Compliance value

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

Hello, 

My name is Michal,

 

I would like to ask you how can I understand value of compliance in .out file of the optistruct?

If i understand compliance correctly it is displacement of the object when a unit of force is applied.

In my model I have mm, N, MPa, kg as units, but value of compliance of my model is 3e03, epsilon equal 5e-011. 

And the model is definitely not deforming by 3 meters while 1N of force is applied.

 

Do I misunderstand the compliance or its unit? How to transform it into stiffness- normally it is 1/C right?

 

Best regards,

Michal

image.png.67ea7cf444e843dd0eb992c4662ea1d6.png

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Please, could you help me? 

    I want to compare different concepts between each other and using this value would be very useful : )

     

    Best regards,
    Michal

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hi Michal,

     

    Compliance is calculated as:

    <?xml version="1.0" encoding="UTF-8"?>comp.PNG

     

    Where f= KX

     

    Compliance is a direct measure of stiffness for a structure with an applied displacement is constant.