裂纹尖端半径曲率对应力的影响

Y. A. Gerber, A. Nagel, M. Tabanyukhova
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引用次数: 0

摘要

在实验力学中,在进行模型研究时,经常会出现这样的问题:用切割代替裂纹是否合理,切割的曲率半径是否会对其顶点附近的应力大小产生很大影响。为了了解这些问题并给出答案,我们对压电光学材料(E2级有机玻璃)的样品进行了大量的实验。在模型中,用一个切口来模拟裂缝,然后用钻头在切口的顶部打一个洞。用光弹性方法对纯弯曲模型进行了研究。获得了两批样品在不同载荷下的应力场。利用实验数据,测定了不同曲率半径下裂纹切割附近的应力强度。对裂纹切割尖端半径曲率对其附近应力大小的影响进行了评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INFLUENCE OF CURVATURE OF THE CRACK TIP RADIUS ON STRESSES
In experimental mechanics, when conducting research on models, the question often arises of whether it is legitimate to replace a crack with a cut, whether the radius of curvature of the cut will have a large effect on the magnitude of stresses near its apex. In order to understand these questions and give answers to them, a number of experiments were carried out on samples made of piezo-optical material (Plexiglass of E2 grade). In the models, the crack was simulated using a cut, then a hole was made at the top of the cut with a drill. The models were investigated in pure bending by the photoelasticity method. Stress fields were obtained in two batches of samples at different loads. The intensity of stresses near cracks-cuts at different radius of curvature of their tops was determined by using the experimental data. An assessment ofthe influence of the crack-cut tip radius curvature on the magnitude of stresses near it has been carried out.
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