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Structural Engineering and Mechanics   Volume 30, Number 3, October20 2008, pages 317-330
Variations of the stress intensity factors for a planar crack parallel to a bimaterial interface
Chunhui Xu, Taiyan Qin, Li Yuan and Nao-Aki Noda

Abstract     [Buy Article]
    Stress intensity factors for a planar crack parallel to a bimaterial interface are considered. The formulation leads to a system of hypersingular integral equations whose unknowns are three modes of
crack opening displacements. In the numerical analysis, the unknown displacement discontinuities are approximated by the products of the fundamental density functions and polynomials. The numerical
results show that the present method yields smooth variations of stress intensity factors along the crack front accurately. The mixed mode stress intensity factors are indicated in tables and figures with varying the shape of crack, distance from the interface, and elastic constants. It is found that the maximum stress intensity factors normalized by root area are always insensitive to the crack aspect ratio. They are given in a form of formula useful for engineering applications.
Key Words
    hypersingular integral equation; stress intensity factor; bimaterial; crack.
Chunhui Xu, Taiyan Qin and Li Yuan: College of Science, China Agricultural University, Beijing 100083, P.R. China
Nao-Aki Noda: Dept. of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu, 804-8550, Japan

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