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Recent studies on polyethylene, elastomers, and thermoplastics have revealed that the construction material and surface roughness are two important factors affecting wall slip. In this study, to determine the true rheological behavior of model concentrated suspensions, a multiple‐gap separation method was used in a parallel disk rheometer. The model suspensions studied were poly (methyl methacrylate) particles with an average particle size of 121.2 μm in hydroxyl‐terminated polybutadiene. The aim of this study was to investigate the effect of disk Ra in the range of 0.49–1.51 μm and disk construction material on the wall slip and the true viscosity of the model concentrated suspensions. The wall slip velocity and the viscosity were found to be independent of Ra for particle size‐to‐disk Ra ratios of 80–247. Also, the true viscosity was found not to be affected by the rheometer surface construction material. Glass surfaces resulted in the highest slip velocity, whereas aluminum surfaces resulted in the lowest slip velocity. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3341–3347, 2007 相似文献
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F. Ocakoglu S. Acikalin C. Gokceoglu H. A. Nefeslioglu H. Sonmez 《Bulletin of Engineering Geology and the Environment》2007,66(3):353-360
The paper discusses the possible source fault which resulted in the M
w 6.4 Eskisehir earthquake on February 20, 1956, within the Anatolian complex. This is particularly important in view of the
fact that Eskisehir, built mainly on alluvium, has a population of 500,000. The damage data were reviewed related to the number
of people in the various villages affected. An empirical attenuation equation derived from Anatolian seismicity was applied
to three suspected fault segments and the resultant ground motion rates were statistically compared with the damage data.
A number of equally distributed suspected epicentres on each segment were considered. It is concluded that the earthquake
was probably related to the Kavacik fault
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For especially highly concentrated suspensions, slip at the wall is the controlling phenomenon of their rheological behavior. Upon correction for slip at the wall, concentrated suspensions were observed to have non‐Newtonian behavior. In this study, to determine the true rheological behavior of model concentrated suspensions, “multiple gap separation method” was applied using a parallel‐disk rheometer. The model suspensions studied were polymethyl methacrylate particles having average particle sizes, in the range of 37–231 μm, in hydroxyl terminated polybutadiene. The effects of particle size and solid particle volume fraction on the wall slip and the true viscosity of model concentrated suspensions were investigated. It is observed that, as the volume fraction of particles increased, the wall slip velocity and the viscosity corrected for slip effects also increased. In addition, for model suspensions in which the solid volume fraction was ≥81% of the maximum packing fraction, non‐Newtonian behavior was observed upon wall slip correction. On the other hand, as the particle size increased, the wall slip velocity was observed to increase and the true viscosity was observed to decrease. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 439–448, 2005 相似文献
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