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uniaxial test data for hyperelastic material

uniaxial test data for hyperelastic material

uniaxial test data for hyperelastic material

(OP)
hi, everyone

we are studying about the hyperelastic material for Dummy model.

Using Polynomial n=2 and Ogden model n=3 and some other hyperelastic model, we could get good fitting results in an one mode.

we do know that if we have three basic test data(uniaxial tension, equibiaxial tension, planar test data), we can fit well using those hyperelastic model assuming the test datas are all reliable.

but we don't know why can't fit both uniaxial tension and uniaxial compression test data simultaneously. if we use only one of that test data, we can fit well though.

we tried to use the hyperelastic coefficients from the unaxial tension and equibiaxial tension test data and fit the uniaxial compression test data. but the results of that was not good especially in short strain range.

how can we achieve a good result in both uniaxial tension and compression mode.

please help us.

thank you.
 

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