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论文:2019,Vol:37,Issue(4):643-649 |
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引用本文： |
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杜永, 马玉娥, 苟磊, 郭超, 李博, 李钢. 激光强化后7050凹槽铝板的残余应力分布规律研究[J]. 西北工业大学学报 |
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DU Yong, MA Yu'e, GOU Lei, GUO Chao, LI Bo, LI Gang. Study on Residual Stress Distribution of 7050 Aluminum Sheet with Groove after Laser Shock Peening[J]. Northwestern polytechnical university |
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| 激光强化后7050凹槽铝板的残余应力分布规律研究 |
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| 杜永1, 马玉娥1, 苟磊1, 郭超2, 李博2, 李钢2 |
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1. 西北工业大学 航空学院, 陕西 西安 710072;
2. 航空工业第一飞机设计研究院, 陕西 西安 710089 |
| 摘要: |
| 为了研究激光冲击强化后7050-T7451凹槽铝板残余应力场分布，测量了冲击后凹槽的残余应力分布规律：从凹槽中心到凹槽边缘，残余应力逐渐减小；在凹槽边缘底边处取最小值；然后沿凹槽边缘上升而增大，表面残余应力在凹槽曲面底边处取到最小值。采用ABAQUS有限元软件建立凹槽铝板的三维有限元模型，利用VDLOAD子程序施加载荷，进行数值分析得到了激光喷丸后残余应力分布并与试验测量结果对比，符合较好；然后研究了不同激光参数对凹槽铝板残余应力场的影响规律。结果表明：随着激光功率密度从0.84 GW/cm2增加到5.29 GW/cm2，残余应力先减小后增加，激光功率密度为3.06 GW/cm2时达到最小值-230 MPa；随着光斑直径从4 mm增加到6 mm，残余应力由-214 MPa增加至-30 MPa；随着激光脉宽从10 ns增加到40 ns，残余应力由-21 MPa减小至-288 MPa，残余压应力层深度逐渐增加；表面残余应力的最小值在凹槽曲面处取得。 |
| 关键词:
激光强化
7050-T7451铝板
凹槽
残余应力
激光强化参数
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| Study on Residual Stress Distribution of 7050 Aluminum Sheet with Groove after Laser Shock Peening |
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| DU Yong1, MA Yu'e1, GOU Lei1, GUO Chao2, LI Bo2, LI Gang2 |
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1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. AVIC The First Aircraft Institute, Xi'an 710089, China |
| Abstract: |
| In order to study the residual stress profile of 7050-T7451 aluminum sheet with groove after laser shock peening (LSP), the residual stress distribution was measured. It is shown that the residual stress decreases gradually from the center to the edge of groove; and then there is the minimum value at the edge of the groove bottom surface. By using ABAQUS software to establish three-dimensional finite element model for 7050 aluminum sheet with groove, and the load was applied by VDLOAD subroutine. The finite element analysis was performed and the analysis results were compared with the experimental measurements, in which the both the results agree with each other very well. And then the residual stress distribution of the sheet was analyzed after laser shock peening under different laser processing parameters. It is shown that the residual stress decreases firstly and then increases with the rise of laser power density from 0.84 GW/cm2 to 5.29 GW/cm2. And the residual stress obtains the minimum value -230 MPa at the laser power density of 3.06 GW/cm2. With the increasing of spot diameter from 4 mm to 6 mm, the residual stress increased from -214 MPa to -30 MPa. With the increasing of laser pulse width from 10 ns to 40 ns, the residual stress decreased from -21 MPa to -288 MPa; and the depth of the compressive residual stress increased too. For all simulations under different LSP parameters, the minimum surface residual stress achieved at the bottom surface of the groove as well. |
| Key words:
laser shock peening
7050-T7451 aluminum sheet
groove
residual stress
processing parameters
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| 收稿日期: 2018-09-12
修回日期:
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| DOI: 10.1051/jnwpu/20193740643 |
| 基金项目: 国家自然科学基金（11572250）资助 |
| 通讯作者: 马玉娥(1975-),女,西北工业大学教授,主要从事复合材料结构力学和强度研究。E-mail:ma.yu.e@nwpu.edu.cn
Email：ma.yu.e@nwpu.edu.cn |
| 作者简介: 杜永(1992-),西北工业大学博士研究生,主要从事复合材料结构力学和结构强度研究。
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| 作者相关文章 |
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| 杜永 在本刊中的所有文章 |
| 马玉娥 在本刊中的所有文章 |
| 苟磊 在本刊中的所有文章 |
| 郭超 在本刊中的所有文章 |
| 李博 在本刊中的所有文章 |
| 李钢 在本刊中的所有文章 |
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