Before revision: The 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.
After revision: 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.