Learning Forum

[twata]

I have uniaxial tension and compression test data. How do I use this to model rubber materials?n

[Hui Liu]

One can use test data directly with the Response Function Hyperelastic model. This does not require any curve-fitting and will use the data exactly. One would separate and enter the uniaxial tension and compression data directly. One also need to define the compressibility either by including pressure-volume test data or specifying the material compressibility parameter. Details of the Response Function Hyperelastic model can be found in the ANSYS Help sections below:nhttps://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v190/ans_mat/aQw8sq22dldm.html%23respfunc_mat nCurve-fit to hyperelastic model: If one wish to perform curve-fitting on predefined hyperelastic models,then include both compression and tension in the uniaxial test data. Be sure to just put the values in ascending order, and there should be a (0,0) data point.n

[Alejandro Ruiz]

I have introduced the experimental data of tensile and

compression as you have indicated but the re

sults of tensile and compression are not the same.

 

Please find attached pictures for further clarification. I can't find an explanation why with the same conditions the tensile test is ok but the compression test is not. I have been thinking and testing for a long time but I can't find the answer.

 

 

Thank you very much for your support.