| Summary: | 碩士 === 淡江大學 === 機械工程研究所 === 79 ===
The boundary element technique presented in this paper can be used to analyze the stress intensity factors for arbitrarily shaped cracks of two-dimensional linear elastic bodies. This technique is the method of subregions in essence. To deal with contact between crack surfaces, displacement and tractions along the crack surfaces are transformed into tangent and normal directions. Also, transition elements are placed next to the crack tip element in the interface for better accuracy. This technique can analyze very small cracks, and very good accuracy is obtained with ralatively fewer elements.
To demonstrate the validity of this method, straight, circular arc, kinked and Z-shaped cracks are analyzed. Crack surfaces can be in open, contact, slip or mixed conditions. In comparison with the pre-existing solutions, the stress intensity factors are in good agreement within 2%. Current research also studies crack propagation angles.
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