how to use gap element in transient analysis

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

Hello,

I'm a bit new to FEA, and i stucked while developing my model.

First, i created my model with spring elements in linear static. It was working great.

 

Second, i convert spring elements to the gap element, but it wasn't working properly in linear-static. So i change loadstep linear-static to non-linear quasi-static, because gap element have non-linear parameters(i defined NLPARM card).

 

Third, i wanted to solve my model in transient analysis. I created transient(direct) loadstep, the model is working great, but spring elements behaved linearly like they were in the linear-static loadstep.

 

After that, i wanted to add non-linear parameters to my transient analysis, but i couldn't find how to do it. I tried to Generic loadstep and select SPC, DLOAD, TSTEP and NLPARM in it. Then it gave me some error says:
 

 *** ERROR # 1461 *** in the input data:
 Card 'NLPARM' is not allowed for this subcase type.
 

 How can i define a nonlinear-transient analysis in radioss.By the way, I'm using Bulk Data.


Best regards
Mehmet
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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Hi Mehmet,

     

    have you tried with Geom- non linear (Impl dynamic) as the load case?

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