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• W2950306557 startingPage "663" @default.
• W2950306557 abstract "Abstract A block coordinate descent algorithm within a discontinuous Galerkin finite element formulation is proposed for both explicit and implicit energy minimization in solid bodies in which rigid-cohesive fractures initiate and propagate. The crack opening dependent Barenblatt type surface cohesive energy function is non-differentiable at the origin. In each iteration or each explicit update, the algorithm minimizes the potential with respect to each crack opening displacement unknown and with respect to the block of deformation unknowns, sequentially. This decomposes minimization of the full non-differentiable problem into a number of “small” non-differentiable sub-problems that must be solved locally at the inter-element boundaries of the finite element mesh and an “easy” differentiable sub-problem that characterizes global equilibrium. As a result, non-differentiability is effectively treated locally and the algorithm can be easily incorporated into standard finite element codes. On the basis of a convexity analysis of the proposed non-differentiable energy functional, we obtain a minimum cohesive process zone resolution criterion, known empirically in the previous literature as a requirement for capturing the amount of dissipated fracture energy correctly. The method is free of any regularization parameters and preserves the discrete nature of fracture without introducing a stress discontinuity at initiation of decohesion. Robustness of the method is shown through several numerical examples of fragmentation and branching and through comparisons with existing numerical and experimental results." @default.
• W2950306557 created "2019-06-27" @default.
• W2950306557 creator A5053407434 @default.
• W2950306557 creator A5090732274 @default.
• W2950306557 date "2019-09-01" @default.
• W2950306557 modified "2023-10-17" @default.
• W2950306557 title "Block coordinate descent energy minimization for dynamic cohesive fracture" @default.
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• W2950306557 doi "https://doi.org/10.1016/j.cma.2019.05.051" @default.
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