OOF2: The Manual

`Nonlinear Geometric Strain (NonlinearGeometricStrain)`
	6.5.2. Subclasses

Name

Nonlinear Geometric Strain (NonlinearGeometricStrain) — Rotationally invariant symmetric derivative of the displacement field.

Synopsis

NonlinearGeometricStrain()

Details

Base class: StrainType

Description

The nonlinear geometric strain is the rotationally invariant form of the GeometricStrain. It is the form of the strain used by the large strain elasticity properties. Specifically,

\epsilon_{ij}=\frac{1}{2}\left({\frac{\partial u_{i}}{\partial x_{j}}}+{\frac{% \partial u_{j}}{\partial x_{i}}}+{\frac{\partial u_{k}}{\partial x_{i}}}{\frac% {\partial u_{k}}{\partial x_{j}}}\right)

(6.152)

where $\epsilon_{ij}$ is the strain, $u$ is the displacement, and the repeated index k is summed.


`Non-boundary Nodes (NonBoundaryNodes)`		`Once (Once)`