Abstract
In a loaded cracked body the stress intensity factor K measures the strength of the singular term of the elastic solution of the stress field. In brittle materials, a crack propagates when the applied stress intensity factor KA reaches a critical value KIC which is a material’s characteristic called toughness. On the contrary, complete relaxation in plastic materials like FCC metals should lead to the immediate disappearance of the singular solution in r-1/2, i.e. to an effective stress intensity factor KE equal to zero, where KE is KA decreased to zero by plasticity.
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Michot, G., Azzouzi, H., Maloufi, N., de Oliveira, M.A.L., Scandian, C., George, A. (2000). Possible Mechanisms for Dislocations Multiplication at, or Close to, a Crack Tip. In: Lépinoux, J., Mazière, D., Pontikis, V., Saada, G. (eds) Multiscale Phenomena in Plasticity: From Experiments to Phenomenology, Modelling and Materials Engineering. NATO Science Series, vol 367. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4048-5_9
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