2006 Volume 13 Issue 52 Pages 73-81
Several T-shaped welded joint models are analyzed by finite element method for low cycle fatigue assessment in this paper. Joint is subjected to random loading blocks and strain history is counted by range pair-range counting method. Endeavor is exerted to correlate local strain range of coarse FE model that ignores the weld toe profile with strain range obtained by fine FE model that simulates toe profile. Other parameters such as main geometrical parameters, material properties and loading pattern are also taken into account. After that, strain range relationship is established. Numerical results show that weld toe radius is the most influential factor while others' effects are insignificant. At last, proposed approach is introduced to the analysis of T shaped welded joint test. It turns out simple and convenient in low cycle fatigue assessment since cumbersome modeling of weld local profile becomes not necessary.