Detecting Proof Stress From Metals

If you want to 'detect' the proof stress from scratch then you will have to perform a tensile test to destruction on a sample of the metal then analyse the stress / strain curve.

Unless you have the required testing machine it is simpler to look up the proof stress in the tables published by various standards - ASTM, ASME, British Standards, or DIN spring to mind.

Hope this helps.

Drew