Proof Stress? (1 Viewer)

[SxC]

Hey does anybody know what proof stress is and how do u get it

 

[McLake]

I am not sure that I understand your question ...

 

[inasero]

"Definition: The stress that will cause a specified small, permanent extension of a tensile test piece. Commonly the stress to produce 0.2% extension is quoted in N/mm2 for steel. This value approximates to the yield stress in materials not exhibiting a definite yield point.
"

 

[Xayma]

To find the proof stress, go to the bottom of the stress strain graph until you reach 0.2% extension, then going parallel to the straight line section (the one that goes to the progressive limit) continue until you hit the graph then that stress is its proof stress.

 

[SxC]

ThX

Thanks alot guys