Fy and Fu from a tensile test.
Fy and Fu from a tensile test.
(OP)
Can anyone remind me why the Fy derived from tensile tests (ie, not a compression test) is used in the design of compression members for mild/high strength steels? Does this go back to the material being isotropic and sharing a yield value regardless of tension or compression stresses? Recall that the design of hot rolled steel compression members is governed by Fy and E.
Thanks
Thanks






RE: Fy and Fu from a tensile test.
RE: Fy and Fu from a tensile test.
RE: Fy and Fu from a tensile test.
I'd say it's basically what you said in your first post - since we know tensile and compressive yield are the same, we can test either one, so we do whatever test is easiest.
RE: Fy and Fu from a tensile test.
BA
RE: Fy and Fu from a tensile test.
Compressive Stress: Fy is not used for elastic buckling. Fy is used for inelastic buckling. I believe this is the cause of your question. It's because compression members should never behave as plastic members. Plastic hinges in columns would make them unstable.
The necking behavior which baretired pointed out is interesting. Those stress-strain curves that we studies which fall downward as necking occurs are based on the original cross-section area. If you factor in the reduced cross-section area, the curve continues upward. This is beyond the values used for design though.
RE: Fy and Fu from a tensile test.
"It is imperative Cunth doesn't get his hands on those codes."
RE: Fy and Fu from a tensile test.
Best regards - Al