相同喷丸强度条件下喷丸强化效果的数值模拟研究  

Numerical Simulation Research on Strengthening Effect of Shot Peening at Identical Intensity

作　　者：盛湘飞[1] 李智 赵科宇 程秀全[3] SHENG Xiang-fei;LI Zhi;ZHAO Ke-yu;CHENG Xiu-quan(School of Mechanical Engineering,University of South China,Hengyang 421001,China;School of Aircraft Maintenance Engineering,Guangzhou Civil Aviation College,Guangzhou 510403,China;School of Architecture and Construction,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]南华大学土木工程学院,湖南衡阳421001 [3]广州民航职业技术学院飞机维修工程学院,广州510403

出　　处：《表面技术》2018年第9期42-48,共7页Surface Technology

基　　金：国家自然科学基金项目(51575117);国家自然科学基金(民航联合基金)(61179051);湖南省教育厅项目(15C1183)~~

摘　　要：目的优化喷丸工艺参数的匹配方式,进一步提升喷丸强化效果。方法采用预定义场和基于移动矢量的快速建模方法,实现了受喷构件表面100%表面覆盖率的喷丸模拟,并借助三维喷丸有限元模型研究了不同喷丸工艺参数匹配方式对受喷构件表面粗糙度、弹丸撞击时的能量转变方式的影响。结果当喷丸强度均为0.35 mmN时,四种喷丸工艺参数匹配方式对应的表面粗糙度分别为3.156、2.760、2.249、2.081μm,应力集中系数分别为1.205、1.142、1.103、1.071,动能消耗率分别为89.94%、85.53%、82.86%、80.04%,应变能转化率分别为7.99%、9.67%、11.82%、14.29%。结论与其他喷丸工艺参数匹配方式相比,所用喷丸工艺参数中弹丸直径愈大、喷射速度愈低,对应受喷构件表面粗糙度和应力集中系数愈小,有利于降低喷丸强化效果的削弱程度。在弹丸撞击初始动能大致相当的情况下,尽管"大弹丸直径+低喷射速度"参数条件下对应的动能消耗率较低,但应变能转化率较高,撞击过程中摩擦耗散能较少,有利于大塑性应变和残余压应力的产生,可获得较好的喷丸强化效果。The work aims to optimize matching method of shot peening process parameters,and to fiirther improve strengthening effect of shot peening.Predefined field and moving vector-based rapid modeling method were adopted to realize simulation of shot peening which covered 100%surface of the peed component.The influences of matching method of shot peening process parameters on surface roughness of peened component and conversion mode of impact energy were researched by using a 3D finite element model(FEM).Provided with shot peening intensity of 0.35 mmN,surface roughness,stress concentration factor,kinetic energy consumption ratio and strain energy conversion ratio corresponding to four kinds of matching methods of shot peening process parameters were(3.156(im,2.760|xm,2.249\mi,2.081|im),(1.205,1.142,1.103,1.071),(89.94%,85.53%,82.86%,80.04%)and(7.99%,9.67%,11.82%,14.29%),respectively.Compared with other matching methods of shot peening process parameters,among the used shot peening process parameters,the larger the shot diameter is,the lower the peening speed is,and the lower are surface roughness and stress concentration factor of the peened component,which helps reduce impairment effect of shot peening effect.Provided that initial kinetic energy of shot impact was nearly the same,under the parameter conditions of“a larger shot diameter+a lower impact velocity”,kinetic energy consumption ratio is lower but strain energy conversion ratio is higher,and friction dissipation energy is lower,which contributes to generation of larger plastic strain and residual compressive stress,and also a better effect of shot peening.

关 键 词：喷丸强度 表面粗糙度 应力集中 撞击能量 强化效果 数值模拟 

分 类 号：TG668[金属学及工艺—金属切削加工及机床]