(6) The
yield points occurred at approximately 0.002 rad/m in most cases.
After the stress overcomes the
yield point, the number of pinning sites substantially increases with the increase in the dislocation density, thus weakening the strength of the magnetic field, as indicated in (6).
QAS-2 had influence obviously on the inhibitive property, rheological properties and filtrate loss of the mud systems before and after adding the shale inhibitive additives, indicating that quaternary ammonium inhibitor can effectively restrain the bentonite slurry, but apparent viscosity,
yield point, dynamic plastic ratio and API filtration of polymer drilling fluid with QAS-2 were significantly increased at the room temperature, due to flocculation effect of organic amine, and QAS-2 can effectively improve the temperature resistance of modified starch.
In this phase, the AE signal and the number of events increase sharply, with a jump in the vicinity of the
yield point. This is shown as a steep change of slope in the accumulation curve and a sharp increase in the magnitude of the spectra of the acoustic signal.
The
yield point is nice to know because it represents an upper performance limit for very short-term behavior.
The yield strengths of the UNS S17400 stainless steel are much lower, and the material exhibits extensive
yield point elongation absent in 17-4PH stainless steel.
A geostatistical analysis was also performed with
yield points, tree gap density and chemical attributes of the soil using the VESPER 1.6 software (University of Sydney, Sydney, NSW, AU) to obtain semivariograms and their parameters--nugget effect (C0), sill (C1) and range (A1).
Permanent deformation of a metal occurs only when the stress exceeds the elastic limit or
yield point. The
yield point for steel and nickel and similar alloys is greater than anyone could accomplish by hand with normal spoons.
