Abstract
The strain gradient elasticity theory is applied to the solution of a mode III crack in an elastic layer sandwiched by two elastic layers of infinite thickness. The model includes volumetric and surface strain gradient characteristic length parameters. Both the near-tip asymptotic stresses and the crack displacement are obtained. Due to stain gradient effects, the magnitudes of the stress ahead of the crack tip are significantly higher than those in the classical linear elastic fracture mechanics. When the gradient parameters reduce to sufficiently small, all results reduce to the conventional linear elastic fracture mechanics results. In addition to the single crack in the finite layer, the solution and the results for two collinear cracks are also established and given.
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