Impact analysis using pressure as input instead of velocity

Teja_21569
Teja_21569 Altair Community Member
edited October 2020 in Community Q&A

Hello,

 

I am working on project which involve in impact analysis. I want to find stress generated when a plastic plunger hits a metal plate. I have rough calculation of initial velocity.

 

I want go with Force as input,

 

Can i go with pressure  instead of initial velocity

 

Thanks in advance

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Answers

  • Simon Križnik
    Simon Križnik Altair Community Member
    edited August 2018

    Hi Teja,

     

    simulating impact problems with force or pressure instead of initial velocity is not the most realistic or simple IMHO.

    You would have to define the variation of force or pressure as a function of time during the whole impact event. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018
    Altair Forum User said:

    Hi Teja,

     

    simulating impact problems with force or pressure instead of initial velocity is not the most realistic or simple IMHO.

     You would have to define the variation of force or pressure as a function of time during the whole impact event. 

    Agree

     

    Altair Forum User said:

     You would have to define the variation of force or pressure as a function of time during the whole impact event. 

    You may have to do some backend calculations

  • Teja_21569
    Teja_21569 Altair Community Member
    edited August 2018
    Altair Forum User said:

    You may have to do some backend calculations

    Hello, 

     

    How can i define the pressure or force with respective time. Can you Please explain in detail.

     

    I can find pressure can be defined using surface.

     

    Thanks in advance

  • Teja_21569
    Teja_21569 Altair Community Member
    edited August 2018

    Hello prakash sir,

     

    Can i select the surface of plastic plunger which will strike the steel body and apply pressure on that surface, this will solve the problem or not  

     

    thanks in advance

     

     

    image.png.fe4842bd8ebd821f6b0edeb3fd94e3f2.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018
    Altair Forum User said:

    Hello, 

     

    How can i define the pressure or force with respective time. Can you Please explain in detail.

     

    I can find pressure can be defined using surface.

     

    Thanks in advance

    HI,

     

    You can apply pressure using BCs manager and using the Pressure vs time curve. 

    <?xml version="1.0" encoding="UTF-8"?>pressure_radioss.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018
    Altair Forum User said:

    Hello prakash sir,

     

    Can i select the surface of plastic plunger which will strike the steel body and apply pressure on that surface, this will solve the problem or not  

     

    thanks in advance

     

     

    <?xml version="1.0" encoding="UTF-8"?>image.png.fe4842bd8ebd821f6b0edeb3fd94e3f2.png

    So you apply a velocity on the plunger which will impact the steel body correct?

    If yes, I don't see a problem.

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