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wiki/concepts/Abaqus Metal Plasticity Models.md

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+---
+type: concept
+title: "Abaqus Metal Plasticity Models"
+complexity: advanced
+domain: computational-mechanics
+created: 2026-06-01
+updated: 2026-06-01
+address: c-000096
+aliases:
+  - Abaqus plasticity
+  - Abaqus metal plasticity
+  - Abaqus Johnson-Cook plasticity
+  - Abaqus cyclic hardening
+tags:
+  - concept
+  - finite-element-method
+  - abaqus
+  - plasticity
+  - materials
+status: current
+related:
+  - "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
+  - "[[Abaqus Material Library and Data Definition]]"
+  - "[[Abaqus Constitutive Integration]]"
+  - "[[Nonlinear Finite Element Analysis]]"
+  - "[[Abaqus Progressive Damage and Failure]]"
+sources:
+  - "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
+---
+
+# Abaqus Metal Plasticity Models
+
+## Definition
+
+Abaqus metal plasticity models describe irreversible deformation, hardening, rate effects, thermal history effects, and specialized metal behavior within the Abaqus material library.
+
+## How It Works
+
+The guide frames most plasticity models as incremental theories. A yield surface determines whether the response is elastic, a flow rule determines plastic strain increments, and hardening or evolution laws update the yield or flow definition as inelastic deformation accumulates.
+
+For metals, the major built-in families include classical Mises and Hill plasticity, isotropic and kinematic hardening, cyclic hardening, rate-dependent yield, creep and swelling, annealing or melting, anisotropic yield and creep, Johnson-Cook plasticity for high-strain-rate deformation, dynamic failure models, porous metal plasticity, cast iron plasticity, two-layer viscoplasticity, the ORNL model, and deformation plasticity for fully plastic fracture-mechanics solutions.
+
+The source highlights data interpretation details: plastic hardening data use plastic strain rather than total strain; finite-strain metal data should generally be true stress and logarithmic plastic strain; and initial equivalent plastic strain can be supplied when prior hardening must be represented.
+
+## Why It Matters
+
+Plasticity is the primary material nonlinearity in many structural and manufacturing analyses. The correct model depends on loading history, rate, temperature, pressure dependence, cyclic behavior, and whether damage or failure is part of the simulation goal.
+
+## Connections
+
+- [[Abaqus Constitutive Integration]] performs the integration-point return/evolution calculations implied by plasticity models.
+- [[Nonlinear Finite Element Analysis]] provides the global incremental framework for plastic deformation.
+- [[Abaqus Progressive Damage and Failure]] often extends plasticity models with stiffness degradation and element deletion.
+
+## Sources
+
+- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]
+