6 REFERENCES ................................................................................................................. 81 7 APENDIX USER INFERFACE - USERMPLS .................................................................... 83 7.1.1 LAW = 99 – User-Material ......................................................................................................... 83 7.1.2 Requirements of ANSYS (Release 13) ..................................................................................... 83 7.1.3 User materials in <strong>multiPlas</strong> ........................................................................................................ 84 4 USER’S MANUAL, January, 2013
1 INTRODUCTION This manual describes the use of <strong>Dynardo</strong>’s software product <strong>multiPlas</strong> for ANSYS. <strong>multiPlas</strong> is a library of elasto-plastic material models for ANSYS. The elasto-plastic material models in <strong>multiPlas</strong>, enable the user to simulate elasto-plastic effects of artificial materials, e.g. steel or concrete, and natural born materials, e.g. soil or rock, in geotechnics, civil engineering - as well as - mechanical engineering. In the context of finite element calculations with ANSYS, <strong>multiPlas</strong> provides an efficient and robust algorithm for the handling of single and multi-surface plasticity. The material models are based on elastoplastic flow functions with associated and non-associated flow rules. One special feature of the <strong>multiPlas</strong> material models is the combination of isotropic and anisotropic yield conditions. The <strong>multiPlas</strong> material models are available for structural volume elements (e.g. SOLID 45, SOLID 95), for structural shell elements (e.g. SHELL 43, SHELL 93) and structural plane elements (e.g. PLANE 42, PLANE 82). The following material models and features are provided: Model Application Flow Rule isotropic Material Models: Stress-Strain Response Tresca Steel, ... associative bilinear, ideal elastic-plastic Mohr-Coulomb Soil, Rock, Stone, Masonry, ... non-associative von Mises Steel, ... associative Drucker-Prager Soil, Stone, ... associative modified Drucker-Prager Stone, Cement, Concrete, ... associative Temperature Dependency bilinear, residual strength yes bilinear, ideal elastic-plastic bilinear, ideal elastic-plastic bilinear, ideal elastic-plastic yes Concrete, Cement, nonlinear hardening Concrete Stone, Brick, ... non-associative and softening yes Tension cut off rotated cracking associative residual strength anisotropic Material Models: Joints, jointed Rock, Cohesive bilinear, Mohr-Coulomb Zones, ... non-associative residual strength Masonry_Ganz Masonry, ... non-associative Tsai / Wu Wood, ... associative boxed value Wood, ... associative Tension cut off fixed cracking, Cohesive Zones associative nonlinear hardening and softening yes bilinear, ideal elastic-plastic multilinear hardening and softening residual strength / exponential softening Additionally, all Mohr-Coulomb Models are coupled with a tension cut-off yield surface. In simulations of joint materials (e.g. jointed rock), it is possible to arrange the joint sets arbitrarily. Isotropic and anisotropic Mohr-Coulomb yield surfaces can be combined in manifold ways. Up to 4 joint sets can be associated with an isotropic strength definition. MultiPlas has been successfully applied in nonlinear simulations of and concrete as well as in stability analysis of soil or jointed rock. 5 USER’S MANUAL, January, 2013
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