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| 基于数字图像相关法的链环残余应力测量 |
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林烈雄1, 陆皓1,2, 徐济进1, 程哲闻1
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1.上海交通大学 材料科学与工程学院, 上海 200240;2.上海交通大学 上海市激光制造中心与材料改性重点实验室, 上海 200240
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| 摘要: |
| 基于数字图像相关法搭建了一套应力测量系统，分析了散斑图质量对测量精度的影响，通过面内平移试验和平面应力状态试验验证该测量系统的准确性.结果表明，测量精度会随散斑图质量的提高有一定程度的提高.面内平移试验结果的相对误差都在3.5%以内，表明该系统具有较高的精度.平面应力状态试验的结果表明，使用该系统测量试样应力具有较高的准确度.将该测量系统应用于测量链环焊接残余应力，测量结果与使用应变片测得的结果基本一致.该应力测量系统操作简单、精度较高，可用于特定条件下代替应变片进行残余应力测量. |
| 关键词: 数字图像相关法 焊接残余应力 面内平移 平面应力 链环 |
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| 基金项目:重大专项（2012ZX04010-091）；国家自然科学基金资助项目（51405297，51575347，51204107） |
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| Measuring residual stress of chain based on the method of digital image correlation |
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LIN Liexiong1, LU Hao1,2, XU Jijin1, CHENG Zhewen1
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1.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China
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| Abstract: |
| A stress measurement system was built based on digital image correlation method. The influence of speckle pattern quality on the measurement accuracy was analyzed, and the accuracy of this measurement system was verified through in-plane translation and the test of plane stress state. The results show that the measurement accuracy can be improved with the increase of the quality of speckle pattern to a certain extent. All the relative errors in the test of in-plane translation were less than 3.5%, which indicate that the system has high accuracy. When this measurement system was used to measure the welding residual stress of the chain, the results are basically the same with that from strain gauges. It's worth noting that, this stress measurement system has advantages such as simple operation and high accuracy, which can be used to measure the residual stress instead of strain gauge under certain conditions. |
| Key words: digital image correlation welding residual stress in-plane translation plane stress chain |
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