I want to create high strains up to 4 or 5 on the testing specimen (metal-steel) until the failure. Is there a way to create such strains by using traditional compression equipment?
You can get to large shear strains using a technique like equal-channel angular pressing (ECAP). In this technique, you force the sample through an angled channel, which effectively imposes a shear strain. You could manufacture a die with an angled channel and then use your compression apparatus to force the sample through the die. The nice thing about ECAP is that you can pass your sample through the die multiple times, potentially reaching very large strains.
For a recent review of this technique, see:
Review: Processing of metals by equal-channel angular pressing
M. Furukawa, Z. Horita, M. Nemoto, T. G. Langdon
Journal of Materials Science
June 2001, Volume 36, Issue 12, pp 2835-2843
What do you mean? Most the compression test machines have the ability to increase or decrease the displacement rate of the grip. By changing the displacement rate, the strain rate would change.
You can get to large shear strains using a technique like equal-channel angular pressing (ECAP). In this technique, you force the sample through an angled channel, which effectively imposes a shear strain. You could manufacture a die with an angled channel and then use your compression apparatus to force the sample through the die. The nice thing about ECAP is that you can pass your sample through the die multiple times, potentially reaching very large strains.
For a recent review of this technique, see:
Review: Processing of metals by equal-channel angular pressing
M. Furukawa, Z. Horita, M. Nemoto, T. G. Langdon
Journal of Materials Science
June 2001, Volume 36, Issue 12, pp 2835-2843
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