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A thermodynamically consistent discontinuous Galerkin formulation for interface separation
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DOI：10.1016/j.compstruct.2015.07.080.png)
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摘要
En 中文
This paper describes the formulation of an interface damage model, based on the discontinuous Galerlcin (DG) method, for the simulation of failure and crack propagation in laminated structures. The DG formulation avoids common difficulties associated with cohesive elements. Specifically, it does not introduce any artificial interfacial compliance and, in explicit dynamic analysis, it leads to a stable time increment size which is unaffected by the presence of stiff massless interfaces. The proposed method is implemented in a finite element setting. Convergence and accuracy are demonstrated in Mode I and mixed-mode delamination in both static and dynamic analyses. Significantly, numerical results obtained using the proposed interface model are found to be independent of the value of the penalty factor that characterizes the DG formulation. By contrast, numerical results obtained using a classical cohesive method are found to be dependent on the cohesive penalty stiffnesses. As a result of this notable advantage, the proposed approach is shown to yield more accurate predictions pertaining to crack propagation under mixed-mode fracture. Furthermore, in explicit dynamic analysis, the stable tithe increment size calculated with the proposed method is found to be an order of magnitude larger than the maximum allowable value for classical cohesive elements. (C) 2015 Elsevier Ltd. All rights reserved.
Keyword:
Interface failure
De lamination
Cohesive-zone models
Damage modeling
Discontinuous Galerkin method
Dynamic structural analysis
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期刊
IF:
7.1
论文数:
1.8W
被引数:
8.0W
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