The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Yi-shyong Ing - One of the best experts on this subject based on the ideXlab platform.
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DYNAMIC ANALYSIS OF A PROPAGATING ANTIPLANE INTERFace Crack
Journal of Engineering Mechanics, 1997Co-Authors: Yi-shyong IngAbstract:In this study, the transient problem of a propagating interFace Crack between two different media is analyzed. For time t< 0, the Crack is stress free and at rest. At t= 0, a pair of concentrated antiplane dynamic point loadings are applied at the stationary Crack Faces. It is assumed that the stationary Crack will begin to propagate along the interFace with a subsonic speed as the incident wave generated by the point loading in the upper Crack Face or in the Lower Crack Face arrives at the Crack tip. A new fundamental solution is proposed in this study and the transient solution is determined by superposition of the fundamental solution in the Laplace transform domain. The proposed fundamental problem is the problem of applying an exponentially distributed traction (in the Laplace transform domain) on the propagating Crack Faces. The Cagniard-de Hoop method of Laplace inversion is used to obtain the transient solution in time domain. Theoretical results indicate that the shear stress along the interFace ...
Yi-heng Chen - One of the best experts on this subject based on the ideXlab platform.
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T-stress of an interFace macroCrack induced by near tip subinterFace microCracks
International Journal of Fracture, 1998Co-Authors: Liguo Zhao, Yi-heng ChenAbstract:Determination of the T-stress of an interFace macroCrack induced by near tip subinterFace microCracks is performed. Based on the general solution of the macro-microCrack interaction, the induced T-stress can be evaluated by using the principle of superposition. Numerical examples of an interFace macroCrack interacting with a single near tip subinterFace microCrack are considered and the results are shown graphically. The induced T-stress is shown to be significantly dependent on the location and orientation of the near tip microCrack. The induced T-stresses of the upper Crack Face (Δ T+) and the Lower Crack Face (Δ T-) are different. The difference disappears only when the microCrack is located and oriented definitely, for which both Δ T+ and Δ T- become zero. Δ T+ and Δ T- have the same sign, i.e., simultaneously positive or negative. The positive or negative value is dependent on the location and orientation of the microCrack.
Liguo Zhao - One of the best experts on this subject based on the ideXlab platform.
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T-stress of an interFace macroCrack induced by near tip subinterFace microCracks
International Journal of Fracture, 1998Co-Authors: Liguo Zhao, Yi-heng ChenAbstract:Determination of the T-stress of an interFace macroCrack induced by near tip subinterFace microCracks is performed. Based on the general solution of the macro-microCrack interaction, the induced T-stress can be evaluated by using the principle of superposition. Numerical examples of an interFace macroCrack interacting with a single near tip subinterFace microCrack are considered and the results are shown graphically. The induced T-stress is shown to be significantly dependent on the location and orientation of the near tip microCrack. The induced T-stresses of the upper Crack Face (Δ T+) and the Lower Crack Face (Δ T-) are different. The difference disappears only when the microCrack is located and oriented definitely, for which both Δ T+ and Δ T- become zero. Δ T+ and Δ T- have the same sign, i.e., simultaneously positive or negative. The positive or negative value is dependent on the location and orientation of the microCrack.
A. Dorogoy - One of the best experts on this subject based on the ideXlab platform.
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Shear–compression loaded interFace Crack between a rigid substrate and an FGM layer—frictional Crack closure effects
International Journal of Fracture, 2019Co-Authors: A. DorogoyAbstract:A typical application of functionally graded materials (FGMs) is the coating of homogeneous or inhomogeneous substrates. This work investigates numerically an interfacial Crack between an FGM coating and a rigid substrate that is subjected to shear–compression loading under the effect of friction. Two types of linearly graded coatings and one homogeneous coating exhibiting the same average Young’s modulus were examined. Two different numerical methods were applied for solving the singular receding contact problem: in-house finite difference software and a commercial finite element software. The effect of friction on the Crack closure parameters such as tangential shifts and normal gaps of the Crack Face were studied with both methods and revealed an excellent agreement between the two. The effect of friction on the transition of the Crack Face from the slip to stick condition was studied as well. An extended J line formulation was used to extract the stress intensity factors (SIFs) for the Crack tip for which the adjacent Crack Face experiences a large frictional contact. It was demonstrated that increasing the coefficient of friction causes a decrease in the tangential shifts and normal gaps until the whole Crack Face exhibits stick. The linear gradation in which the material is harder on the interFace than on the top results in Lower Crack Face displacement and SIFs.
Emmanuel E. Gdoutos - One of the best experts on this subject based on the ideXlab platform.
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Path Independent Integrals
Problems of Fracture Mechanics and Fatigue, 2003Co-Authors: Emmanuel E. GdoutosAbstract:Consider a Crack in a mixed-mode stress field governed by the values of stress intensity factors KI and KII. Calculate the path-independent line integral (1) where Г is a path described counterclockwise starting from a point on the Lower Crack Face and terminating at a point on the upper Crack Face.
