Speedup of Elastic–Plastic Analysis of Large-scale Model with Crack Using Partitioned Coupling Method with Subcycling Technique
Yasunori Yusa and Shinobu Yoshimura

doi:10.3970/cmes.2014.099.087
Source CMES: Computer Modeling in Engineering & Sciences, Vol. 99, No. 1, pp. 87-104, 2014
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Keywords Fracture mechanics, plasticity, nonlinear finite element method, coupled analysis, iterative methods
Abstract

To speed up the elastic–plastic analysis of a large-scale model with a crack in which plasticity is observed near the crack, the partitioned coupling method is applied. In this method, the entire analysis model is decomposed into two non-overlapped domains (i.e., global and local domains), and the two domains are analyzed with an iterative method. The cracked local domain is modeled as an elastic–plastic body, whereas the large-scale global domain is modeled as an elastic body. A subcycling technique is utilized for incremental analysis to reduce the number of global elastic analyses. For a benchmark problem with 6 million degrees of freedom, the developed partitioned coupling solver with the subcycling technique was 3.34 times faster than the developed conventional FEM solver.

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