| Matrix or Vector | Geometry | Shape Functions | Integration Points |
|---|---|---|---|
| Stiffness Matrix | Quad | Equation 11–122 and Equation 11–123 and, if modified extra shapes are included (KEYOPT(2) ≠ 1) and element has 4 unique nodes, Equation 11–135 and Equation 11–136 | 2 x 2 |
| Triangle | Equation 11–101 and Equation 11–102 | 3 if axisymmetric | |
| Mass and Stress Stiffness Matrices | Quad | Equation 11–122 and Equation 11–123 | Same as stiffness matrix |
| Triangle | Equation 11–101 and Equation 11–102 | ||
| Pressure Load Vector | Same as mass matrix, specialized to face | 2 | |
| Load Type | Distribution |
|---|---|
| Element Temperature | Bilinear across element, constant thru thickness or around circumference |
| Nodal Temperature | Same as element temperature distribution |
| Pressure | Linear along each face |
Structures describes the derivation of structural element matrices and load vectors as well as stress evaluations.