13.216. CPT216 - 3-D 20-Node Coupled Pore-Pressure-Thermal Mechanical Solid

Matrix or Vector	Geometry	Shape Functions	Integration Points
Stiffness and Stress Stiffness Matrices	Brick	Equation 11–232, Equation 11–233, and Equation 11–234	14
	Wedge	Equation 11–208, Equation 11–209, and Equation 11–210	3 x 3
	Pyramid	Equation 11–192, Equation 11–193, and Equation 11–194	2 x 2 x 2
	Tet	Equation 11–184, Equation 11–185, and Equation 11–186	4
Mass Matrix	Same as stiffness matrix.		3 x 3 x 3 if brick. If other shapes, same as stiffness matrix
Pressure and Temperature Load Vector	Quad	Equation 11–84 and Equation 11–85	3 x 3
Pressure and Temperature Load Vector	Triangle	Equation 11–57 and Equation 11–58	6
Flow Load Vector	Quad	Equation 11–84 and Equation 11–85	3 x 3
Flow Load Vector	Triangle	Equation 11–57 and Equation 11–58	6
Damping Matrices	Same as stiffness matrix

Load Type	Distribution
Element Temperature	Bilinear in plane of element
Nodal Temperature	Same as shape functions thru element
Surface Pressure Load	Bilinear across each face
Flow and heat flux	Bilinear across each face

General Element Formulations gives the general element formulations used by this element.