Prediction of multiaxial fatigue life of bellows under internal pressure and axial displacement load
In this study,the bellows for a project was chosen as the research object to investigate the multiaxial fatigue life of the bellows under combined loading conditions of internal pressure and axial displacement using a newly proposed Modified Smith-Watson-Topper(MSWT)critical plane model.Due to the occurrence of plastic deformation at the peaks and valleys of the bellows under low-cycle displacement loads,a new damage parameter,DP,composed of plastic strain amplitude and maximum normal stress,was formulated.The critical plane,where the maximum DP value occurs,was defined as the plane where fatigue failure takes place.Numerical simulations of the bellows were conducted using the Abaqus software.Based on the results of the numerical analysis,the MSWT model predicts fatigue life of bellows under different operating conditions to be 3388 cycles and 6059 cycles,which shows good agreement with experimental results.This provides a certain reference for the design and development of bellows.
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