Learning Forum

[navidvd]

Hi

I am planning to use the experimental material properties of artery models in the Ansys Structural. The experimental data that I have is for longitudinal and circumferential directions and I do not have any data for radial directions. I am wondering if anyone has any suggestions on how I can use these data in Structural. Which model to use? And what should I do with the data about the third direction that I do not have?

[John Doyle]

Ansys does have an option for Anisotropic Hyperelasticity material option for such applications. Unfortunately, we do not have curve fitting tool for this material to help you derive the coefficients from the experimental data. If you have data in the longitudinal and circumferential directions, I think that is a good start. I would consider these as properties in the 'A' direction and 'B' direction. Please refer to Section 4.6.4 of the MAPDL Theory Manual for more details on this material option.
Refer also to:
Lekhnitskii, S. G.(1963).Theory of Elasticity of an Anisotropic Elastic Body.San Francisco, CA:Holden-Day.
Valliappan, S.(1976).Nonlinear analysis for anistropic materials.International Journal for Numerical Methods in Engineering.10, 597-606.