

Applications of composite pressure vessels in premium applications newlinesuch as the aerospace industry keep engineering researchers in motivation. In newlinecomposite pressure vessels, the determination of burst pressure is done in newlinedifferent styles. Though many researchers have extensively contributed to this newlinecause by damage modeling, they have made negative remarks also on the newlineresults obtained while using the damage model. This thesis follows an explicit newlineapproach to find the bursting pressure of composite pressure vessels to get rid newlineof complex damage modeling difficulties and severe solution convergence newlineproblems. newlineTo identify a suitable failure criterion, a comparative study on various newlinefailure criteria is carried out in the evaluation of first-ply failure pressure newlineusing FEA software ANSYS. The failure is identified by comparing the stress newlinecomponents with the relevant strength values. Literature test data from two newlinesources have been utilized. Maximum stress criterion is good to be newlinerecommended for the design of composite pressure vessels and this has an newlineadditional advantage of its simplicity and ability to identify the mode of newlinefailure. newlineIn the progressive analysis for the determination of bursting pressure, newlinevarious researchers recommend stiffness reduction factors ranging from 10-6 newlineto 10-1 for the stiffness degradation. While pressurizing to higher values, with newlinethese reduction factors, either solution is not converged or accuracy is newlineaffected. In the proposed method, unit internal pressure is always applied and newlinestresses for higher internal pressure are calculated by linear extrapolation newline