| 基于断裂力学的数字相关技术残余应力检测方法 |
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| 引用本文： | 孙娟,张旦闻.基于断裂力学的数字相关技术残余应力检测方法[J].洛阳大学学报,2006,21(2):57-62. |
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| 作者姓名： | 孙娟 张旦闻 |
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| 作者单位： | 洛阳大学,机电工程学院,河南,洛阳,471023 |
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| 基金项目： | 国家自然科学基金资助项目（项目编号：50571035） |
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| 摘 要： | 提出一种简便的残余应力检测方法,利用数字相关技术检测裂纹扩展过程中试样表面的变形(COD),应用断裂力学理论计算出残余应力分布.通过梁弯曲对试验结果作了验证并与应变测量结果进行了对比,残余应力的检测结果与理论值标准差为1.28MPa.对淬火和焊接残余应力分别作了检测.实际应用表明所提出检测方法具有准确、高效和使用简便的特点.
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| 关 键 词： | 数字相关 残余应力 强度因子 COD |
| 文章编号： | 1007-113X（2006）02-0057-06 |
| 收稿时间： | 2006-02-20 |
| 修稿时间： | 2006年2月20日 |
A Method for the Measurement of Residual Stress by Digital Speckle Correlation Using a Fracture Mechanics Approach |
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| SUN Juan,ZHANG Dan-wen.A Method for the Measurement of Residual Stress by Digital Speckle Correlation Using a Fracture Mechanics Approach[J].Journal of Luoyang University,2006,21(2):57-62. |
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| Authors: | SUN Juan ZHANG Dan-wen |
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| Abstract: | A simple method for measuring residual stresses in a plate is described.In this method residual stresses were evaluated using a fracture mechanics approach,that is,the crack opening displacements(COD) measured by digital speckle correlation method(DSCM) at a point on the edge of a plate as a rack was introduced and extend from the edge were used to deduce the state of stresses that existed in uncracked plate.A bent beam,with a known stress profile,was used to validate the method and the results were well consistent with the result from FEM with 1.28 MPa deflection,which were show and compared favorably with the crack compliance method using strain gauge.The residual stresses existing in plate after quenching and welding processes were detected,respectively.The method was shown to be effective and easy-performing for the measurement of two-dimensional residual stress distribution. |
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| Keywords: | DSCM residual stress stress intensity factor COD |
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