Numerical simulation on laser shock peening of TC4 titanium alloy

The continuous explicit dynamic impact strategy was used to carry out the numerical simulation study on laser shock peening of TC4 titanium alloy for aviation. According to the shock wave energy change curve, the solution time 3 000 ns of a single shock was determined, and the stress wave propagation process was analyzed. On this basis, a multi-point impact simulation was carried out, and the effects of power density, impact times and spot overlap rate on residual stress and strain field were analyzed. It was concluded that increasing the power density had a better effect on increasing the residual compressive stress on the surface; increasing the number of impacts had a better effect on increasing the depth of the residual compressive stress; the 50% spot overlap rate effectively avoided uneven impact and overlap gaps phenomenon. The change trend of the residual compressive stress on the surface of the specimen obtained by the experiment and the simulation was the same, and the numerical value was basically consistent. When the impact was 1 and 3 times, the errors of these two were 4.1% and 2.6%, respectively, indicating that the simulation results have certain reference significance.