OPTISTRUCT - Contacts

Andy@LamteqSolutions
Andy@LamteqSolutions Altair Community Member
edited October 2020 in Community Q&A

Hi all, 

 

I have a model with multiple contacts and have been using N2S contacts. I've found that in some of my loadcases, these contacts produce excessively and unrealistically high loads. 

I've checked to assure there is a sufficient gap between master and slave components and have even tried changing to S2S, PARAM EXPERTNL CNTSTB... in every case the the contact in question remains an unrealistically high stress or another contact which was previously low force suddenly becomes massive. 

 

The way I set the models up is to select contact surfaces for both slave and master and select slide option, I don't apply any clearance or srchdis values.

 

Anyone any suggestions? Alas I cannot share the model.

 

 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi Andy,

     

    Is the problem converged?

     

    could you please share the .out file and if possible result file using the FTP link?

  • Andy@LamteqSolutions
    Andy@LamteqSolutions Altair Community Member
    edited October 2018

    Dear me I am slow at responding, sorry I hadn't seen your reply.

     

    Alas I can't share the model itself as it is for a client. I can confirm that the problem converged. I can share the out and CNTF file.

     

    Subcase 107, contact pad 3 & 11. I can confirm that the distance between both contact surfaces is 1.75-(1.5+0.005) = 0.245mm  &  2.6-(2.5+0.005) = 0.095mm respectively.

     

    Clearance is set to 0.0mm.

     

    Sorry I can't share more.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2018

    Hi Andy,

     

    I got the out and cntf file. I will check and will reply to you back soon,

     

    Also, I see that there is only one load increment. Can you increase by increasing NINC on NLPARAM and check if this helps?

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