单丸粒喷丸模型和多丸粒喷丸模型的有限元模拟  

Finite Element Analysis for Shot-Peening Models of Single Shot Impact and Multiple Impingement

作　　者：李雁淮[1] 王飞[2] 吕坚 徐可为[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]西安交通大学航天航空学院,西安710049 [3]LASMIS,University of Technology of Troyes,troyesfrance10010

出　　处：《西安交通大学学报》2007年第3期348-352,共5页Journal of Xi'an Jiaotong University

摘　　要：采用有限元法模拟喷丸过程,通过比较单丸粒模型和多丸粒模型,研究了喷丸覆盖率对残余应力和材料强化的影响.单丸粒多次冲击模型的模拟结果表明,冲击次数对残余应力幅值影响小,但等效塑性应变明显增加,由此可反映喷丸过程中材料的强化;多丸粒模型的模拟结果表明,当喷丸覆盖率为100%时,残余压应力幅值明显增加,塑性应变与单丸粒一次冲击结果相近.不锈钢喷丸试验结果表明,这两种模型的综合可较好地反映喷丸残余应力的形成和表层材料的强化.The influence of coverage ratio on the residual stress and mechanical properties of a material is investigated by the finite element simulations of the shot-peening models of single shot impact and multiple impingement. For the single shot impact model, the equivalent plastic strain increases with the peening frequency, but the residual stress is not significantly affected by the frequency, and therefore the material is strengthened by the peening frequency. For the multiple impingement model, the residual stress amplitude increases as the 100% coverage ratio is taken into account, and the equivalent plastic strain is similar with that in the single shot impact simulation. The experimental results of a stainless steel demonstrate that the combination of the two models is suitable for analyzing shot-peening process.

关 键 词：喷丸 有限元 残余应力 不锈钢 

分 类 号：TG142.7[一般工业技术—材料科学与工程]