Experiment and finite element analysis on residual stress field in laser shock processing TC4 titanium alloy
1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Mechanical ＆ Electrical Engi neering, Jiangsu Vocational and Technical College of Finance Economics, Huaian, Jiangsu 223001 ,China）
Abstract：To improve the fatigue strength of TC4, Nd ： Glass pulse laser was used to shock the surface of TC4. X-ray stress analyzer was used to test the residual stress of the shocked area, and calculation was done by finite element software ABAQUS. The results show that there is a large residual stress on the surface of shocked material. When the power density is 3 GW · cm^-2, the amplitude of the residual compressive stress reaches to 400 MPa and the depth of residual stress layer reaches to 0.6 mm. There is good accordance between calculations and experimental tests. The results of finite element analysis with different power density show that when the power density is larger than 1.6 GW · cm^-2, there will be residual stress on the shocked area. As the power density increases, the residual compressive stress will also increase, until saturation. The results can be used as theoretical basis for optimizing the process parameters in laser shock processing.
2009, Vol. 30 
