Green StrainsΒΆ
In a 2D-DIC analysis, a two-dimensional displacement field is measured. Here denotes a position in the reference coordinate system. denotes the time, usually associated to the image ID in a sequence of images.
For any position and any time the two-dimensional deformation gradient may be calculated as:
The two-dimensional right Cauchy-Green deformation tensor is then calculated as:
The Green strain matrix is defined as:
At component level this gives: