Fatigue Life of 7005 Aluminum Alloy Cruciform Joint Considering Welding Residual Stress

Abstract

An evaluation method is proposed for determining the full fatigue life of aluminum alloy cruciform joint, including the crack initiation and propagation with welding residual stress. The results of simulations have shown that the boundary between the initiation and propagation stage is not constant, but a variable value. The residual stress leads to a significant reduction in both stages, which is more severe on initiation. With considering residual stress, the ratio of crack initiation to total life is below 7%. The effect of residual stress varies with external loading; when external load is lower, the residual stress has a greater effect.

Effect of optimized repaired structure with a hole on crack turning and fatigue life

“…Several scholars have analyzed the crack propagation and residual life of different structures. [6][7][8][9][10][11][12][13] He 14 provided a method for predicting the crack path of welded joints. The influence of the yield strength on the crack propagation path of the welded joint was analyzed without considering other mechanical properties and residual stress.…”

Investigation fatigue crack initiation and propagation cruciform welded joints by extended finite element method (XFEM) and implementation SED approach

“…Chen et al build a numerical model by XFEM and experimental investigation of crack growth in T-joints to better understand the mechanisms of crack growth in welded joints [4]. Wang et al also used XFEM for numerical simulation of the fatigue crack growth and suggested developing simple solutions for practical prediction of k M factors [5]. XFEM will be utilized to make a model of a semi-elliptical weld toe crack in a fillet weld for different sizes.…”