Abaqus Keywords Reference Guide  
How to find keyword examples

*MATRIX
Read in the stiffness or mass matrix for a linear user element.

This option can be used only in conjunction with the *USER ELEMENT, LINEAR option. It is used to read in the stiffness or mass matrix for the user element. It can be used once if only a stiffness or mass is required or twice to give both matrices.

Product: Abaqus/Standard  

Type: Model data

Level: Part,  Part instance,  Model  

References:

Required parameter:

TYPE

Set TYPE=MASS to define the mass matrix. Set TYPE=STIFFNESS to define the stiffness matrix.

Optional parameter:

INPUT

Set this parameter equal to the name of the alternate input file from which the data lines are to be read. 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 the matrix: 

First line:

  1. Matrix entries, four per line.

Repeat this data line as often as necessary.