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Hi,

I am new here and have a very basic question on the Strain Energy Density (SED) function of exponential model.

 This is the exponential model SED form : W=a(e^(b(I₁-3))-1)

Now we have certain postulates such as that

1.W=0 when there is no deformation and

2. stress=0 when strain =0.

 When there is no deformation I1=3 and hence W=0, which is correct.

Why do some strain energy density (SED) function have 1 invariant (like neo-Hookean) while some others have both 1st and 2nd invariant like mooney-rivlin? is there a specific reason behind using 1st invariant in SED vs all invariants in the SED?

N 

As a follow-up, here is a photograph of a (rather extreme) case of conductor fatigue.

Hi,

I am modeling a 3D simply supported beam in ansys using a SOLID95
element. In this case, how should I give
the B.C.s? Should I apply B.C.s to

1) the mid nodes on the edge of beam? or

2) to the entire edge? or

3)  just to the bottom nodes?

according to me, I have tried to use the various B.C case, but the
results are very different even though the nodes number taken in account
change slightly, and for all case, the result is not satisfactory with
my analytical solution. plz help.

 Thanks in avance!

For more information, please check out my homepage: 

http://www.engineering.uiowa.edu/~weifhu/index.htm

This post is to share where to go for the computational modelling. Should computation modelling focus on advance the solver convergence or focus on experiment verification?

The experiment verification always expensive and high cost involved. For solver convergence, it is always take time but less cost involved, however even with advance computational power and smart equation, we always face problem on verfiy our result through experiement stage.