The cone-and-plate geometry
In the cone-and-plate geometry, the test sample is contained between an upper
rotating cone and a stationary flat plate (see Figure 2.5, upper). In the example
shown, the cone is 40 mm in diameter, with a cone angle of 1° 590 relative to the
.plate, and a truncation of 51 mm
The small cone angle (<4°) ensures that the shear rate is constant throughout
the shearing gap, this being of particular advantage when investigating timedependent
systems because all elements of the sample experience the same
shear history, but the small angle can lead to serious errors arising from
eccentricities and misalignment.
The small gap size dictates the practical constraints for the geometry: a
gap-to-maximum particle (or aggregate) size ratio of >100 is desirable to
ensure the adequate measurement of bulk material properties. This geometry
is, therefore, limited to systems containing small particles or aggregates, and
the strain sensitivity is fixed. Normal stress differences may be determined
from pressure and thrust measurements on the plate.
The form factors for the cone-and-plate geometry are as follows:
Shear stress:
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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