material behavior of styrene-acrylic copolymer

[lwn]

Dear All:

do you have any knowladge about the material behavior of styrene-acrylic copolymer with di-acid esters and inorganic filler? Which model will be suitable for it?

In addition, do you know behavior of styrene-ethylene/butylene-styrene?

Thank you.

David

[Jorgen]

Those are very specific materials. Have you talked to the manufacturer? Do you have actual samples of these materials?

The best material model for these materials will depend on a number of factors:
:arrow: What temperature range are you interested in?
:arrow: What strain levels are you interested in?
:arrow: What type of behavior are you interested in? Fatigue, monotonic loading, failure, ageing, etc?

- Jorgen

[lwn]

Hi, Jorgen:

Thank you.

The strain range is about 40% to 150%. It is mainly shear strain. I am interested in failure of the material.

Polymer material is characterized by viscosity. How can we determine the failure strength? It should be rate-dependent, isn't it? Bascally, which kind of test will be better to obtain the failur strength?

Thank you again.

David

[Jorgen]

I recommend that you perform double shear-lap test or torsion tests. I would also perform the tests at conditions that are as close as possible to the real application. I suggest that you test the material to failure at different rates to investigate the rate-dependence of failure. Note, for many polymers, failure is surprisingly weakly dependent on the deformation rate.

- Jorgen