p45-kjoint2

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

Hi, 

I want to create a joint between two rigid bodies. so I am using p45-kjoint2 for that. Lets say i have a spherical joint between two rigid cubes. But when i see the results I see different response for the different value of Kn assigned to the kjoint property. I have a 10N force on the slave node of upper cube which should come as it is on the master node of both the cubes. But it seems that the value of stiffness affects the results. 

If i have lower stiffness(Kn~1e4) the upper body rotates around spherical joint without transferrring any force and if i have higher stiffness(kn~1e12) the upper body rotates very less but transfers correct force on the bottom cube.

So what stiffness do i choose to get the correct results?

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Answers

  • prat
    prat Altair Community Member
    edited July 2019

    with a lower stiffness for kjoint property the forces are not coming correctly, but with higher stiffness the upper cube does not rotate much which does not make any sense when we have a spherical joint.Please help

    Regards,

  • tinh
    tinh Altair Community Member
    edited July 2019

    How do you apply 10N? I want to see its curve.

    Is it final (equilibrium) state of model?

  • prat
    prat Altair Community Member
    edited July 2019

    I apply 10N force in ramp fashion from 0ms to 10ms and then keep it constant for both the cases. the only change I have is in the stiffness of the kjoint.

    Yes it is final state but not the equilibrium as there is unbalanced 10N force.

    Regards,

     

  • tinh
    tinh Altair Community Member
    edited July 2019

    Please simulate it until equilibrium state and review forces

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