is defined bywhere is the current specimen length [m] and is the original specimen length [m]. True strain, also known as logarithmic strain or natural strain, provides a more accurate measure of large deformations, such as in materials like ductile metalsThe compressive strength therefore corresponds to the point on the engineering stress-strain curve defined by

where is the load applied just before crushing and is the specimen length just before crushing.

Deviation of engineering stress from true stress

When

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