基于喷丸残余应力场的疲劳裂纹扩展数值模拟  

Numerical Simulation of Fatigue Crack Propagation Based on Residual Stress Field of Shot Peening

作　　者：刁浩峰[1] 周迅[1] 陈大为[1] 吴飞[1] 

机构地区：[1]浙江理工大学机电产品可靠性技术研究浙江省重点实验室,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2014年第3期266-271,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省重点科技创新团队项目(2010R50005)

摘　　要：运用有限元软件ABAQUS建立喷丸强化有限元模型,研究冲击速度、弹丸半径、弹丸材料、覆盖率对残余应力场的影响。运用疲劳分析软件Msc.Fatigue建立了疲劳裂纹扩展分析模型,将非喷丸模型和喷丸模型的应力场导入Msc.Fatigue进行疲劳裂纹的扩展分析,比较研究残余应力场对疲劳裂纹扩展的影响。喷丸强化有限元模型的模拟结果表明,适当地增加冲击速度、弹丸半径、覆盖率等喷丸参数可以明显改善残余应力场的作用效果,钢丸喷丸产生的最大残余压应力值比玻璃丸喷丸产生的大。疲劳裂纹扩展分析模型的模拟结果表明,由于喷丸残余压应力场的作用,有效地改善了材料的疲劳性能,构件的疲劳裂纹扩展寿命提高了1.3倍。This paper uses finite element software ABAQUS to establish shot peening strengthening finite element model,studies the influence of impact speed,shot radius,shot material and coverage rate on residual stress field,uses fatigue analysis software Msc.Fatigue to establish fatigue crack propagation analysis model,guides the stress field of non-shot peening model and shot peening model into Msc.Fatigu for fatigue crack propagation analysis and conducts comparative study on the influence of residual stress field on fatigue crack propagation.The simulation result of shot peening strengthening finite element model shows that the appropriate increase of shot peening parameters such as impact speed,shot radius and coverage rate can significantly improve the effect of residual stress field and the maximum residual pressure stress value produced by steel shot is higher than that produced by glass shot.The simulation result of fatigue crack propagation analysis model shows that the action of shot peening residual pressure stress field effectively improves the fatigue performance of materials and the fatigue crack propagation life of components increases by 1.3times.

关 键 词：喷丸 数值模拟 残余应力场 疲劳裂纹扩展 

分 类 号：TG156[金属学及工艺—热处理]