Numerical extrapolated method for calculating sif accurately

被引：0

作者：

Li, H. ^{[1
]}

Wu, X. ^{[1
]}

Yang, B. ^{[1
]}

机构：

[1] School of Civil Engineering, Hefei University of Technology, Hefei 230009, China

来源：

Journal of Mechanical Strength | 2001年 / 23卷 / 02期

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摘要：

The collapsed singular isoparametric element's method and a numerical extrapolated new method for calculating the stress intensity factor are introduced at first. Both methods use the collapsed singular quadratic isoparametric elements. The crack tip element size, type of structure and material's Poission ratio have a pronounced influence on accuracy of the tradition method. These defects are taken into account. So the different extrapolated technique is used in the new method. The marked difference between the extrapolated basis of both methods are discussed secondly. The theoretical basis of the numerical extrapolated method are proved with 3D crack problem. The theoretical error of both methods are evaluated. Better accuracy has been found for the numerical extrapolated method. The calculative error of both methods are discussed at last. The calculative error of FEM is considered by the numerical extrapolated method. The optimum size of crack tip element for different crack problems can be obtained fr om the new method.

引用

页码：209 / 212