Theory Manual Version 3.4
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Subsubsection 6.2.4.1: Internal Work Up Subsection 6.2.4: Linearization Subsection 6.2.5: Discretization

#### 6.2.4.2 External Work

The linearization of the body force term is The linearization of the traction force term is Note that depends on the nature of the surface traction. For a prescribed traction we have . A contact analysis needs more elaborate derivations (not yet implemented as of FEBio 2.7). In the above expression we used where the unit outward normal is evaluated as
Subsubsection 6.2.4.1: Internal Work Up Subsection 6.2.4: Linearization Subsection 6.2.5: Discretization