scholarly journals Shear and normal stress measurements in non-Brownian monodisperse and bidisperse suspensions

2016 ◽  
Vol 60 (2) ◽  
pp. 289-296 ◽  
Author(s):  
Chaiwut Gamonpilas ◽  
Jeffrey F. Morris ◽  
Morton M. Denn
Keyword(s):  
Normal Stress ◽  
Stress Measurements ◽  
Bidisperse Suspensions

scholarly journals Rock Stress Measurements for Unlined Pressure Tunnels: A True Triaxial Laboratory Experiment to Investigate the Ability of a Simplified Hydraulic Jacking Test to Assess Fracture Normal Stress

2021 ◽  
Author(s):  
Henki Ødegaard ◽  
Bjørn Nilsen
Keyword(s):  
Normal Stress ◽  
Test Method ◽  
Sudden Increase ◽  
Normal Stresses ◽  
True Triaxial ◽  
Step Rate ◽  
Stress Measurements ◽  
Fracture Closure ◽  
Rate Test ◽  
Hydraulic Jacking

AbstractTo avoid hydraulic failure of unlined pressure tunnels, knowledge of minimum principal stress is needed. Such knowledge is only obtainable from in situ measurements, which are often time-consuming and relatively costly, effectively limiting the number of measurements typically performed. In an effort to enable more stress measurements, the authors propose a simplified and cost-effective stress measuring method; the Rapid Step-Rate Test (RSRT), which is based on existing hydraulic testing methods. To investigate the ability of this test to measure fracture normal stresses in field-like conditions, a true triaxial laboratory test rig has been developed. Hydraulic jacking experiments performed on four granite specimens, each containing a fracture, have been performed. Interpretation of pressure-, flow- and acoustic emission (AE) data has been used to interpret fracture behaviour and to assess fracture normal stresses. Our experimental data suggest that the proposed test method, to a satisfactory degree of reliability, can measure the magnitude of fracture normal stress. In addition, a clear correlation has been found between fracture closure and sudden increase in AE rate, suggesting that AE monitoring during testing can serve as a useful addition to the test. The rapid step-rate test is also considered relevant for field-scale measurements, with only minor adaptions. Our findings suggest that the RSRT can represent a way to get closer to the ideal of performing more testing along the entire length of pressure tunnel, and not only at key locations, which requires interpolation of stress data with varying degree of validity.

Normal Stress Measurements in Low-Elasticity Liquids

Rheology ◽  
1980 ◽  
pp. 163-163
Author(s):  
A. S. Lodge ◽  
T. H. Hou ◽  
P. P. Tong
Keyword(s):  
Normal Stress ◽  
Stress Measurements

Free Surface Effects on Normal Stress Measurements in Cone and Plate Flow

2007 ◽  
Vol 17 (3) ◽  
pp. 36494-1-36494-6 ◽  
Author(s):  
David C. Venerus
Keyword(s):  
Free Surface ◽  
Stress Field ◽  
Normal Stress ◽  
Spherical Shape ◽  
Normal Stress Difference ◽  
Surface Shape ◽  
Stress Difference ◽  
Stress Measurements ◽  
Free Surface Shape ◽  
Normal Stress Differences

Abstract The effects of free surface shape on normal stress difference measurements in cone and plate flow are investigated. The analysis shows that the stress field is significantly altered by deviations of the free surface from an ideal (spherical) shape. For the cone and partitioned plate technique, it is shown how modest deviation from a spherical free surface shape can lead to errors of roughly 10% in the measured normal stress differences.

Sinusoidal normal stress measurements with the weissenberg rheogoniometer

1973 ◽  
Vol 11 (12) ◽  
pp. 2371-2376 ◽  
Author(s):  
Hirokazu Kajiura ◽  
Hiroshi Endo ◽  
Mitsura Nagasawa
Keyword(s):  
Normal Stress ◽  
Weissenberg Rheogoniometer ◽  
Stress Measurements

Normal stress measurements on drag-reducing polymer solutions

1972 ◽  
Vol 11 (2) ◽  
pp. 185-189 ◽  
Author(s):  
D. T. G. Morgan ◽  
K. Pannell
Keyword(s):  
Normal Stress ◽  
Polymer Solutions ◽  
Stress Measurements ◽  
Drag Reducing Polymer
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