if the nylon is small displacement, in the linear range of the material, should not need nonlinear analysis
but in the real world, these are assumptions, the real world is nonlinear and transient
"Need to check the strength of the both flange while in operation."
Can you provide more detail on what you mean by this? Are you wanting to calculate the loads on the bolts? The stress in the flanges?
"so my question is can I use the use nylon gasket properties in static analysis.Will it work Or do i have to go for non-linear anlysis."
A static analysis means that the results are independent of time (as opposed to a dynamic analysis where the results are dependent on time). As such, you can have linear and non-linear static analyses (and linear and non-linear dynamic analyses).
You problem is a static one most likely, so the only question is whether a linear approximation is good enough. It's hard to say with the information you've provided whether this is the case or not. However, if you end up needing to capture contact, large strains, and/or a hyperelastic material model, then you'll need to do a non-linear analysis. Whether you need to capture these effects depends on what you're after results wise.
Hi Jared & Shaun,
Thanks for the reply.
Let me explain my requirement. There is a compressive force is going to act on one flange while other flange is fixed at a location(See the attached pic for reference). I need to check the stress generated on the flange due to bending . And also want to check what would be the compression in the gasket.
My main concern is checking the stress generated on the top flange, while if I can get the deflection in the gasket due to the compression force by running an static run, it would be great. but in case if it is not going to give the exact compression data, I m happy with the stress details only on the top flange.
I am not sure weather it will give me exact deflection or compression in the nylon through linear analysis or not. So i have put my question for you guys. when to consider non-linear ?
Thanks for all the help.
"I am not sure weather it will give me exact deflection or compression in the nylon through linear analysis or not."
why do you think this may be the case
This is just my intuition speaking, as I have never had to work with parts like yours, but if you are worried that you are exceeding the allowable stresses in the top flange, I would expect that the Nylon gasket is being stressed way beyond yield, unless there features in the flanges that limit the compression in the gasket.