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Determination of material Mechanical Properties in ANSYS using Force-Displacement graph obtianed experimentally

Hi all.

I am a doctor course student in Biomechanics in Nagoya University - Japan.

I read a bunch of papers in which the determining the conffecients of hyperelasticty of the skin soft tissue was done by using FE Simulation of an expermiment that can be performed on the skin then TWEAKING (IN FACT ANSYS SUPPOSE TO HAVE AN ITERATIVE MODEULE TO DO THIS) the conffecients so THAT the force-displacement results from the simulation are close enough to the ones obtained from experiment.

NOW:

I have the Experiment results

I have a FE model of the experiment

I chose ogden model for the hyperelasticity of the skin,    AND THE QUESTION IS :

 

HOW CAN I MAKE ANSYS MANIPULATE THE MATERIAL PROPERTIES SO THE DIFFERENCE BETWEEN THE SIMULATION RESULTS AND THE EXPERIMENTAL RESULTS IS MINIMUM??

 Any help (with some details or links to examples) would be highly appreciated.

 

Best Regards

Abdullah

 

ruogang zhao's picture

Hi  Abdulla,

The problem you mentioned can be solved using an inverse FE method which couples the FE analysis with an optimization algorithum. Please see these papers for the description of the inverse FE method.

Humphrey, J. D., Strumpf, R. K., and Yin, F. C. P., 1990, ‘‘Determination of a Constitutive Relation for Passive Myocardium: II. Parameter Estimation,’’ASME J. Biomech. Eng., 112, pp. 340–346.

F. Lei, A.Z. Szeri,  Inverse analysis of constitutive models: Biological soft tissues , Journal of Biomechanics 40 (2007) 936–940

 

Good luck!

 Ruogang

 

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