Abaqus geomaterial and concrete plasticity models describe pressure-dependent inelastic response, compaction, dilatancy, cracking, crushing, and stiffness degradation for soils, rocks, foams, jointed materials, and concrete-like media.
How It Works
The source separates these models from ordinary metal plasticity because hydrostatic pressure can strongly influence yielding and volume change. Extended Drucker-Prager models represent pressure-dependent materials such as granular materials and polymers. Modified Drucker-Prager/Cap models add a cap yield surface to control volumetric compaction. Mohr-Coulomb and critical-state clay models support geotechnical applications with pressure and invariant-dependent yield behavior.
Crushable foam models target energy-absorbing foams and similar crushable media. Jointed material behavior represents continua containing dense sets of joint surfaces, such as sedimentary rock. Concrete is represented by multiple models: smeared cracking in Abaqus/Standard, brittle cracking in Abaqus/Explicit, and concrete damaged plasticity in both solvers.
Why It Matters
These materials cannot usually be modeled by metal-style pressure-insensitive plasticity. They require pressure-dependent yield surfaces, inelastic volumetric strain, tensile cracking, crushing, or damage recovery effects that are tied to element choice, confinement, and loading path.
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