Impact behavior of an inclined edge crack in a layered medium with a graded nonhomogeneous interfacial zone: antiplane deformation |
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Authors: | H J Choi |
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Affiliation: | (1) School of Mechanical and Automotive Engineering, Kookmin University, 861-1 Chongnung-dong, Songbuk-gu, Seoul, 136-702, Republic of Korea |
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Abstract: | Summary The impact response of an inclined edge crack in a layered medium with a functionally graded interfacial zone is investigated
under the state of antiplane deformation. The interfacial zone is modeled by a nonhomogeneous interlayer having the power-law
variations of shear modulus and mass density between the coating and the substrate of dissimilar homogeneous properties. Based
on the Laplace and Fourier integral transform technique and the coordinate transformations of basic field variables, the transient
crack problem is reduced to the solution of a singular integral equation with a generalized Cauchy kernel in the Laplace transform
domain. The crack-tip response in the physical domain is recovered through the inverse Laplace transform to evaluate the dynamic
mode III stress intensity factors as functions of time. The peak values of the dynamic stress intensity factors are further
obtained versus the crack orientation angle, addressing the effects of crack obliquity on the overshoot characteristics of
the transient crack-tip behavior for various combinations of material and geometric parameters of the layered medium. |
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Keywords: | |
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