I've tried some compression tests with a single Hex element and that's the resolut:
http://img18.imageshack.us/img18/6562/creepn.gif
I think that probably it's alright but the creeping has been seriously linearized (I don't know - maybe it's due to the plot scale etc).
I've evaluated both...
Thanks for reply. I'll try this. I thought that I must have test data in order to use the "evaluate" option.
there might be something wrong with those hyperelestic constans as D is relatively high, which means that the Poissons ratio should be close to zero (and I get a warning message that the...
I intend to use a model where the instantanous response is nonlinear elastic (hyperelastic - Neo Hooke potential) and is followed with a viscoleastic response (linear model - Prony series).
It doesn't calculate a single increment and I get information about "negative eigenvalues" and heavily...
Thanks for reply. The problem is solved.
This is my first time with hyperelasticity and a just enetered wron costant values (in the table the unit wasn't mentioned). I figured that the unit is MPa and now it completes the analysis.
I still get an error that the system matrix has negative eigenvalues. It doesn't calculate even a single increment.
I've read thet this error message usually means that I should improve the mesh. But I quite don't know what would need an inmprovement in my case.
I use Hex, structured mesh...
Hello,
I'm doing an analisis of a feature that has small stiffness inside and big stiffness on the surface (and close to it).
I've decided to define a skin on the feature's surface and then assign a proper section to that skin (with a higher stiffness). The shell section that I have created is...
