PARAM, ELASSTIF

Description

This parameter can accept two arguments. If only one argument is specified, the same value is used for the second argument.

Format

PARAM, ELASSTIF, <ELASSTIFT>, <ELASSTIFR>

Parameter

Values

Description

ELASSTIFT

No default

This parameter controls the value of field “K” in the PELAS scalar elastic property entry and the CELAS2/CELAS4 scalar spring property and connection entries.

ELASSTIFT:
This value applies to translational stiffness fields on the PELAS scalar elastic property entry and the CELAS2/CELAS4 scalar spring property and connection entries.

ELASSTIFR:
This value applies to rotational stiffness values on the PELAS scalar elastic property entry and the CELAS2/CELAS4 scalar spring property and connection entries.

Note:

1.	Any value on the field “K” on the PELAS or CELAS2/CELAS4 entry which exceeds ELASSTIFT or ELASSTIFR, respectively will be replaced by ELASSTIFT or ELASSTIFR.

2.	Either ELASSTIFT or ELASSTIFR (or both) can be set to 0.0. This will disable stiffness control for the corresponding translational or rotational stiffnesses.

Defaults:

a. If ELASSTIFT is input without specifying a value, then OptiStruct will error out (no default). The default for ELASSTIFR is ELASSTIFT.

b. If PARAM, BUSHSTIF is not included in the deck, the elastic property value (Field K) is not replaced regardless of its value (no stiffness control).

4.	This parameter cannot be used to modify the values specified on CELAS2F, CELAS4F, or PELASFX Bulk Data Entries.

ELASSTIFR

Default = <ELASSTIFT>