An Improved Experimental Validation Method of Laser Shock Penning
一种改进的激光冲击强化效果实验验证方法

Surface strengthening technology can notably improve material fatigue performance and are widely used in aero component manufacturing. When the effect of strengthening technology on material fatigue performance is investigated, up-and-down method is often adopted. Aiming at the uncertainty of initial stress in up-and-down method, a new method is proposed to quickly determine the initial stress, based on the linear accumulated damage theory and the already known fatigue performance of the material before surface strengthening. The method was adopted in K417 material laser shock penning (LSP) validation test. Results show that the proper initial stress could be found by using 2 or 3 specimens. After vibration fatigue test of standard specimens with different surfces,it is concluded that LSP can notably improve material fatigue performance.