University of Cambridge > Talks.cam > Engineering Department Bio- and Micromechanics Seminars > Crack front instability in mode i+iii: experimental and theoretical approaches

Crack front instability in mode i+iii: experimental and theoretical approaches

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Experimental observations of crack front instability in mode I+III are first recalled. A theoretical linear stability analysis of the phenomenon is then presented. This analysis relies on (i) formulae providing the exact first-order expression of the local stress intensity factors along the front, after from some arbitrary perturbation of the surface and front of the crack; and (ii) a double criterion combining a Griffith-like condition and Goldstein and Salganik’s principle of local symmetry. It is shown that the coplanar configuration of the crack is unstable when the ratio of the mode III to mode I unperturbed stress intensity factors exceeds a certain threshold depending on Poisson’s ratio.

This talk is part of the Engineering Department Bio- and Micromechanics Seminars series.

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