TB6钛合金激光喷丸与机械喷丸残余应力场有限元模拟

Finite Element Simulation of Residual Stress Field in TB6 Titanium Alloy Induced by Laser Shock Peening and Shot Peening

利用有限元软件建立了TB6钛合金激光喷丸以及机械喷丸的三维数值分析模型,研究了不同工艺参数对残余应力场的影响;对比了两种喷丸工艺所形成的应力波和各自的衰减规律;研究了两种喷丸工艺的复合强化工艺对残余应力场的影响。结果表明:激光喷丸形成的平面波造成较深的应力影响层,深度可达1.5mm;机械喷丸形成的球面波产生较大的残余应力,最大残余压应力可以达到屈服强度的1.1倍。塑性应变越大残余应力越大,塑性应变层与残余应力影响层深度相近;在两者复合强化工艺中,残余应力影响层深度与激光喷丸的相近,最大残余压应力可达屈服强度的1.2倍。

Two 3D finite element models for laser shock peening（LSP） and shot peening（SP） were established. To indicate the effects of the process parameters, and the composite processing, and the stress wave decay laws, the tests were carried out. The results show that the plane wave induced by LSP forms deeper stress affected layer with the depth reaching 1.5 mm ; the spherical waves induced by SP form a larger residual stress with the maximum reaching 1.1 times of the yield strength. The greater plastic strain causes the greater of residual stress, the depth of strain and the depth of residual stress affected layer were similar. In the composite process, the depth of residual stress affected layer was close to that of LSP, and the maximum residual stress reaches 1.2 times of the yield strength.