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Smart testing

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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."