摘要
【目的】为了研究初始形貌对激光冲击和喷丸强化下靶材深度方向上残余压应力的影响。【方法】利用有限元软件建立20Cr_(2)Ni_(4)齿轮钢复合强化有限元模型,并在不同初始形貌状态前提下对该模型表面分别进行了激光冲击、喷丸及复合强化的仿真分析。【结果】结果表明,随着初始表面粗糙度的增加,喷丸强化下靶材深度方向上的峰值残余压应力和层深均有所降低;相较于喷丸,激光冲击强化下靶材应力层深没有显著的变化;在复合强化中,靶材深度方向上残余压应力的分布表现出明显的分段组合特征,且靶材深度方向上的压应力层深可以达到喷丸的3倍,峰值残余压应力可以达到激光冲击强化的2倍;相较于激光冲击强化,复合强化后靶材内部应力层深由0.42 mm降低到0.36 mm,降幅14.3%。此外,复合强化可以获得更高的峰值残余压应力,削弱初始粗糙表面对峰值残余压应力的影响。
[Objective]The influence of the initial surface topography on the residual compressive stress distribution along the depth direction of targets under laser shock peening(LSP)and shot peening(SP)processes was investigated.[Methods]A finite element model for the composite strengthening of 20Cr_(2)Ni_(4) gear steel was established using the finite element software.Simulation analyses were conducted on the surface of this model for laser shock peening,shot peening,and composite strengthening respectively under different initial topographical conditions.[Results]The results indicate that,with the increase of initial surface roughness,the peak residual compressive stress and stress layer depth along the depth direction of the target decrease under SP.In contrast,no significant variation in the stress layer depth under LSP is found.Under combined the strengthening,the residual compressive stress distribution shows distinctive segmented combination characteristics along the depth direction.Notably,the depth of the compressive stress layer is reached to three times that of SP,and the peak residual compressive stress is doubled compared to LSP.Compared to LSP alone,the internal stress layer depth is decreased from 0.42 mm to 0.36 mm(a 14.3%reduction)after the combined strengthening.Additionally,higher peak residual compressive stress is achieved and the adverse effects of initial surface roughness on stress distribution are mitigated by the combined strengthening.
作者
何国旗
谢远昊
何瑛
邹思敏
吴旭
彭凌杰
罗嘉强
HE Guoqi;XIE Yuanhao;HE Ying;ZOU Simin;WU Xu;PENG Lingjie;LUO Jiaqiang(School of Mechanical Engineering,Hunan University of Technology,Zhuzhou 412007,China;Zhuzhou Ruidel Intelligent Equipment Co.,Ltd.,Zhuzhou 412007,China;School of Intelligent Manufacturing,Hunan Vocational Institute of Technology,Xiangtan 411104,China)
出处
《机械传动》
北大核心
2025年第5期101-108,共8页
Journal of Mechanical Transmission
基金
湖南省重点研发计划项目(2023GK2097)
湖南省自然科学基金省市联合基金项目(2021JJ50033,2021JJ50020)
国家自然科学基金面上项目(52475055)。
关键词
激光冲击强化
喷丸强化
残余应力
数值模拟
复合强化
Laser shock peening
Shot peening
Residual stress
Numerical simulation
Compound strengthening
