How to Add Separable Slide Contact in Static/Modal Analysis
Hi. I want to perform modal and static analysis on parts which connected each other with bolts (bolts modeled with RBE2). I need those contacts can slide and separable but just contact when they want to penetrate. How is this possible? When I add slide contact it behaves like stick each other but slide. I hope I could explain )
Best Answer
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linear static and modal analysis don't allow separation. They're LINEAR.
when you have a slide contact in these 2 cases, the contact status is calculated from the beginning, and will not change, no matter what.
Your parts might slide each other, but will not separate.
For this to happen, you need a NL loadcase. Separating contact is by definition nonlinear.
You might want to run a NL Transient for example. But as a head-up it is very computationally expensive.
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Altair EmployeeAnswers
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Hi,
In the attached PDF, different Contact Interface Properties in OptiStruct such as STICK, SLIDE, NOSEP, FREEZE (TIE) are clearly explained with images.
Kindly go through it.
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14 hours ago, Koushik Chandrashekhar said:
Hi,
In the attached PDF, different Contact Interface Properties in OptiStruct such as STICK, SLIDE, NOSEP, FREEZE (TIE) are clearly explained with images.
Kindly go through it.
Thanks for that helpful document. But I tried Pcont card with separation yes option, it didn't work. There are two cover which connected each other with bolt.. I added RBE2 at bolt holes.. with only rbe2 model covers separate eachother in modal analysis but when I add pcont (friction = 0, seperation = yes) it slides but doesn't separate on same mod number. I seems like separation yes option doesn't work.
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linear static and modal analysis don't allow separation. They're LINEAR.
when you have a slide contact in these 2 cases, the contact status is calculated from the beginning, and will not change, no matter what.
Your parts might slide each other, but will not separate.
For this to happen, you need a NL loadcase. Separating contact is by definition nonlinear.
You might want to run a NL Transient for example. But as a head-up it is very computationally expensive.
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Altair Forum User said:
Hi. I want to perform modal and static analysis on parts which connected each other with bolts (bolts modeled with RBE2). I need those contacts can slide and separable but just contact when they want to penetrate. How is this possible? When I add slide contact it behaves like stick each other but slide. I hope I could explain )
In your case, you have linear problems. For modal analysis, I would use Tie contact. And for static case, I would use freeze contact. For both cases, you have to keep in mind that the contact status remains the same and the initial contact stiffness of each contact element will depend on the initial contact gap opening distance U0.
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Altair Forum User said:
linear static and modal analysis don't allow separation. They're LINEAR.
when you have a slide contact in these 2 cases, the contact status is calculated from the beginning, and will not change, no matter what.
Your parts might slide each other, but will not separate.
For this to happen, you need a NL loadcase. Separating contact is by definition nonlinear.
You might want to run a NL Transient for example. But as a head-up it is very computationally expensive.
Thank you.. Now it's clear..
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