Distinguishing between Elastic and Plastic Internal Energy

Autumn

Hi,

I am running an impact simulation between a rigid plate and a lattice material and am attempting to distinguish between elastic and plastic absorbed energy in the material, but it seems as though I can only look at the total internal energy (which I assume has both plastic and elastic components). Is there any way to "split" the internal energy into the elastic and plastic portions when looking at the part / material as a whole? Or perhaps there's an alternative way to calculate the elastic and plastic internal energies over time using data from either the T01 and/or .h3d files?

(The model was created in Hypermesh, run through Radioss, and I am using HyperView/HyperGraph to post-process).

Rogerio Nakano_21179

Hi

there is not an output from the solver that contains only elastic strain. the IE is deformation energy.

I do not know the complexities on an 3D model, but considering an analogy for a simple one 1d tensile model:

the elastic energy on that element , on a given time, would be some like below (please excuse the lack of math rigorous):

ELE_e = IE_e - 0.5*([S]*[Sigma_e]):[Sigma_e] ,

 

where IE_e is the element total internal energy, S is the compliance matrix

and Sigma_e is the stress tensor.

 

I hope this is helpful.

Regards

Rogerio Nakano_21179

Hi

there is not an output from the solver that contains only elastic strain. the IE is deformation energy.

I do not know the complexities on an 3D model, but considering an analogy for a simple one 1d tensile model:

the elastic energy on that element , on a given time, would be some like below (please excuse the lack of math rigorous):

ELE_e = IE_e - 0.5*([S]*[Sigma_e]):[Sigma_e] ,

 

where IE_e is the element total internal energy, S is the compliance matrix

and Sigma_e is the stress tensor.

 

I hope this is helpful.

Regards