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- W1986603940 abstract "Abstract Machining of a material surface often produces large shear stress beneath the free surface, which causes dislocations piled up along a slip plane near the surface until those dislocations are stopped by an obstacle and nucleates a microcrack at the subsurface. The nucleated microcrack due to dislocation pile-up is called a Zener–Stroh crack which has many properties different to a conventional Griffith crack. In this paper, the physical mechanism of such microcrack initiation has been discussed. Stress investigation on the problem of a subsurface Zener–Stroh crack inclined to the free surface of a material has been carried out. By using the stress solution of a single dislocation in a half plane as the Green's function, the microcrack is simulated with distributed dislocations along the crack line. A set of singular integral equations are then formulated and solved with numerical method. Results show that the influence of the free surface on the stress intensity factors (SIFs) of the crack and the critical crack length greatly depends on the slant angle. The free surface also brings intrinsic coupling phenomenon for the Mode I and Mode II SIFs. As a result this coupling effect changes the fracture toughness of the material." @default.
- W1986603940 created "2016-06-24" @default.
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- W1986603940 date "2004-10-01" @default.
- W1986603940 modified "2023-09-27" @default.
- W1986603940 title "An inclined Zener–Stroh crack near a free surface" @default.
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- W1986603940 doi "https://doi.org/10.1016/j.ijsolstr.2004.04.040" @default.
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