Effective & Efficient Material Modeling Using DIGIMAT’s Nonlinear Multi-Scale Modeling Technology with the HyperWorks Suite
Roger Assaker, e-Xstream
Fast and cost efficient design of higher quality, lighter and more energy efficient vehicles is one of the key success factors for today’s automotive industry. Predictive CAE and the use of composites materials, offering good weight to mechanical performance ratio, are two ingredients that will help the industry moving forward profitably.
The nonlinear Finite Element Analysis (FEA) of automotive parts using homogeneous isotropic materials like steel is challenging but has become today a standard step in any modern design process. The FEA of metallic parts is very well performed using one of the leading FEA packages on the market today.
The nonlinear FEA of injection molded parts using fiber-reinforced plastics is much more challenging and still suffers from a lack of modeling tools, simulation procedures and the material data that are needed to deal with the local, process-dependent, anisotropic, nonlinear and strain rate dependent behavior of the reinforced plastics.
In this presentation, we will introduce the nonlinear micromechanical modeling technology that can be used to predict the nonlinear behavior and failure of multi-phase materials, based on their underlying microstructure (e.g. fiber content, fiber orientation, fiber length, …). The multi-scale material modeling process, used to model the reinforced plastic part, will then be presented. This process uses RADIOSS as the structural FEA package at the part level coupled to nonlinear micromechanically-based material models, taking into account the fiber orientation induced by the injection molding of the part.
Nonlinear multi-scale modeling technology, including mean-field homogenization methods (e.g. Mori-Tanaka), advanced material models (e.g. Elasto-Viscoplastic and Micro Failure), realistic microstructures (e.g. complex fiber orientation and fiber length distribution) and strong coupling to the major injection molding and to RADIOSS is implemented in the DIGIMAT software platform.
The industrial use of nonlinear multi-scale modeling technology will be illustrated with a beam designed by Rhodia Polyamide being subject to impact loading conditions. This presentation is prepared by e-Xstream engineering, in partnership with Rhodia Polyamide, and will be presented by e-Xstream engineering.