Crash Analysis with Not Relevant Energy Output

Ashish_MEXPERT
Ashish_MEXPERT Altair Community Member
edited October 2020 in Community Q&A

Hello Guys,

 

I am doing Impact Analysis on a Structure of different Materials like Steel, Alu and Composites by hitting with Impactor of Steel. 

 

After the Impact the structure breaks but then Energy is continuously Increasing which i dont understand why it doesnt reamins constant ?

 

I saw the eroded Internal Energy of my model which is also higher so i think may be this can be the reason or is it anything else possible ?

 

I have attached the Energy Plot file, please let me know if anybody can help me to understand this plot better or f there can be the error in my model.

 

BestRegards,

 

Ashish  

<?xml version="1.0" encoding="UTF-8"?>EnergyPlot.JPG

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    Hi @Ashish_MEXPERT

     

    Could you please share the .out file from starter and engine?

  • Ashish_MEXPERT
    Ashish_MEXPERT Altair Community Member
    edited May 2018

    Hi Prakash,

     

    Thanks for your reply !

     

    I have actually modelled in Hypermesh (LS-Dyna Profile) and calculated it with LS-Dyna solver so i dont have generated out file from Hypermesh Radioss Solver. I wanted to know what can be the reason of this unrealistic energy increase after the structure is breaking.

     

    Thanks !

     

    Regards,

     

    Ashish

  • Nachiket Kadu_22143
    Nachiket Kadu_22143 Altair Community Member
    edited May 2018
    Altair Forum User said:

    Hi Prakash,

     

    Thanks for your reply !

     

    I have actually modelled in Hypermesh (LS-Dyna Profile) and calculated it with LS-Dyna solver so i dont have generated out file from Hypermesh Radioss Solver. I wanted to know what can be the reason of this unrealistic energy increase after the structure is breaking.

     

    Thanks !

     

    Regards,

     

    Ashish

    what erroded internal energy stands for?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    @Ashish_MEXPERT

     

    I would suggest you to contact Dyna support for the same, 

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited June 2018
    Altair Forum User said:

    what erroded internal energy stands for?

    It is the energy associated with deleted elements and deleted nodes .The name is coming from word erosion, which means removal of something.

    Here in impact elements after failure are getting removed or getting deleted.

    It can be internal energy as well as kinetic energy. 

    @Ashish_MEXPERT Can you also plot eroded kinetic energy as internal energy in elements after deletion will almost remain constant as they do not have any more capacity to absorb more based  as they are failed. This is also seen in you graph where A plot is getting constant

Categories