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I am working in modelling of hyper elastic materials
I have a doubt why the stretch invariants are expressed in terms of squares as compared to strain or stress invariants expressed in terms of linear terms of strain or stress
I am working in modelling of hyper elastic materials
I have a doubt why the stretch invariants are expressed in terms of squares as compared to strain or stress invariants expressed in terms of linear terms of strain or stress
Thanks in advance
Rams
It would be better if you can include the said expressions for easier understanding.
In the first case, they are known as 'strain invariants' because they are based on the Cauchy-Green deformation tensors (both the left and the right result to the same values) whereas the second case are known as 'stress invariants' and are based on the Cauchy stress tensor.
