YS and UTS for an all weld tensile specimen
YS and UTS for an all weld tensile specimen
(OP)
For a recently tested batch of E71T1(welded as per ASME Section II C requirements), the all weld tensile showed a YS and UTS of 83400psi with 24% elongation. The yield strength was measured by checking the gage length continuously and by the dial on the load readings itself. The material did show necking but after the yield strength was reached there was no increase in the load readings. Can the yield strength and UTS for this material be the same? What could be the possible reasons for such an occurence, I know that the yield load reading might be wrong, but any better ways of arriving at the yield strength? This testing was done on the older type machines where there is no automatic plotting of the stress-strain curve.
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!





RE: YS and UTS for an all weld tensile specimen
In all probability you missed the YS as it "went by". <g>
RE: YS and UTS for an all weld tensile specimen
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!
RE: YS and UTS for an all weld tensile specimen
I may be reading your message wrong, but not all metals have an actual "drop-of-beam" at the YP-where the load actually drops off a little before it increases to the UTS-in fact, many/most steels do not have it.
The area under the curve in the elastic region (before the YP) is very small compared with the area of the plastic region in a tough steel.
RE: YS and UTS for an all weld tensile specimen
Matt Nousak, P.E.
Senior Staff Engineer
Middough Associates Inc.
nousakmj@middough.com
RE: YS and UTS for an all weld tensile specimen
I'm not sure how you expect to measure yield strength by that method, but that is not the correct method. How would you know when you've reached 0.2% permananent deformation? It's not possible to do that visually. How do you know when the curve started to deviate from linearity without a plot of the load vs. elongation? If you're saying that the yield strength is at or just before necking begins, you've measured it well passed the point where it should be.