getShearRate Function

public pure function getShearRate(strain) result(shear)

Calculate the Shear Rate

The Shear Rate is defined as $$\dot{\gamma} = 2\sqrt{ D_{II} }$$ where $D_{II}$ is the second invariant of the strain rate tensor and defined as $$D_{II} = \sum^{l}_{\alpha,\beta=l} S_{\alpha\beta} S_{\alpha\beta}$$ where $S_{\alpha\beta}$ is the strain rate tensor.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=rk),	intent(in)			::	strain(:)	strain rate tensor: xx, yy, zz, xy, yz, zx

Return Value real(kind=rk)