| Matrix or Vector | Geometry | Shape Functions | Integration Points |
|---|---|---|---|
| Stiffness and Damping Matrices; and Thermal Load Vector | Quad | Equation 11–122 and Equation 11–123 | 1 x 1 for bulk strain effects |
| Triangle | Equation 11–101 and Equation 11–102 | 1 x 1 for bulk strain effects | |
| Mass Matrix | Same as stiffness matrix. Matrix is diagonalized as in Lumped Matrices. | Same as for shear effects | |
| Pressure Load Vector | Same as stiffness matrix, specialized to the face | 2 | |
| Load Type | Distribution |
|---|---|
| Element Temperature | Average of the four nodal temperatures is used throughout the element |
| Nodal Temperature | Same as element temperature distribution |
| Pressure | Linear along each face |
Structures describes the derivation of element matrices and load vectors. The fluid aspects of this element are the same as described for FLUID80.