公开(公告)号：US20240362379A1

公开(公告)日：2024-10-31

申请号：US18309292

申请日：2023-04-28

申请人： FCA US LLC

发明人： Eniyavan Subramanian ,  Robert Keinti ,  Yung-Li Lee ,  Sandip Datta

IPC分类号： G06F30/23

CPC分类号： G06F30/23 ,  G06F2111/10

摘要： A method for predicting fatigue life of a structure includes providing a finite element (FE) model of the structure; calculating a modal stress and a frequency response function (FRF) of the FE model; calculating a stress power spectral density (PSD) matrix; calculating a damage transformation matrix [A]; calculating a covariance matrix from the stress PSD matrix; determining angles θ, φ, and ψ in a plane with maximum equivalent variance based on the calculated covariance matrix; and calculating a variance—damage parameter with the angles θ, φ, and ψ incremented in a predetermined amount of degrees to thereby identify critical planes where a fatigue crack will occur in the structure.