Incorrect Friction Computation

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

Hi,

 

I am using INTER/TYPE7 for contact definition of a piston sliding inside a cylinder. The contact parameters are:

Istf=4, Igap=1, FRIC=0.1, gapmin=0.01, INACTI=6, Ifric=0, Iform = 2. 

 

Please find attached the Resultant normal force and the Resultant Tangential force plot (created by TH/INTER output block). As it can be observed from the plot, the peak normal force is ~12 KN for which the expected tangential force should be 1.2 KN (for mu=0.1). However, the observed resultant tangential force peak is upto ~3 KN.

 

Please resolve this problem. Thanks a ton.

 

Regards,

Sai Phanindra

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

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi Sai,

    As a workaround can you set the Inacti to 0 and Igap to 0 and try running the same.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Thanks for the suggestion. That works. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' /> 

  • jsk459
    jsk459 Altair Community Member
    edited May 2018

    Hi,

     

    i could not able find out the Iedge definition for Type24 contact in 2017.2 version. Could you please help with this ?

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

    @jsk459

     

    I will check and update you soon 

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