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Theory Manual Version 3.6
 Section 4.1: Solid Elements Up Section 4.1: Solid Elements Subsection 4.1.2: Pentahedral Elements 

4.1.1 Hexahedral Elements

FEBio implements an 8-node trilinear hexahedral element. This element is also known as a brick element. The shape functions for these elements are defined in function of the isoparametric coordinates , and and are given below. The following integration rule is implemented for this element type.
8-point Gauss rule
r s t w
-0.577350269 -0.577350269 -0.577350269 1
0.577350269 -0.577350269 -0.577350269 1
0.577350269 0.577350269 -0.577350269 1
-0.577350269 0.577350269 -0.577350269 1
-0.577350269 -0.577350269 0.577350269 1
0.577350269 -0.577350269 0.577350269 1
0.577350269 0.577350269 0.577350269 1
-0.577350269 0.577350269 0.577350269 1
 Section 4.1: Solid Elements Up Section 4.1: Solid Elements Subsection 4.1.2: Pentahedral Elements