激光喷丸强化IN718合金孔周表面残余主应力分布特性

发布时间：2018-03-04 05:37

本文选题：激光光学　切入点：激光喷丸强化　出处：《中国激光》2017年02期 　论文类型：期刊论文

【摘要】：采用Abaqus软件建立有限元模型,分析了激光功率密度对孔周表面残余主应力分布的影响。进行了不同功率密度下的激光喷丸(LP)试验,通过X射线应力分析仪测量了孔周区域特征点三个方向的残余应力值,并计算了各点对应的主应力。结果表明,LP之后孔周的残余应力呈现各向异性;最小残余主应力可有效表征喷丸强化效果,随着激光功率密度的提高,最小残余主应力值减小。另外,LP后小孔附近出现典型的残余压应力环,最小残余主应力明显小于其他喷丸区域的;当功率密度超过一定阈值时,此环呈现远离孔壁的趋势。
[Abstract]:The influence of laser power density on the distribution of residual principal stress on the surface around the hole was analyzed by using the finite element model established by Abaqus software. The laser shot peening test was carried out at different power density. The residual stress values in three directions of characteristic points in the zone around holes were measured by X-ray stress analyzer, and the corresponding principal stresses were calculated. The results show that the residual stresses around the pores are anisotropic after LP. The minimum residual principal stress can effectively characterize the strengthening effect of shot peening. With the increase of laser power density, the minimum residual principal stress value decreases. In addition, a typical residual compressive stress ring appears near the small hole after LP. The minimum residual principal stress is obviously smaller than that of other shot peening regions, and when the power density exceeds a certain threshold, the ring appears to be far away from the hole wall.
【作者单位】：江苏大学机械工程学院;
【基金】：国家自然科学基金(51405204) 中国博士后科学基金(2013M540417,2014T70477) 江苏省博士后科研资助项目(1401065B) 江苏省大型工程装备检测与控制重点建设实验室开放课题(JSKLEDC201503) 江苏大学高级人才启动基金(13JDG109);江苏大学"青年骨干教师培养工程"资助项目(2016016);江苏大学大学生科研立项资助项目(15A042)
【分类号】：TG668;TN249

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