摘要
目的建立随机喷丸模型,模拟喷丸改善Q235B焊接接头残余应力场。方法首先,建立Q235B焊接接头模型,通过间接耦合法计算焊接残余应力。然后,将残余应力作为初始条件导入焊接接头喷丸模型,研究弹丸直径d、弹丸速度v、弹丸入射角θ和弹丸质量流量r_(m)对焊接接头残余应力场的影响规律。最后,分析喷丸后焊接接头残余应力场的改善情况。结果焊后焊缝横向残余应力σ_(x)和纵向残余应力σ_(z)分别可达227、196 MPa,调整喷丸参数可以消除残余拉应力并引入残余压应力。本仿真范围内,d=1 mm、θ=60°、v=60 m/s、r_(m)=9 kg/min为最优喷丸参数,此时对于σ_(x)和σ_(z),表面残余压应力分别可达-246、-275 MPa,最大残余压应力分别为-306、-310 MPa,最大残余压应力深度分别为0.24、0.27 mm,残余压应力层深度分别为0.78、0.66 mm。结论无论是σ_(x),还是σ_(z),增大d和θ,最大残余压应力深度和残余压应力层深度显著增大;增大v,最大残余压应力、最大残余压应力深度和残余压应力层深度显著增加。因此,喷丸强化能够明显改善Q235B焊接接头残余应力场。
The work aims to simulate improvement of residual stress field of welded joint by establishing random shot peening(SP)model.Firstly,the model of Q235B welded joint was established,and the residual stress of the welded joint was calculated by indirect coupling method.Then,the residual stress was introduced into the SP model of the welded joint as the initial condition to evaluate the influence law of shot diameter d,shot velocity v,shot impact angleθand shot mass flow rate rm on the residual stress field of the welded joint.Finally,the improvement of residual stress field of welded joint after SP was analyzed.The results show that the transverse residual stressσ_(x)and the longitudinal residual stressσ_(z)of the weld seam can reach 227 MPa and 196 MPa as welded,respectively.Adjusting SP parameters can eliminate tensile residual stress and introduce compressive residual stress.In this simulation d=1 mm、θ=60°、v=60 m/s、r_(m)=9 kg/min are the optimal SP parameters.Forσ_(x)andσ_(z),the corresponding surface compressive residual stress can reach-246 MPa and-275 MPa,the corresponding maximum compressive residual stress are-306 MPa and-310 MPa,the corresponding depths of the maximum compressive residual stress are 0.24 mm and 0.27 mm,and the corresponding depths of the compressive residual stress layer are 0.78 mm and 0.66 mm.Whetherσ_(x)orσ_(z),the depth of the maximum compressive residual stress and the depth of the compressive residual stress layer significantly increase with the increase of d andθ,and increasing v can significantly increase the maximum compressive residual stress,the depth of the maximum compressive residual stress and the depth of the compressive residual stress layer.So SP can improve residual stress field of welded joint efficiently.
作者
邢家麒
吴跟上
赵树森
贺占蜀
李延民
邵景干
余桧鑫
XING Jia-qi;WU Gen-shang;ZHAO Shu-sen;HE Zhan-shu;LI Yan-min;SHAO Jing-gan;YU Hui-xin(Henan Province Engineering Laboratory for Anti-fatigue Manufacturing Technology,School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Highway,Henan College of Transportation,Zhengzhou 450005,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2021年第9期70-80,共11页
Surface Technology
基金
国家自然科学基金项目(51305408)
河南省交通运输重点科技计划项目(2019J2)
河南省重点研发与推广专项(科技攻关)项目(202102110113)。
关键词
Q235B
焊接
随机喷丸
残余应力
最优参数
数值模拟
Q235B
weld
random shot peening
residual stress
optimal parameters
numerical simulation
作者简介
邢家麒(1996-),男,硕士研究生,主要研究方向为表面强化;通讯作者:贺占蜀(1985-),男,博士,副教授,主要研究方向为抗疲劳制造与表面强化技术。
