Learning Forum

[alikuryan]

Hi everyone,

I am running a windshield impactor test in LS-DYNA using *MAT_ELASTIC glass shell elements with *MAT_ADD_EROSION.

The erosion card includes a critical stress, critical strain energy, and critical radius. My understanding is that when a glass element reaches the critical stress, LS-DYNA evaluates the accumulated strain energy within the specified radius around that element. If this accumulated strain energy exceeds the critical energy, the related elements are eroded.

For my study, I want to keep the critical energy very high so that erosion does not occur, and I want to post-process the time history of this  accumulated strain energy during the windshield impact.

However, I cannot find this quantity in the output. I can only see part-level internal_energy from MATSUM, but this is not the local  strain energy I need.

How can I get this strain energy output in LS-DYNA?

Thank you

Ali

[ErKo]

 

 

 

 

Hi

Include DATABASE_EXTENT_BINARY to write strain data.

Then

Open d3plot in LSPP.

Go to FringeComp – > MISC -> strain energy .

So under Fringe plots.

6.4. Post

All the best

Erko

 

 

 

 

[alikuryan]

Hi Erko,

Thank you for your reply.

My aim is to obtain the accumulated strain energy inside the critical radius as a function of impactor displacement, similar to a force-displacement curve in a windshield impact test. I want to investigate how the strain energy in this critical region changes under different simulation conditions.

How can I find or output this strain energy data in LS-DYNA?

Best,
Ali