Recently i work on finite element model of a human vertebral body, and focus on intervertebral disc.

Based on its structure which consist of collagen fibers i have to use anisotropic hyperelastic model with reinforced fiber, and i derived the coefficients of strain energy function.

but i have some troubles to modeling this material in ansys v.10 or v.12, because i have to use user material subroutine and i have not enough information about how to define material with macro in ansys

please can someone help me with this routine, i read the help but i dont understand anything. thanks!! 

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I am working on some boundary integral equation formulation and I am currently stuck with some mathematics. I wish anyone can help me out with this. 

I have an anisotropic (sometimes called generalized) biharmonic differential operator which  takes the form

L = k11 D1^4 +  k12 D1^2 D2^2 + k22 D2^4 

where D1 = d/dx, D2 = d/dy, my problem is two dimensional.

I need to find a fundamental solution (Green's function) for this operator, that is 

L(u) = -delta

where delta is Dirac delta function.

hi, friends

 Is there any options to simulate the wave propagation(stress wave) in
ANSYS/ABAQUS.Its to validate the results i got from my MATLAB
simulation. I'm a new user of ANSYS and ABAQUS.So some body please help
me out . thanking you in advance..

 dileesh