Hi Dr. Jorgen,

I am modeling sharp-probe indentation of a rubber-like material.

I am interested to use eight-chain model in Abaqus to obtain force-indentation curves and show the different effects of changing Lambda(locking stretch) and mu(initial shear modulus) on the curves. However both seem to have similar influences on the curves, I mean by decreasing Lambda, the reaction force on the tip increases and so is when the shear modulus is increased. So I observed that many identical curves can be found with same cavity and amplitude based on different values for mu and lambda.

How can I detect the distinct influence of each of these paramters in their special way. Lambda and Mu should be different after all.

Many thanks

I am modeling sharp-probe indentation of a rubber-like material.

I am interested to use eight-chain model in Abaqus to obtain force-indentation curves and show the different effects of changing Lambda(locking stretch) and mu(initial shear modulus) on the curves. However both seem to have similar influences on the curves, I mean by decreasing Lambda, the reaction force on the tip increases and so is when the shear modulus is increased. So I observed that many identical curves can be found with same cavity and amplitude based on different values for mu and lambda.

How can I detect the distinct influence of each of these paramters in their special way. Lambda and Mu should be different after all.

Many thanks

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