Description
The BSTHICK entry defines the thickness for a two-sided surfaces and an optional surface offset.
In Autodesk Explicit, shell elements give rise to two-sided surfaces. Each surface arising from a single shell element is offset from the mid-plane of the shell by the half-thickness of the element. This thickness for a shell element is defined by the PSHELL or PCOMP option. Two-sided contact can occur only if there is a shell thickness defined. A set of contiguous shell elements, each of which has a defined thickness, defines a two-sided surface. The SPEC flag is used to define the thickness model for the two-sided surface. If the NONE flag is set, the surface will have no thickness and will be made a single-sided surface. The default value of ORIG uses the original half thickness of the shells for the offset of the positive and negative side of the shells.
This option can be used with the BSORIENT option to turn off the thickness (which results in a single-sided surface) and re-orient the surface.
The CUR value for the SPEC declares that the top and bottom surface offsets should be computed from the current thickness of the shell as it deforms.
SPEC = CUR is not yet implemented and is included here for compatibility with future releases.
The OFFSET option is not yet implemented and is included here for compatibility with future releases.
Format
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| BSTHICK | CSID | SPEC | OFFSET |
Example
Make a surface single-sided with no thickness.
| BSTHICK | 21 | NONE |
| Field | Definition | Type | Default |
|---|---|---|---|
| CSID | Contact surface identification number. See Remark 1. | Integer > 0 | Required |
| SPEC | Model to be used for surface. The options are:
See Remark 2. |
Character, either ORIG, CUR, or NONE | ORIG |
| OFFSET | Surface offset: See Remark 3. | Real or blank | 0.0 |
Remarks
- The contact surface identifier references the CSID on a BSSEG entry or the CSID for a contact surface generated with a CONTACTGENERATE command. See the description of the CONTACTGENERATE command.
- Currently, only the ORIG and NONE options are implemented.
- The OFFSET option is currently not used. The OFFSET option will allow the user to set the top and bottom surfaces at some distance other than half the element thickness from the mid-plane of the element.