Product: ABAQUS/Explicit
Benefits: This capability provides a general framework for modeling progressive damage and failure for the Mises, Johnson-Cook, Hill, and Drucker-Prager plasticity materials.
Description: ABAQUS/Explicit offers a general capability for modeling progressive damage and failure of materials. In the most general case, modeling material damage and failure requires the specification of the following:
the undamaged response of the material;
a damage initiation criterion; and
a damage evolution response, including a choice of element removal.
The damage initiation criterion defines the condition that must be satisfied at the material point prior to the onset of progressive damage. ABAQUS offers a variety of choices of damage initiation criteria, each associated with distinct types of material failure. They can be classified in the following two categories:
Damage initiation criteria for the fracture of metals, including the ductile and shear criteria.
Damage initiation criteria for necking instability of sheet metal. These include the forming limit diagram (FLD) and forming limit stress diagram (FLSD) criteria intended to assess the formability of sheet metals and the Marciniak-Kuczynski (M-K) criterion to predict necking instability in sheet metals numerically, taking into account the deformation history.
The damage evolution response describes the rate of degradation of the material stiffness once the corresponding initiation criterion has been reached. Figure 7–5 shows a typical stress-strain response of an elastic-plastic material undergoing damage. ABAQUS supports different models of damage evolution and provides controls associated with element deletion due to material failure. All of the available models of damage evolution use a formulation intended to alleviate the strong mesh dependency of the results that can arise from strain localization effects during progressive damage. The progressive damage models are suitable for both quasi-static and dynamic problems.
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