1. Damage framework for the prediction of material defects: identification of the damage material parameters by inverse technique
- Author
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B. Bennani, Franck Lauro, Jérôme Oudin, T. Barrière, and P. Drazetic
- Subjects
Coalescence (physics) ,Engineering ,Computer simulation ,business.industry ,Dynamic loading ,Quantitative Biology::Tissues and Organs ,Forming processes ,Structural engineering ,Plasticity ,Strain rate ,business ,Finite element method ,Tensile testing - Abstract
Publisher Summary This chapter discusses a coupled damage-mechanical model for strain rate dependant voided material. The microvoid nucleation, growth, and coalescence are modeled. The ductile fracture is predicted at the end of the damage process. The improvement of the numerical simulation for crashes or forming processes under dynamic loading takes the prediction of the ductile rupture into account. The numerous material damage parameters must be defined to make the damage model available. An inverse method has been developed by coupling an optimizer and the finite element code. An experimental tensile test of the notched specimen is used to determine the variation of the inner radius of the specimen in function of the elongation. This measurement is compared with that obtained by numerical simulation and the material damage parameters are identified by minimizing the gap between these two measurements.
- Published
- 1997
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