Abaqus Keywords Reference Guide  
How to find keyword examples

*EQUATION
Define linear multi-point constraints.

This option is used to define linear multi-point constraints in the form of an equation.

Products: Abaqus/Standard  Abaqus/Explicit  Abaqus/CAE  

Type: Model data

Level: Part,  Part instance,  Assembly  

Abaqus/CAE: Interaction module

Reference:

Optional parameter:

INPUT

Set this parameter equal to the name of the alternate input file containing the data lines for this option. See “Input syntax rules,” Section 1.2.1 of the Abaqus Analysis User's Guide, for the syntax of such file names. If this parameter is omitted, it is assumed that the data follow the keyword line.

Data lines to define an equation: 

First line:

  1. Number of terms, N, in the equation.

Second line:

  1. Node number or node set label, P, of first nodal variable, .

  2. Degree of freedom, i, at above node for variable .

  3. Value of .

  4. Node number or node set label, Q, of second nodal variable, .

  5. Degree of freedom, j, at above node for variable .

  6. Value of .

  7. Etc., up to four terms per line.

Repeat the second data line as often as necessary to define all of the terms of the equation. No more than four terms can be defined on a line. To define another constraint, repeat the entire set of data lines.