*SUBSTRUCTURE MATRIX OUTPUT

Keyword type: step

This option is used to define the name of the file in which the stiffness matrix of the substructure is to be stored which is generated within a *SUBSTRUCTURE GENERATE step. This is the only procedure in which this keyword card makes sense.

There is one optional parameter STIFFNESS, and two required parameters FILE NAME and OUTPUT FILE.

The optional parameter STIFFNESS can only take a fixed value: STIFFNESS=YES. The parameter OUTPUT FILE can take the value USER DEFINED or MATRIX. If the value is USER DEFINED the output format resembles a user element definition. For the value MATRIX the resulting stiffness file can be used in a *MATRIX ASSEMBLE keyword. In this way it is defined as superelement and the output format consists of lines listing the row node number, row degree of freedom, column node number, column degree of freedom and matrix entry value.

The required parameter FILE NAME is used to define the name of the file in which the stiffness is to be stored. The extension .mtx is default and cannot be changed. It is automatically appended to the name given by the user.

First line:

• *SUBSTRUCTURE MATRIX OUTPUT
• Enter the parameter FILE NAME and OUTPUT FILE and their values, and optionally, the parameter STIFFNESS with its fixed value.

Example:

*SUBSTRUCTURE MATRIX OUTPUT,FILE NAME=substruc,OUTPUT FILE=MATRIX

defines file substruc.mtx for the storage of the substructure stiffness matrix in MATRIX format.

Example files: substructure, substructure2.