graphs

for all graphs, "X" marks the end of the hookes law region.

 

1. = stress/strain for non-strain aging material like copper, aluminum, stainless steel, etc.

 

2. = s/s for strain aging like mild steel.

 

3. = s/s for metal that's deformed, relaxed, then deformed again. it "springs back" down the hookes law line, and will follow that same line back up too.

 

4. = a material that follows hookes law up, but not down in relaxation - as is supposed by jobst brant when he declares that "springback is evidence of residual stress". no material like this exists to my knowledge.

Done