critical shear stress

critical shear stress

[′krid·ə·kəl ′shir‚stres]
(solid-state physics)
The shear stress needed to cause slip in a given direction along a given crystallographic plane of a single crystal.
References in periodicals archive ?
The transition occurs at a critical shear stress, [[sigma].
cr] refers to the elastic critical shear stress in the web, [[sigma].
Mean shear stress was compared to the estimate of critical shear stress for the median particle size to develop an estimate of relative shear stress for the entire mussel bed.
Thus, the specific objectives of this study were to (i) determine the interrill and rill erodibility and critical shear stress of the WEPP model for three clayey Australian soils and compare them to values estimated by WEPP; and (ii) characterise settling velocity of soil aggregates and eroded sediment.
b]) relative to the resistance of the bed to erosion (indexed by the critical shear stress for erosion, [[tau].
Another challenge when extruding fluoropolymer films is their tendency to develop melt fracture at relatively low shear stress values, referred to as critical shear stress.
However, fillers and additives may block the effect of the processing aid and reduce the critical shear stress to unacceptable levels.
It has long been realised that different threshold methods give different values of the critical shear stress for initiation of grain motion.
Comparing the boundary shear stress (t) on the channel bed at bankfull discharge with the critical shear stress (t.
HEC-15 identifies this method to determine the critical shear stress in channels with lining particle diameters greater than four in.
1981; Laursen 1958); this is a bed material discharge equation based on bed and critical shear stress; 2) Yang's 1973 equation for sands (Yang 1973); this is a regression-type bed material discharge equation based on stream power, shear velocity, and critical velocity at incipient of motion; 3) Yang's gravel equation for coarse sand and fine gravel (Yang 1984); this equation has the same foundations as Yang's 1973 equation for sand; and 4) Meyer-Peter and Mueller's (MPM) equation for gravel (Meyer-Peter and Mueller 1948); this is a bed load discharge equation based on critical shear stress.

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