![]() ![]() ![]() the primary assumption is the volume remains the same as you deform it in an actual test, you can't get the gage section to deform this way (that is, the gage section necks non uniformly). You compute true stress and true strain using a specious assumption, that your relationship between engineering stress and true stress is known-you are assuming the coupon necks down in a well defined way, but in reality, that assumption degrades quickly as the stress/strain curve continues to bend over.
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