Midpoint and double step algorithms are interesting implicit algorithms for integrating the governing equations in plastic regime. Developing such algorithms for large deformation is complex due to the various configurations that have to be considered. In this paper a new algorithm is proposed for the integration of governig equations in large deformation plasticity which is based on midpoint rule. The time continuous model as well as algorithmic setup are discussed in details. The closed form tangent operator is derived and the efficieny of the proposed method is investigated through benchmark numerical examples.
Regards
Mohsen
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