Question regarding Springelements

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi all,

 

I want to model a spring with constant force over its elongation. In PROP/TYPE4 I tried to set H1=8, so I can insert a constant function in fctID11(which defines Force vs spring length). When I tried to start my simulation an error occured 'Spring with null stiffness, K has to be bigger than 0'. From my understanding I wouldn't need to define a K-Factor as it's already defined in fctID11..

 

Any ideas on how to model a spring with constant force? Is it possible to give a function for the K-Factor?

 

Regards

Kevin

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    Hi Kevin,

    This approach seems fine.

    I'll check for a simple test model and will share with you.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    Hi George,

     

    But if I enter a stiffness value, the Force will be calculated as F=K*x, in which the Force will not be constant as defined in fctID11. In fact, there would be two diffrent Force values defined at each step if I understand correctly.

    I'm looking forward to your test model.

     

    Kevin

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Hi Kevin,

    You are right, from the function it will calculate.

    II'm attaching a simple model with Type 4 spring. Works fine with H=0 and constant function, sample model is just 1 spring, imposed displacement extension and compression.

    Force remains constant

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    Alright! Thank you very much

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