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Equibiaxial Test for Rubber

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Posts: 8
Topic starter
(@jamal.mousavi)
Active Member
Joined: 9 years ago

Hello Friends,

I want to ask a quastion about rubber tests. I have uniaxial test results (Forces-Displacements). And I have biaxial tension test results. However I have a problem about biaxial test :p . I have these values for biaxial test data(look attachment pic). How can obtain biaxial behaviour of this material? Please help me about this isssue.

I know only F values and &#916,l(Lfinal and Lfirst)

You can see the known results in this pic.

[url] http://hizliresim.com/8DnjXW [/url]

Thank you so much for your answer.

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Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

It would be better if you also know the local strain in the middle of the specimen. You can do that using Digital Image Correlation (DIC).
You can also use your experimental test results as part of an inverse calibration approach.

-Jorgen

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3 Replies
Posts: 8
Topic starter
(@jamal.mousavi)
Active Member
Joined: 9 years ago

[QUOTE=Jorgen,13489]It would be better if you also know the local strain in the middle of the specimen. You can do that using Digital Image Correlation (DIC).
You can also use your experimental test results as part of an inverse calibration approach.

-Jorgen

Thank you so much for your answer Mr. Bergstrom

But exactly, you said our problem 🙁 Our equibiaxial tensile test mechanism has no suitable place for DIC device. So I have no local strain results for the middle of the specimen. I want to ask a question:

- Can I apply any superposition principle for this test? Because our biaxial specimen exposures uniaxial tensile strain and biaxial tensile strain, does not it?

Thank you in advance
Yours sincerely

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Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

I suspect that will not be quite accurate. You can always examine that in more detail by running FE simulations of your experimental setup.

-Jorgen

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