Determination of Highly Accurate Values of Stress Intensity Factor in a Plate of Arbitrary Form by FEM.
Determination of Highly Accurate Values of Stress Intensity Factor in a Plate of Arbitrary Form by FEM.
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利用有限元法确定任意形状板中应力强度因子的高精度值。
DOI：
10.1299/kikaia.65.2032
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
H. Nisitani
中科院分区：
文献类型：
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作者：
T. Teranishi;H. Nisitani
FEM 对于应力分析很有用，并且广泛使用。然而，通过有限元法获得高精度的应力强度因子值仍然不一定容易。最近，Nisitani 基于有限元计算裂纹尖端应力值的实用性，提出了一种计算高精度 I 型应力强度因子值的方法。虽然有限元法得到的裂纹尖端应力值是有限的，但它作为裂纹尖端奇异应力场的测量是非常有效的。在这项研究中，将该方法扩展到一般的二维裂纹问题。将扩展方法应用于倾斜裂纹、条带中两条裂纹的干涉以及有限板中的微裂纹问题。结果表明，本方法对于所有这些问题都具有足够的精度。
FEM is useful for stress analysis and used widely in general. However, it is still not necessarily easy to obtain the highly accurate values of stress intensity factors by FEM. Recently, a method for calculating the highly accurate values of mode I stress intensity factors is proposed by Nisitani, based on the usefulness of the stress values at a crack tip calculated by FEM. Although the stress value at a crack tip by FEM is finite, it is very effective as a measure of the singular stress field of the crack tip. In this study, an extension of this method to general two dimensional crack problems was made. The extended method was applied to the problems of the inclined crack, the interference of two cracks in a strip and the micro-crack in a finite plate. As the results, it was confirmed that the present method has the sufficient accuracy in all these problems.