Proof stress and yielding behaviour

[helloy]

Discuss how well the proof stress describes a material’s yielding behaviour. Explain why we use
proof stress as a measure of yielding.

 

[Astronuc]

This looks like a homework problem or classroom assignment.

Please explain one's understanding of 'proof stress' and 'yielding'.

Is one familiar with the elastic range of a material and Young's (elastic) modulus?

 

[esajwani1987]

I have the same question as above.

How does the propf stress describes the yielding behaviour and why do we use the proof stress as a measure of yielding.

i would be really thankful if someone can give me the answer or some hints. thank you !