---
type: concept
title: "Abaqus Contact Interaction Definition"
complexity: advanced
domain: computational-mechanics
created: 2026-06-01
updated: 2026-06-01
address: c-000123
aliases:
  - Abaqus general contact
  - Abaqus contact pairs
  - Abaqus contact definitions
tags:
  - concept
  - finite-element-method
  - abaqus
  - contact
  - interactions
status: current
related:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
  - "[[Finite Element Contact Formulation]]"
  - "[[Abaqus Surface and Assembly Modeling]]"
  - "[[Abaqus Contact Property Models]]"
  - "[[Abaqus Contact Formulations and Enforcement]]"
  - "[[Abaqus Standard Contact Elements]]"
sources:
  - "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
source_refs:
  - source: "[[Abaqus-Analysis-User-s-Guide-Volume-V|Abaqus Analysis User's Guide Volume V]]"
    raw_path: ".raw/AbaqusAnalysisUserGuide5/"
    raw_files:
      - "AbaqusAnalysisUserGuide5_041.md"
      - "AbaqusAnalysisUserGuide5_042.md"
      - "AbaqusAnalysisUserGuide5_054.md"
      - "AbaqusAnalysisUserGuide5_048.md"
    md_indices:
      - 41
      - 42
      - 54
      - 48
    match: "heuristic-heading-keyword"
    confidence: high
---

# Abaqus Contact Interaction Definition

## Definition

Abaqus contact interaction definition is the workflow for declaring which surfaces may interact and whether the interaction is handled by general contact, contact pairs, or contact elements.

## How It Works

General contact defines a broad contact domain and then assigns surface attributes and contact properties as needed. Contact pairs define pairwise interactions between specified surfaces. Both approaches use surfaces, but they differ in default formulation, shell thickness treatment, master/slave handling, initial overclosure handling, and product-specific capability.

In Abaqus/Standard, general contact and contact pairs share many underlying algorithms, and an analysis can include both. Contact pairs can still be needed for analytical rigid surfaces, node-based surfaces, small-sliding contact, tied contact, pressure-penetration loading, or local controls.

In Abaqus/Explicit, general contact and contact pairs are separate algorithms. General contact allows broad surface types, eroding bodies, Eulerian-Lagrangian contact, DEM/SPH contact, and simplified setup, while contact pairs provide some behaviors unavailable in general contact.

## Why It Matters

Contact setup controls which bodies can interact, which surfaces carry thickness or offsets, how initial overclosures are treated, and which numerical algorithm enforces impenetrability.

## Connections

- [[Finite Element Contact Formulation]] provides the general interface-modeling context.
- [[Abaqus Contact Property Models]] defines what happens once surfaces interact.
- [[Abaqus Contact Formulations and Enforcement]] explains the numerical enforcement branch.
- [[Abaqus Standard Contact Elements]] covers specialized contact elements when surface-based contact is not appropriate.

## Sources

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