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Residual stress measurement combining blind-hole drilling and digital image correlation approach
Journal of Constructional Steel Research ( IF 4.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jcsr.2020.106346
Yang Peng , Jun Zhao , Lan-shu Chen , Jun Dong

Abstract In this study, digital image correlation (DIC) combined with the hole-drilling method is used to measure residual stress in full-scale steel components. According to the displacements before and after drilling, the theoretical expressions of residual stress are derived. The finite element (FE) method is used to solve for the estimated coefficients, which provides the basis for the experiment. An H-shaped steel beam specimen is used in the benchmark experiment to verify the feasibility and reliability of the DIC-hole drilling method. Combining DIC with hole-drilling technology, the speckle image information and displacement fields of the specimen before and after hole-drilling are extracted. The residual stress is then calculated and compared with the results of theoretical calculations, and the causes of the differences are analysed. In order to strengthened the validation of the method, hole-drilling method is used here to make comparisons with DIC-hole drilling method. The results indicate that the DIC-hole drilling is a feasible and sufficiently accurate method for measuring the residual stress in full-scale steel components. The displacement field in the regions centred at a distance of 2–2.5 times the radius from the hole is proposed for the accurate measurement of the residual stress. The accuracy of the DIC-hole drilling method is sufficient for the measurement of high values of residual stress. When the measured residual stress σx > 100 MPa, the difference is about 10%.

中文翻译:

盲孔钻孔与数字图像相关法相结合的残余应力测量

摘要 本研究采用数字图像相关(DIC)结合钻孔法测量全尺寸钢构件的残余应力。根据钻孔前后的位移,推导出残余应力的理论表达式。采用有限元(FE)法求解估计系数,为实验提供依据。基准试验采用H型钢梁试件,验证了DIC钻孔方法的可行性和可靠性。将DIC与钻孔技术相结合,提取钻孔前后试样的散斑图像信息和位移场。然后计算残余应力并与理论计算结果进行比较,分析产生差异的原因。为了加强对方法的验证,这里采用钻孔法与DIC钻孔法进行比较。结果表明,DIC 钻孔是一种可行且足够准确的测量全尺寸钢部件残余应力的方法。中心距孔半径 2-2.5 倍的区域中的位移场被提议用于精确测量残余应力。DIC 钻孔方法的精度足以测量高残余应力值。当实测残余应力σx > 100 MPa时,相差约10%。结果表明,DIC 钻孔是一种可行且足够准确的测量全尺寸钢部件残余应力的方法。中心距孔半径 2-2.5 倍的区域中的位移场被提议用于精确测量残余应力。DIC 钻孔方法的精度足以测量高残余应力值。当实测残余应力σx > 100 MPa时,相差约10%。结果表明,DIC 钻孔是一种可行且足够准确的测量全尺寸钢部件残余应力的方法。中心距孔半径 2-2.5 倍的区域中的位移场被提议用于精确测量残余应力。DIC 钻孔方法的精度足以测量高残余应力值。当实测残余应力σx > 100 MPa时,相差约10%。DIC 钻孔方法的精度足以测量高残余应力值。当实测残余应力σx > 100 MPa时,相差约10%。DIC 钻孔方法的精度足以测量高残余应力值。当实测残余应力σx > 100 MPa时,相差约10%。
更新日期:2021-01-01
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