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重点解决了激光冲击强化后试件的疲劳仿真,进一步深入研究了激光冲击强化对疲劳寿命的影响。对两组7050-T7451铝合金试件进行了拉拉疲劳试验,两组试件分为普通试件和激光冲击强化试件。试验结果表明,在101.3 MPa的加载应力水平下,两组平均疲劳寿命分别为26024和108336周次,疲劳寿命提高到原来的416.3%。利用有限元软件对两组试件分别进行疲劳数值模拟。模拟结果显示,两种疲劳寿命分别为25400和102870周次,疲劳寿命提高到原来的405%。试验结果和模拟结果符合得很好。研究表明,激光冲击强化后会在试件表层产生压应力,可以显著提高试件的疲劳寿命。
Focused on the fatigue simulation of the specimen after laser shock and further study the impact of laser shock on the fatigue life. Two sets of 7050-T7451 aluminum alloy specimens were pulled fatigue test, the two groups of specimens were divided into ordinary specimens and laser impact enhanced specimens. The experimental results show that under the loading stress of 101.3 MPa, the average fatigue life of the two groups are 26024 and 108336 cycles respectively, and the fatigue life is increased to 416.3%. The finite element software was used to simulate the fatigue of two groups of specimens respectively. The simulation results show that the fatigue life of the two kinds are 25400 and 102870 cycles respectively, and the fatigue life is increased to 405% of the original. The test results are in good agreement with the simulation results. The research shows that after the laser shock intensification, compressive stress will be generated on the surface of the specimen, which can significantly improve the fatigue life of the specimen.