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+---
+type: concept
+title: "Plasticity Benchmark and Input Data Cases"
+complexity: intermediate
+domain: computational-mechanics
+created: 2026-06-02
+updated: 2026-06-02
+address: c-000141
+aliases:
+  - plasticity verification cases
+  - plasticity input data cases
+tags:
+  - concept
+  - finite-element-method
+  - plasticity
+  - verification
+  - implementation
+status: current
+related:
+  - "[[Finite Element Plasticity Program Architecture]]"
+  - "[[Finite Element Modeling and Convergence Checks]]"
+  - "[[Finite Element Plasticity]]"
+  - "[[Elasto-Plastic Mindlin Plate Analysis]]"
+  - "[[Transient Dynamic Elasto-Plastic Analysis]]"
+sources:
+  - "[[Finite-Elements-in-Plasticity-Theory-and-Practice|Finite Elements in Plasticity: Theory and Practice]]"
+---
+
+# Plasticity Benchmark and Input Data Cases
+
+## Definition
+
+Plasticity benchmark and input data cases are small finite element models used to verify elasto-plastic, elasto-viscoplastic, structural plasticity, and dynamic plasticity implementations.
+
+## Source Cases
+
+The appendices in [[Finite-Elements-in-Plasticity-Theory-and-Practice|Finite Elements in Plasticity: Theory and Practice]] document input data for several program families:
+
+- `PLANET` for elasto-plastic plane and axisymmetric solids.
+- `VISCOUNT` for elasto-viscoplastic two-dimensional solids.
+- `MINDLIN` and `MINDLAY` for nonlayered and layered elasto-plastic Mindlin plates.
+- `DYNPAK` and `MIXDYN` for transient dynamic elasto-plastic or viscoplastic analysis.
+
+The cases include element selections, material parameters, yield-criterion flags, load data, boundary conditions, and output expectations.
+
+## Why It Matters
+
+For a custom solver, these cases are useful as a verification pattern even when the original FORTRAN programs are not reused. A good plasticity test harness should compare displacement, reactions, element forces, stress components, and plastic state variables against a reference solver or a trusted benchmark.
+
+## Harness Use
+
+- Start with single-element elastic and plastic patch cases.
+- Add small plane stress, plane strain, and axisymmetric plasticity cases.
+- Add beam and Mindlin plate section-yielding cases.
+- Add rate-dependent and transient dynamic cases only after the static plasticity state update is stable.
+- Record tolerances separately for nodal, element, and stress/state outputs.
+
+## Sources
+
+- [[Finite-Elements-in-Plasticity-Theory-and-Practice|Finite Elements in Plasticity: Theory and Practice]]
+