At 393 K (120[degrees]C), the values of [DELTA][tau] for clockwise twisting and that of the first knee-like yield point
for counterclockwise twisting became almost the same when the specimens were strain aged more than 1.
At the yield point
(strain = 4%), the scattering intensity on the equatorial direction begin to decrease, resulting in four scattering peaks distributing in each quadrant.
From a practical standpoint, the yield point
is difficult to determine from measurement results.
This is due to the fact that the proportional limit and the Yield point
are not coincident and the Yield point
is taken at 0.
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.
This explains why engineers who are used to working with metals are surprised that plastic materials cannot operate as close to their yield point
as metals can.
In this phase, the AE signal and the number of events increase sharply, with a jump in the vicinity of the yield point
The top row of images shows the low-strain behavior, primarily in the region of yield point
If such hand-type deformation were possible then most of our bridges, metal supports, and buildings would be in grave danger of collapse, since the yield point
becomes extremely and miraculously low when brought to the hand of talented performers such as Mr.
RHEO-CLAY: provides a high-inverted yield point
(YP)--plastic viscosity (PV) ratio for improved rate of penetration, optimum hole cleaning, and greater liquid/solids separation efficiency from hydrocyclones--differs from sodium bentonite (montmorillonite) by having lower cation exchange capacity and greater yield in the presence of high hardness (Ca++ / Mg++) and sodium (Na+) values.
Drilling fluid properties including density, yield point
, and viscosity are important factors which greatly affect the magnitude of surge and swab pressures generated during trip--in and trip--out operation respectively.
This behavior also indicates that increasing rates of trinexapac-ethyl moves the maximum yield point