Crack front curvature effect on stress intensity factor of through and part-through thickness cracks |
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Authors: | YY Zhang D Xiao H Zhang |
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Affiliation: | Department of Engineering Mechanics, Shanghai Jiaotong University, Shanghai, 200030, China |
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Abstract: | The character of the local stresses and displacements are determined for a through crack with finite radius of curvature in a finite thickness plate. Numerical results obtained from the boundary element method show that the solutions are sufficiently accurate for /a ≤ 0.03 and 0.03 ≤ /a ≤ 0.1, where and a represent, respectively, the crack front radius of curvature and crack dimension such that a is the width of a through thickness crack and the depth of a part-through crack. For /a ≤ 0.1, the asymptotic singular stress field dominates such that the Mode I stress intensity factor K1 can be evaluated. As the crack border radius of curvature is increased for /a ≥ 0.1, the non-singular terms become significant such that KI would no longer dominate. Other failure criteria would have to be invoked to address fracture initiation. |
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