*ELEMENT RESPONSE

Define element responses for design sensitivity analysis.

This option is used in a direct design sensitivity analysis to write element response sensitivities calculated at the integration points to the output database. It is used in an adjoint design sensitivity analysis to write an element response and its sensitivities with respect to the appropriate design variables to the output database. It must be used in conjunction with the DESIGN RESPONSE option.

This page discusses:

See Also
*DESIGN RESPONSE
In Other Guides
Direct Design Sensitivity Analysis
Adjoint Design Sensitivity Analysis

Products Abaqus/StandardAbaqus/Design

TypeHistory data

LevelStep

Optional parameters

ELSET

Set this parameter equal to the name of the element set for which this sensitivity output is being made.

LOWER BOUND

This parameter is meaningful only in an adjoint design sensitivity analysis.

This parameter is used to specify a lower bound on the design response value below which adjoint sensitivities are not calculated. That is, if the value of the design response value is below the specified lower bound, then only the design response value is written to the output database, but not the corresponding adjoint sensitivities.

NSET

This parameter is meaningful only in an adjoint design sensitivity analysis.

Set this parameter equal to the name of the node set for which this sensitivity output is being made. The element response is summed over all the nodes in this node set.

OPERATOR

This parameter is meaningful only in an adjoint design sensitivity analysis.

For the stress (MISES), plastic strain magnitude (PEMAG), or user-defined element responses, set this parameter equal to the method used for calculating the values of the responses and the approximated sensitivities based on the values of these quantities at the element integration points of the element set.

For the internal force (INTFn and INTFMAG) element responses, set this parameter equal to the method for calculating the values of the responses and the corresponding sensitivities based on the values of these quantities in the specified element set.

Set OPERATOR=MAX (default for STRESS, PEMAG, and user-defined responses) to indicate that the calculation method for the design response represents the maximum value of the element set.

Set OPERATOR=MAXABS to indicate that the calculation method for the design response represents the maximum absolute value of the element set. This parameter is not available for design responses in a steady-state dynamic analysis.

Set OPERATOR=MINABS to indicate that the calculation method for the design response represents the minimum absolute value of the element set. This parameter is not available for design responses in a steady-state dynamic analysis.

Set OPERATOR=MIN to indicate that the calculation method for the design response represents the minimum value for the element set.

Set OPERATOR=SUB to indicate that the calculation method for the design response represents the difference between the maximum and the minimum values for the element set.

Set OPERATOR=AVE to indicate that the calculation method for the design response represents the average value for the element set.

Set OPERATOR=SUM (default for INTFn and INTFMAG) to indicate that the calculation method for the design response represents the sum over the element set.

ORIENTATION

This parameter is meaningful only in an adjoint design sensitivity analysis.

Set this parameter equal to the name of an orientation definition to be used to define a local coordinate system for the element response.

UPPER BOUND

This parameter is meaningful only in an adjoint design sensitivity analysis.

This parameter is used to specify an upper bound on the design response value above which adjoint sensitivities are not calculated. That is, if the value of the design response value is above the specified upper bound, then only the design response value is written to the output database, but not the corresponding adjoint sensitivities.

USER

This parameter is meaningful only in an adjoint design sensitivity analysis.

Include this parameter to define the element design response, based on either the stress or the plastic strain tensor, in user subroutine UELEMDRESP.

Data lines to request element sensitivity output if the USER parameter is omitted

First line (only line in an adjoint design sensitivity analysis)

  1. Specify the identifying keys for the responses whose sensitivities are to be written to the output database. Only one response key can be specified in an adjoint design sensitivity analysis. The valid keys are listed in Direct Design Sensitivity Analysis and Adjoint Design Sensitivity Analysis.

In a direct design sensitivity analysis, repeat this data line as often as necessary to define the element responses whose sensitivities are to be written to the output database.

Data lines to request element sensitivity output if the USER parameter is included

First (and only) line

  1. Element response identifier label.

  2. Table collection name or blank if no table collection is used (see TABLE COLLECTION).
  3. Output variable identifier (S or PE).