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首页> 外文会议>European Conference on Fracture >Determination of Stress Intensity factors in Sharp Corners by Shearography Experimental Technique and Comparison of Results with Numerical and Analytical Solution
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Determination of Stress Intensity factors in Sharp Corners by Shearography Experimental Technique and Comparison of Results with Numerical and Analytical Solution

机译：剪切实验技术确定尖角应力强度因子及数值和解析解的比较

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摘要

In the current paper, Stress Intensity Factors have been determined for a specimen with crack in the sharp corner under tensile load by digital shearography technique. The solution used to measure these SIFs is the combination of shearography optical relations and fracture mechanics relationships. Using the mentioned optical technique, inplane strains based on the obtained frings are calculated in loaded specimen and then related to the Stress Intensity Factors. To reduce errors in SIFs measurement, the Least Squares method has been used. In order to verify the obtained results accuracy, the experimental results were compared with the results of finite element method and analytical results. Obviously, the analytical solution is not available for all states, it is just available for the state that the crack makes angle of 90° along with loading. The average rate of difference between experimental and numerical results is 15/54 percent and the average rate of difference between analytical and experimental results is 19/93 percent that the main reasons include the use of laser with non-Gaussian distribution, the use of no piezo element to precise determining of points phases, loading device limitation for sample with width greater than 140 mm and error in precise determining coordinates of the crack tip.
机译：在当前的论文中，已经通过数字剪切技术确定了在拉伸载荷下锐角拐角处有裂纹的试样的应力强度因子。用于测量这些SIF的解决方案是将剪切光学关系与断裂力学关系结合起来。使用所提到的光学技术，在加载的样本中计算基于获得的条纹的面内应变，然后将其与应力强度因子相关。为了减少SIF测量中的误差，已使用最小二乘法。为了验证所获得的结果的准确性，将实验结果与有限元方法的结果和分析结果进行了比较。显然，并非在所有状态下都可以使用解析解，只是在裂纹与载荷成90°角的状态下才可以使用。实验和数值结果之间的平均差异率为15/54％，分析结果和实验结果之间的平均差异率为19/93％，主要原因是使用非高斯分布的激光，不使用高斯分布的激光。用于精确确定点相位的压电元件，宽度大于140毫米的样品的加载装置限制以及精确确定裂纹尖端坐标的误差。

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