The inverse-deformation approach to fracture
The inverse-deformation approach to fracture
复制标题
断裂的逆变形方法
DOI:
10.1016/j.jmps.2021.104352
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发表时间:
2021
影响因子:
5.3
通讯作者:
Alyanak, Uğur
中科院分区:
文献类型:
--
作者:
Rosakis, Phoebus;Healey, Timothy J.;Alyanak, Uğur
We propose a one-dimensional, nonconvex elastic constitutive model with higher gradients that can predict spontaneous fracture at a critical load via a bifurcation analysis. It overcomes the problem of discontinuous deformations without additional field variables, such as damage or phase-field variables, and without a priori specified surface energy. Our main tool is the inverse deformation, which can be extended to be a piecewise smooth mapping even when the original deformation has discontinuities describing cracks opening. We exploit this via the inverse-deformation formulation of finite elasticity due to Shield and Carlson, including higher gradients in the energy. The problem is amenable to a rigorous global bifurcation analysis in the presence of a unilateral constraint. Fracture under hard loading occurs on a bifurcating solution branch at a critical applied stretch level, with a sudden drop to zero stress. Fractured solutions are found to have sharply defined cracks with surface energy arising from higher gradient effects.
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1997
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