Mapdl.sspb(b11='', b21='', b31='', b22='', b32='', b33='', t='', b12='', b13='', b23='', **kwargs)#

Specifies a preintegrated coupling stiffness for shell sections.

APDL Command: SSPB

b11, b21, b31, b22, b32, b33

Coupling stiffness component (symmetric lower part of submatrix [B]).



b12, b13, b23

Upper part of submatrix [B]


The behavior of shell elements is governed by the generalized- stress/generalized-strain relationship of the form:

If the coefficients B12, B13, B23 are undefined, ANSYS uses a symmetric form of submatrix [B]. If any one of the coefficients B12, B13, B23 is nonzero, ANSYS considers submatrix [B] to be unsymmetric.

The SSPB command, one of several preintegrated shell section commands, specifies the coupling stiffness quantity (submatrix [B] data) for a preintegrated shell section. The section data defined is associated with the section most recently defined (via the SECTYPE command).

Unspecified values default to zero.

Related commands are SSPA, SSPD, SSPE, SSMT, SSBT, 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.