- Mapdl.ssbt(bt11='', bt22='', bt12='', t='', **kwargs)¶
Specifies preintegrated bending thermal effects for shell sections.
APDL Command: SSBT
- bt11, bt22, bt12
Bending thermal effects component [BT].
The behavior of shell elements is governed by the generalized- stress/generalized-strain relationship of the form:
The SSBT command, one of several preintegrated shell section commands, specifies the bending thermal effects quantity (submatrix [BT] data) for a preintegrated shell section. The section data defined is associated with the section most recently defined (via the SECTYPE command).
The [BT] quantity represents bending stress resultants caused by a unit raise in temperature on a fully constrained model. For a layered composite shell, it is usually necessary to specify both the [BT] and [MT] quantities (by issuing the SSBT and SSMT commands, respectively).
Unspecified values default to zero.
Related commands are SSPA, SSPB, SSPD, SSPE, SSMT, and SSPM.
If you are using the SHELL181 or SHELL281 element’s Membrane option (KEYOPT(1) = 1), it is not necessary to issue this command.
For complete information, see Using Preintegrated General Shell Sections.