I am trying to model a hip with soft tissue impacting the ground using ANSYS 18 Explicit. From a paper, the soft tissue should be modelled as hyperelastic and it used the Mooney-Rivlin model. The values it states are:
C10 = 85.5kPa
C01 = 21.38kPa
I then calcuated d1 to be 9.39e-8.
But when the soft tissue impacts the floor it expands rapidly and the femur just continues to travel through the tissue!
Any ideas why this is happening or how I can fix it?
Thanks Maddy
hi, Madeleine, how did you calculate D1 and what density are you taking? Is your material in compressible which seems from low D1 value ?
hi Madeleine,
I am not an expert on this but one approach which i always use is that instead of using coefficients from literature i prefer to fit the data (experimental from literature) into different hyperelastic models i.e. Neo-hookean, Mooney-Rivlin etc. It does help to use models which are not "polynomial" base in large deformation analysis.
I suggest fit experimental data and calculate your own coefficients and you can check the stability of your model also. ABAQUS provide this feature where you can fit experimental data into different hyperelastic models.
Best of Luck!
Zeeshan
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