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基于激光散斑DIC技术的金属热应变原位测量研究
In-situ measurement of metal thermal strain based on laser speckle DIC technology
投稿时间:2023-02-06  修订日期:2023-04-01
DOI:
中文关键词:  激光散斑  数字图像相关法  原位测量  热应变测量
英文关键词:laser speckle  digital image correlation method  in-situ measurement  thermal strain measuremen
基金项目:科技部重点研发计划资助项目(No.2019YFE03080400);国家自然科学基金(11904007)
作者单位邮编
张吴记 安徽大学 230601
贺胜男* 安徽大学 230601
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中文摘要:
      基于激光散斑的数字图像相关(Digital Image Correlation, DIC)测量技术是通过长相干激光入射到金属壁面生成的激光散斑形成特征纹理,结合DIC计算变形前后散斑图像的相关性,实现对金属材料在特殊环境下(超高温等)的应变原位测量。初步研究发现,激光散斑图像的均匀性和稳定性对测量精度有较大影响。为了拓展该方法的适用条件,对激光器类型、波长、扩束系统、成像系统等进行了详细的设计、改进和测试,对比了改进前后的光学系统,获得了全视场范围分布更加均匀的散斑图像。同时利用该方法验证了金属铝在非真空环境下从室温加热到360℃的热应变测量,测量结果与理论值吻合较好,并随着温度的升高,测量结果的相对误差不断降低,证明了该方法在金属热应变检测中应用的可行性。
英文摘要:
      Digital Image Correlation (DIC) measurement technology based on laser speckle is to form characteristic texture through the laser speckle generated by the long phase coherent laser incident on the metal wall, and combine with DIC to calculate the correlation of the speckle image before and after deformation, so as to realize the in-situ measurement of the strain of metal materials in special environment (ultra-high temperature, etc.). The preliminary study found that the uniformity and stability of the laser speckle image have a great impact on the measurement accuracy. To expand the applicability of the method, the laser type, wavelength, beam extension system, imaging system, etc. were designed, improved, and tested in detail, and the optical systems before and after refinement were compared to obtain speckle images with more uniform distribution of the full field of view. This method is used to verify the thermal strain measurement of metal aluminum heated from room temperature to 360 ℃ in non-vacuum environment, the measured results are in good agreement with the theoretical values, and the relative error decreases with the increase of temperature. It is proved that the application of this method in metal thermal strain detection is feasible.
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