Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates

• We investigate the effect of EDR on residual stress distribution of hole.
• We predict the fatigue life of cold expansion hole based on critical plane approach.
• We study the effect of EDR on the fatigue life of hole based on WB model.

A finite element model is used to analyze the residual stress distribution around a cold expanded hole in a TC4 plate with various values of the edge distance ratio. The fatigue life of cold expanded hole is predicted using two models based on the critical plane approaches: SWT model and WB model. The predicted values are also compared with experimental results. The results show that the WB model achieves a better accuracy for cold expanded holes. When the edge distance ratio decreases, the residual tangential compressive stress and fatigue life of a cold expanded holes decrease.