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| concept | Abaqus Matrix-Based Model Definition | advanced | computational-mechanics | 2026-05-29 | 2026-05-29 | c-000075 |
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Abaqus Matrix-Based Model Definition
Definition
Abaqus matrix-based model definition is the use of directly supplied stiffness, mass, viscous damping, or structural damping matrices as part of an Abaqus/Standard model.
How It Works
The guide describes named matrix input in text or SIM form. A matrix can be symmetric or unsymmetric, scaled, and assembled into the analysis model through shared nodes or explicit node remapping. Matrix-based components can represent a model part when the analyst already has a linearized matrix description from another source or from a previous analysis.
Matrix assembly connects matrix-represented regions to conventionally meshed regions. In nonlinear analyses, the supplied matrix contribution remains linear; the surrounding model can still undergo nonlinear material, contact, or geometric response depending on the procedure and connected elements.
Volume II adds the complementary generation workflow: Abaqus/Standard can generate stiffness, mass, damping, and load matrices in a linear perturbation step and write them to SIM or text files for later Abaqus input or external software.
Why It Matters
Matrix input exposes the algebraic layer of finite element analysis. It connects production ABAQUS modeling to Direct Stiffness Method ideas: element or component contributions become matrices that are assembled into global static or dynamic equations.
Connections
- Static Equilibrium Equation Solvers solve stiffness-based systems that matrix input can contribute to.
- Direct Time Integration Methods can use mass and damping matrices in transient dynamics.
- Finite Element Program Implementation explains the matrix assembly and global equation context behind this feature.
- Abaqus Matrix Generation and Reduced Models covers the export side of the same matrix-based workflow.