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

Wisawanart
Wisawanart Altair Community Member
edited November 2020 in Community Q&A

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

 

 

 

 

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Answers

  • Dhanasharee Jadhav_20562
    Dhanasharee Jadhav_20562 New Altair Community Member
    edited November 2020

    Hi Wisawanart,

    I think it is because of material Properties Definition. 

    Regards,

    Dhanasharee Jadhav

  • Andy_20955
    Andy_20955 New Altair Community Member
    edited November 2020

    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

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