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8. Element reference

Element functions supported by OpenFEM are listed below. The rule is to have element families (2D and 3D) with families of formulations selected through element properties and implemented for all standard shapes

3-D volume element shapes
hexa8	8-node 24-DOF brick
hexa20	20-node 60-DOF brick
hexa27	27-node 81-DOF brick
penta6	6-node 18-DOF pentahedron
penta15	15-node 45-DOF pentahedron
tetra4	4-node 12-DOF tetrahedron
tetra10	10-node 30-DOF tetrahedron

2-D volume element shapes
q4p	4-node quadrangle
q5p	5-node quadrangle
q8p	8-node quadrangle
q9a	9-node quadrangle
t3p	3-node 6-DOF triangle
t6p	6-node 12-DOF triangle

Supported problem formulations are listed in section 5.2, in particular one considers 2D and 3D elasticity, acoustics, hyperelasticity, fluid/structure coupling, piezo-electric volumes, ...

Other elements, non generic elements, are listed below

3-D plate/shell Elements
dktp	3-node 9-DOF discrete Kirchoff plate
mitc4	4-node 20-DOF shell
quadb	quadrilateral 4-node 20/24-DOF plate/shell
quad9	(display only)
quadb	quadrilateral 8-node 40/48-DOF plate/shell
tria3	3-node 15/18-DOF thin plate/shell element
tria6	(display only)

Other elements
bar1	standard 2-node 6-DOF bar
beam1	standard 2-node 12-DOF Bernoulli-Euler beam
beam1t	pretensionned 2-node 12-DOF Bernoulli-Euler beam
beam3	(display only)
celas	scalar springs and penalized rigid links
mass1	concentrated mass/inertia element
mass2	concentrated mass/inertia element with offset
rigid	handling of linearized rigid links

Utility elements
fe_super	element function for general superelement support
integrules	FEM integration rule support
fsc	fluid/structure coupling capabilities

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