Theory Manual Version 3.4
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Subsection 6.2.1: Governing Equations Up Section 6.2: Elastodynamics Subsection 6.2.3: Generalized Method for Elastodynamics

### 6.2.2 Virtual Work

The virtual work for the domain is given by where is the virtual velocity. Using the divergence theorem, this virtual work may be expressed as the difference between external virtual work and internal virtual work , where where is the traction on the boundary .
Subsection 6.2.1: Governing Equations Up Section 6.2: Elastodynamics Subsection 6.2.3: Generalized Method for Elastodynamics