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首页> 外文期刊>International Journal of Solids and Structures >3D effects on crack front core regions, stress intensity factors and crack initiation angles
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3D effects on crack front core regions, stress intensity factors and crack initiation angles

机译：3D对裂纹前核心区域，应力强度因子和裂纹萌生角度的影响

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摘要

Results pertaining to three dimensional finite element analysis of a mixed mode edge crack in a tension specimen are presented. Considering three values for the crack inclination angle, the effect of thickness is investigated on the predicted crack tip plastic zone size, stress intensity factors and crack initiation angles at the surface and the mid plane. The crack initiation angles are calculated using two crack initiation criteria: MTS and R-criterion. In general, the effect of thickness is noted for low values of thickness over crack length ratio at the surface. The finite element results are optimized through mesh convergence and validated by experiments. The experimental set up is designed and used to measure the crack initiation angle in mixed mode SENT specimen and estimate the stress intensity factors for different crack inclination angles and specimen thicknesses.
机译：提出了与拉伸试样中混合模式边缘裂纹的三维有限元分析有关的结果。考虑裂纹倾角的三个值，研究了厚度对预测的裂纹尖端塑性区大小，应力强度因子以及表面和中平面处的裂纹萌生角的影响。裂纹萌生角度是使用两个裂纹萌生标准计算的：MTS和R-准则。通常，厚度的影响是由于表面的裂纹长度之比与厚度的较低值有关。通过网格收敛优化了有限元结果，并通过实验进行了验证。设计了实验装置，用于测量混合模式SENT试样的裂纹萌生角，并估算不同裂纹倾角和试样厚度的应力强度因子。

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