---
type: concept
title: "Abaqus Material Library and Data Definition"
complexity: intermediate
domain: computational-mechanics
created: 2026-06-01
updated: 2026-06-01
address: c-000093
aliases:
  - Abaqus material data definition
  - Abaqus material library
  - material behavior combinations
tags:
  - concept
  - finite-element-method
  - abaqus
  - materials
  - constitutive-modeling
status: current
related:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
  - "[[Abaqus Input File Syntax]]"
  - "[[Abaqus Spatial Model Definition]]"
  - "[[Abaqus Constitutive Integration]]"
  - "[[Abaqus User-Defined Material Behavior]]"
sources:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
source_refs:
  - source: "[[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]"
    raw_path: ".raw/AbaqusAnalysisUserGuide3/"
    raw_files:
      - "AbaqusAnalysisUserGuide3_005.md"
      - "AbaqusAnalysisUserGuide3_004.md"
      - "AbaqusAnalysisUserGuide3_019.md"
      - "AbaqusAnalysisUserGuide3_042.md"
    md_indices:
      - 5
      - 4
      - 19
      - 42
    match: "heuristic-heading-keyword"
    confidence: high
---

# Abaqus Material Library and Data Definition

## Definition

Abaqus material library and data definition is the keyword-level system for naming materials, combining compatible material behaviors, supplying property data, and attaching those materials to model regions through section definitions.

## How It Works

A material definition starts with a named `*MATERIAL` block and then contains one or more material behavior options. A simple linear static stress analysis may need only elasticity, while nonlinear, thermal, coupled-field, or damage analyses may combine elasticity, density, plasticity, damping, expansion, conductivity, damage, and other behavior blocks.

Material data can depend on temperature and independent field variables. In Abaqus/Standard some behavior can also depend on solution variables. For anisotropic behavior, the material may require a local coordinate system; for spatially varying behavior in homogeneous solid continuum elements, some properties can be supplied through distributions.

The source emphasizes data discipline: tabular material data must be ordered by increasing independent variable values, enough points must be supplied to represent strongly nonlinear behavior, and finite-strain material data should use true stress and logarithmic strain when required by the model.

## Why It Matters

The material library is where a finite element model becomes physically specific. The same mesh and procedure can represent a metal forming operation, elastomer seal, concrete structure, porous soil, acoustic medium, or electromagnetic material depending on the material blocks attached to the model.

## Connections

- [[Abaqus Input File Syntax]] supplies the keyword and data-line structure used by material definitions.
- [[Abaqus Spatial Model Definition]] assigns materials to element regions through sections.
- [[Abaqus Constitutive Integration]] is the integration-point process that consumes material definitions during an analysis.
- [[Abaqus User-Defined Material Behavior]] extends the material library when built-in behavior is insufficient.

## Sources

- [[Abaqus-Analysis-User-s-Guide-Volume-III|Abaqus Analysis User's Guide Volume III]]