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Smart testing


bhernandez
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(@bhernandez)
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Hi, 

When you talk about "Smart testing", the fourth proposal is a strain controlled experiment with increasing strain amplitude (*).

In this experiment, tensile and compression states are applied. My question is, what is the sample used to that end? What is its geometry?

(*) "In each cycle, the strain is held constant for a short amount of time allowing for some stress relaxation. Another interesting feature of this test is that the stress goes to both tension and compression, which can be quite useful for material models calibration since the yield stress is often higher in compression than in tension."

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Jorgen
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As long as the applied strains are relatively small, you can use a "thick" tensile dogbone-shaped specimens (which shorter gauge length). You should be able to determine if the deformations are uniaxial using DIC.

/Jorgen

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bhernandez
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(@bhernandez)
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Thanks a lot for your feedback, Jorgen. 

I still wonder if a dogbone sample may cause troubles under compression load, because the sample will be buckled. I would appreciate your opinion on that.

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jbRektor
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That sounds like a great FE study. A tension specimen will not buckle directly, it takes a certain strain for that. All of that can be analyzed using a parametric FE study. Post your results here if you do it!

/Jorgen

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