A Modified Symmetric and Antisymmetric Decomposition-Based Three-Dimensional Numerical Manifold Method for Finite Elastic-Plastic Deformations  

作　　者：Jinfu Ke Shuilin Wang 

机构地区：[1]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Xiaohongshan,Wuchang,Wuhan 430071,Hubei,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Acta Mechanica Solida Sinica》2020年第1期71-97,共27页固体力学学报（英文版）

基　　金：This research is supported by the National Basic Research Program of China(973 Program,Grant No.2014CB047100);the National Natural Science Foundation of China(Grant Nos.41472289,51179185 and 41807275).

摘　　要：There are relatively few studies on large rotation or deformation by means of the three-dimensional(3D)numerical manifold method(NMM).A new modified symmetric and antisymmetric decomposition(MSAD)theory is developed and implemented into the 3D NMM,eliminating the false-volume expansion and false-rotation strain/stress problems.The Jaumann rate is used to measure the material rotation,and the geometric stiffness built on the Jaumann rate is deduced.The incremental formulas of the MSAD-based 3D NMM and a practical guide on the implementation of the MSAD theory are given in detail and exemplified.The new theory and formulas can be applied to analyze both large rotation and large deformation problems.Based on the hypoelasto-plasticity theory and the unified strength theory,the unified yield criterion with associated flow rule is implemented into the MSAD-based 3D NMM.Several typical examples are studied,showing the advantage and potential of the new MSAD theory and the MSAD-based 3D NMM.

关 键 词：Modified symmetric and antisymmetric decomposition theory Three-dimensional numerical manifold method Finite elastic plastic deformations Hypoelasto-plasticity Unified strength theory 

分 类 号：O341[理学—固体力学]