On the transformation toughening of a crack along an interface between a shape memory alloy and an isotropic medium |
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Authors: | Yuval Freed Leslie Banks-Sills Jacob Aboudi |
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Institution: | The Dreszer Fracture Mechanics Laboratory, School of Mechanical Engineering, The Fleischman Faculty of Engineering, Tel Aviv University, 69978 Ramat Aviv, Israel |
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Abstract: | In this study, a bilinear cohesive zone model is employed to describe the transformation toughening behavior of a slowly propagating crack along an interface between a shape memory alloy and a linear elastic or elasto-plastic isotropic material. Small scale transformation zones and plane strain conditions are assumed. The crack growth is numerically simulated within a finite element scheme and its transformation toughening is obtained by means of resistance curves. It is found that the choice of the cohesive strength t0 and the stress intensity factor phase angle φ greatly influence the toughening behavior of the bimaterial. The presented methodology is generalized for the case of an interface crack between a fiber reinforced shape memory alloy composite and a linear elastic, isotropic material. The effect of the cohesive strength t0, as well as the fiber volume fraction are examined. |
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Keywords: | Phase transformation Fracture mechanisms Delamination Finite elements Shape memory alloys |
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