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Difference between contact pair and identity boundary pair
Posted 21 nov. 2013, 04:42 UTC−5 Structural Mechanics Version 4.3b 0 Replies
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I am new to Comsol and I was building my model, a cylinder inserted into a closed end sleeve. Load is applied on the top surface of the inner cylinder (like a piston-cylinder configuration). They are two separate objects, so I used 'Form Assembly in Model 1'.
The issue I am confused about is when you define whether it is a contact pair or a identity boundary pair. There are two surfaces on the cylinder contact with the sleeve: bottom surface of cylinder with closed end surface of sleeve, peripheral surface of cylinder with inner surface of the sleeve.
If I am not mistaken, a corresponding boundary condition need to be defined on both contacting surfaces, in 'pair'. There are several options in 'pair': 'contact', 'boundary load', 'fixed constraint', 'free' etc. If I use 'boundary load', it is working, however, when I use 'contact', error appears (results not converge).
Please check the attachment for my model.
I will be glad if someone can help me with this.
Jing
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Hello Jinghua Tang
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