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Reduction of internal energy in the composite cabinet subjected to rollover testing

Wisawanart

Dear Altair support team,

Recently, I am carrying out the rollover simulation for the ambulance cabinet made of sandwich composite panels.

The result illustrates that the cabinet structure seems to be considerably stiff like a rigid.

When taking a look into the energy plot, I am wondering about the decreasing of internal energy (IE) as shown in the figure below.

Why does the IE reduce? Is it possible to be an effect of the failure criteria in the composite mat. (MAT/M25_COMPSH) used in the model ?

best regards

NUT

Model.png

Picture1.png

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v2020.1

Accepted answers

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Dhanasharee Jadhav_20562

Hi Wisawanart,

I think it is because of material Properties Definition.

Regards,

Dhanasharee Jadhav

Andy_20955

Hi,

Based on the energy plot and without knowing more about the model, my opinion is the initial kinetic energy becomes internal energy as the material is deformed. After the impact, some of the energy absorbed by elastic deformation becomes kinetic energy again as the material goes back towards it original shape. The internal energy due to plastic deformation cannot be recovered again.

Thanks,

Andy