Crack front pinning by design in planar heterogeneous interfaces |
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Authors: | D Dalmas E Barthel |
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Institution: | a Unité Mixte CNRS/Saint-Gobain “Surface du Verre et Interfaces”, UMR 125, Saint-Gobain Recherche, BP 135, F-93303 Aubervilliers Cedex, France b Laboratoire PMMH, UMR 7636 CNRS/ESPCI/Paris 6/Paris 7, 10 rue Vauquelin, F-75231 Paris cedex 05, France |
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Abstract: | The propagation of an interfacial crack front along the weak plane of a thin film stack is considered. A simple patterning technique is used to create a toughness contrast within this perfectly two-dimensional weak interface. The transparency of the specimens allows us to directly observe the propagation of the purely planar crack obtained during a DCB (double cantilever beam) test. The effect on the crack front morphology of macroscopic unidimensional patterns in the direction of propagation is studied. In these weak pinning conditions, the geometry of the front quantitatively agrees with the first-order expansion proposed by Gao and Rice 1989. First-order perturbation analysis of crack trapping by arrays of obstacles. J. Appl. Mech. 56, 828-836] which accounts for the effect of the interfacial crack front geometry on the stress intensity factor. |
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Keywords: | 62 25Mm 62 20 mt 68 35 Gy |
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