polymer property

[PEEK]

Hello to all,

how to approach the analysis using polymer material compared to steel materials.

1. what r the assumptions & other properties we should consider.

2. For all polymer materials, linear analysis is not useful. we must always do non linear with material stress strain curve. Is it 100% true.

3. Is there any internet material to learn something.

Thank you very much in advance for your valuable reply.

PEEK

[ashu28]

Hi,
Two of the key features would be:
1. The plastic deformation (strain softening and strain hardening), which is characteristic of polymeric materials.
2. The dependancy of material properties on temperature.

Although, one generally goes for a non linear analysis, it depends upon the conditions you want to simulate.

There is a lot of work done in the field of polymeric materials, some of which you can easily find free on internet.

Hope it helps

Ashu

[Grant]

Plastic (unrecoverable) deformation is not important for most analyses with polymers.

What you need to focus on is whether viscoelastic (time-dependent recovery) or nonlinear elastic effects are important.

I agree that temperature effects are usually important.

PEEK, based on your posts, I would suggest that you familiarize yourself with the theory of viscoelastic materials and exact solutions of idealized problems before trying to solve any practical problems.

[PEEK]

Hello,

Thanks for ur replies. I read for all plastic materials stress is not proportional to strain which leads to nonlinear analysis. Could you explain further.

Grant, i accept ur suggestion and thanks.

PEEK