| 表面曲率对激光冲击曲面材料表面残余应力场分布的影响 |
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| 引用本文： | 葛良辰,曹宇鹏,花国然,王帅,张悦,曹晨.表面曲率对激光冲击曲面材料表面残余应力场分布的影响[J].表面技术,2020,49(4):284-291. |
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| 作者姓名： | 葛良辰 曹宇鹏 花国然 王帅 张悦 曹晨 |
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| 作者单位： | 南通大学 机械工程学院，江苏 南通 226019,南通大学 机械工程学院，江苏 南通 226019,南通大学 机械工程学院，江苏 南通 226019,南通大学 机械工程学院，江苏 南通 226019,南通大学 机械工程学院，江苏 南通 226019,南通大学 机械工程学院，江苏 南通 226019 |
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| 基金项目： | 国家自然科学基金（51505236，51579118）；江苏省研究生科研创新计划（KYCX18_2417）；中国博士后科学基金面上项目（2019M651931）；江苏省产学研合作项目（BY2018323）；南通市基础科学研究项目（JC2018029）；江苏省3D打印装备及应用技术重点建设实验室开放基金项目（2018KFKT10） |
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| 摘 要： | 目的针对曲面材料在激光冲击作用下,表面曲率对激光冲击波传播存在影响,使其残余应力场分布情况不同于平面,分析其形成机理。方法将研究对象设置为凸模型,借助有限元软件ABAQUS,模拟了1500MPa冲击压力下,激光冲击波分别加载1/5、1/10、1/15曲率的7050铝合金试样。设置相应的平面试样作为对照组,并采用相同参数条件进行实验验证。结果当曲率为1/5时,冲击后的材料表面残余应力场分布不均匀,在母线方向的光斑边缘处,残余压应力仅为-237.0 MPa,塑性应变层深为0.5878μm;在圆周方向的光斑边缘处残余压应力为-258.5 MPa,较母线方向增加9.07%,塑性应变层深达到1.235μm,较母线方向增加110.11%。这一现象随着曲率的减小而逐渐消失,当曲率小于1/15时,表面残余应力场分布近似平面。结论激光冲击凸模型时,表面残余压应力场分布存在偏向现象,即试样沿母线方向的残余压应力值小于圆周方向,其对应的塑性应变深度也呈相同的规律。
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| 关 键 词： | 激光冲击 表面强化 残余应力 曲率 仿真模拟 |
| 收稿时间： | 2019/7/9 0:00:00 |
| 修稿时间： | 2020/4/20 0:00:00 |
The Effect of Surface Curvature on Surface Residual Stress Field Distribution of Laser Shock Materials |
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| GE Liang-chen,CAO Yu-peng,HUA Guo-ran,WANG Shuai,ZHANG Yue and CAO Chen.The Effect of Surface Curvature on Surface Residual Stress Field Distribution of Laser Shock Materials[J].Surface Technology,2020,49(4):284-291. |
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| Authors: | GE Liang-chen CAO Yu-peng HUA Guo-ran WANG Shuai ZHANG Yue and CAO Chen |
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| Affiliation: | School of Mechanical Engineering, Nantong University, Nantong 226019, China,School of Mechanical Engineering, Nantong University, Nantong 226019, China,School of Mechanical Engineering, Nantong University, Nantong 226019, China,School of Mechanical Engineering, Nantong University, Nantong 226019, China,School of Mechanical Engineering, Nantong University, Nantong 226019, China and School of Mechanical Engineering, Nantong University, Nantong 226019, China |
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| Abstract: | The work aims to make the distribution of residual stress field different from that of plane and analyze its formation mechanism,aiming at the influence of surface curvature on laser shock wave propagation in the curved surface materials.Convex model was taken as the study object.With the help of finite element software ABAQUS,7050 aluminum alloy specimens with 1/5,1/10 and 1/15 curvatures were loaded by laser shock wave under 1500 MPa shock pressure.The corresponding plane specimens were set as control group,and the same parameters were used for experimental verification.When the curvature was 1/5,the distribution of residual stress field on the impact material surface was not uniform.At the edge of the spot in the bus direction,the residual compressive stress was only?237.0 MPa,and the plastic strain layer depth was 0.5878μm.The residual compressive stress at the edge of the circular spot was?258.5 MPa,which was 9.07%higher than that of bus direction,and the depth of plastic strain layer reached 1.235μm,which was 110.11%higher than that of bus direction.This phenomenon gradually disappeared with the decrease of curvature.When the curvature was less than 1/15,the distribution of surface residual stress field was approximately that of plane specimen.In the convex model subject to laser shock,the distribution of residual compressive stress field on the surface is biased,that is,the residual compressive stress value in the bus direction is less than that in the circumferential direction,and the corresponding plastic strain depth is consist with this result. |
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| Keywords: | laser shock surface strengthening residual stress curvature simulation |
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