喷丸强化过程及冲击效应的数值模拟.pdfVIP

46 1 Vol.46 No.1 2010 1 111—117 ACTA METALLURGICA SINICA Jan. 2010 pp.111–117 ∗ Æ (, , 100191) LS–DYNA , , Al 2024–T3 ; , ; ; . , ; ζ , ζ=1/2 ; , ; ; , , , . , , , , , TG142.7 A 0412−1961(2010)01−0111−07 NUMERICAL SIMULATIONS OF SHOT–PEENING PROCESS AND IMPACT EFFECT ZHANG Hongwei, ZHANG Yidu, WU Qiong School of Mechanical Engineering and Automation, Beihang University, State Key Laboratory of Virtual Reality Technology and Systems, Beijing 100191 Correspondent: ZHANG Hongwei, Tel: (010 E-mail: zhanghw@me.buaa.edu.cn Supported by State Key Laboratory of Virtual Reality Technology and Systems Manuscript received 2009–05–12, in revised form 2009–09–08 ABSTRACT The shot–peening process and impact effect were simulated by using software LS– DYNA. Propagation and interaction of stress waves in the treated material were analyzed based on numerical simulation results. The stress wave structure, high strain–rate effect and attenuation of stress wave were also investigated. The overlapping ratio between shots was studied and the high peening coverage model was established. The effects of impact sequence, material strain–rate and initial residual stress on the residual stress and the surface deformation were examined. The results indicate that the high strain–rate induced by shot impact is related to the elastic and plastic wave structure. The surface quality is essentially affected by overlapping ratio and its approximate critical value is found to be 1/2. The effect of impact sequence can be neglected, but the strain