Fatigue Life Prediction of CCGA Package

A series of thermal cycle test conditions were set. 3D one eighth model for a CCGA (Ceramic Column Grid Array) package was built. Inelastic strain energy density accumulated per cycle in elements that fatigue fracture first occurs was calculated using finite element analysis. The relationship between the acceleration factor of thermal cycle fatigue life and inelastic strain energy density accumulated per cycle was obtained by linear fitting of simulation data and test fatigue life. Using this equation, modified Coffin–Manson equation of the CCGA package was determined. The lives of this CCGA package under different filed conditions were predicted using modified Coffin–Manson equation.