What is difference between yield strength & 0.2 proof stress?

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Tags

1. #deformation
2. #occurs
3. #nonlinear
4. #point
5. #offset
6. #stress
7. #material
8. #begins
9. #deform
10. #whereas
11. #yield
12. #elastic
13. #which
14. #plastically
15. #strength
16. #where
17. #proof
18. #plastic
19. #defined
20. #property