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| IMPLICIT ALGORITHM OF MULTI-YIELD-SURFACE MODEL BASED ON GENERALIZED PLASTICITY AND ITS REDEVELOPMENT IN ABAQUS |
| FENG Song1，2，ZHENG Yingren2，KONG Liang3，FENG Xiating1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Department of Architectural Engineering，Logistical Engineering University of PLA，Chongqing 400041，China；3. School of Science，Qingdao Technological University，Qingdao，Shandong 266033，China) |
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Abstract An implicit integration algorithm of constitutive equations for multi-yield-surface model with non- associative flow rule is presented firstly. The yield criterions of multi-yield-surface model are gotten by fitting the experimental data through conventional triaxial tests and true triaxial tests based on generalized plasticity. The UMAT subroutine of this model is developed in ABAQUS with the FORTRAN language through the implicit algorithm. It is easy to verify the feasibility and accuracy of the model and the program by comparing the results of numerical simulation with that given by triaxial tests.
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Received: 18 May 2011
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2011, Vol. 30 
