Coordinate Reference Transformation
Since stress and strain are second order tensors, the following equation will be used to transform these quantities to a reference coordinate system:
where:
■
is the skew-rotation matrix from the flexible body’s LPRF (FE origin) to the marker’s coordinate reference
is the skew-rotation matrix from the flexible body’s LPRF (FE origin) to the marker’s coordinate reference■
is the symmetric stress or strain tensor:
is the symmetric stress or strain tensor: 