scholarly journals Surface shear stress relaxation of silica glass

2019 ◽  
Vol 102 (8) ◽  
pp. 4573-4582 ◽  
Author(s):  
Emily M. Aaldenberg ◽  
Jared S. Aaldenberg ◽  
Thierry A. Blanchet ◽  
Minoru Tomozawa
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Silica Glass ◽  
Surface Shear Stress ◽  
Surface Shear ◽  
Shear Stress Relaxation

Visualization of separation and reattachment in an incident shock-induced interaction

2021 ◽  
pp. 095441002098349
Author(s):  
Yun Jiao ◽  
Chengpeng Wang
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Shear Stress ◽  
Separation Bubble ◽  
Incident Shock ◽  
Incident Shock Wave ◽  
Bottom Wall ◽  
Surface Shear Stress ◽  
Surface Shear ◽  
Oil Flow

An experimental study is conducted on the qualitative visualization of the flow field in separation and reattachment flows induced by an incident shock interaction by several techniques including shear-sensitive liquid crystal coating (SSLCC), oil flow, schlieren, and numerical simulation. The incident shock wave is generated by a wedge in a Mach 2.7 duct flow, where the strength of the interaction is varied from weak to moderate by changing the angle of attack α of the wedge from 8° and 10° to 12°. The stagnation pressure upstream was set to approximately 607.9 kPa. The SSLCC technique was used to visualize the surface flow characteristics and analyze the surface shear stress fields induced by the initial incident shock wave over the bottom wall and sidewall experimentally which resolution is 3500 × 200 pixels, and the numerical simulation was also performed as the supplement for a clearer understanding to the flow field. As a result, surface shear stress over the bottom wall was visualized qualitatively by SSLCC images, and flow features such as separation/reattachment and the variations of position/size of separation bubble with wedge angle were successfully distinguished. Furthermore, analysis of shear stress trend over the bottom wall by a hue value curve indicated that the relative magnitude of shear stress increased significantly downstream of the separation bubble compared with that upstream. The variation trend of shear stress was consistent with the numerical simulation results, and the error of separation position was less than 2 mm. Finally, the three-dimensional schematic of incident shock-induced interaction has been achieved by qualitative summary by multiple techniques, including SSLCC, oil flow, schlieren, and numerical simulation.

Measurement of surface shear stress vectors using liquid crystal coatings

AIAA Journal ◽  
1994 ◽  
Vol 32 (8) ◽  
pp. 1576-1582 ◽  
Author(s):  
Daniel C. Reda ◽  
Joseph J. Muratore
Keyword(s):  
Shear Stress ◽  
Liquid Crystal ◽  
Surface Shear Stress ◽  
Surface Shear

Seismic interpretation theory for an elastic earth

1954 ◽  
Vol 224 (1156) ◽  
pp. 43-63 ◽  
Keyword(s):  
Shear Stress ◽  
Seismic Interpretation ◽  
Elastic Theory ◽  
Static Case ◽  
Surface Shear Stress ◽  
Elastic Parameters ◽  
Surface Shear ◽  
Special Cases ◽  
Present Solution ◽  
Ray Path

The seismic interpretation problem for an isotropic spherical earth is analyzed on the basis of elastic theory, under the assumption that the three independent elastic parameters are unknown continuous functions of the depth. It is shown that solutions for these functions may be obtained in the form of Taylor’s series. The problem is treated for three types of symmetrical excitation conditions on the free surface: (1) a shear source of type p rϕ only; (2) a pressure distribution with vanishing surface shear stress; (3) an excitation consisting of pressure in combination with surface shear stress of type p rθ . In each case the excitation functions are arbitrary functions of time. It is assumed that the associated components of surface displacement over the sphere are known from available observations, as functions of time. Thus, the complete information contained in seismic records is used in the proposed interpretation process, without need of selecting, identifying and assigning arrival times to specific events on the records. The two static elastic parameters may theoretically be determined from observations at a single frequency, including the frequency zero, or static case. The determination of the dynamic elastic parameter requires the use of at least two frequencies. Algebraic checks are obtained by comparing the general solutions with the corresponding results for two special cases in which the elastic parameters vary in a prescribed manner in the interior of the sphere. In both these cases treatment by the classical ray-path method of interpretation is excluded, because the wave velocity decreases with depth. Furthermore, the ray-path method (which is essentially a method of geometrical optics) would fail to distinguish between the two examples in any case, since the velocity function is the same in both, although the elastic parameters differ. In contrast to the valuable ray-path method, the analytical procedures in the present solution of the elastic problem are prohibitively cumbersome. Practical application of elastic theory to the direct interpretation of seismograms requires further development of the theory with probable utilization of modern high-speed computing methods.

Isochronal shear stress relaxation and recovery of bulk and ribbon glassy Pd40Cu30Ni10P20

2009 ◽  
Vol 206 (7) ◽  
pp. 1440-1446 ◽  
Author(s):  
N. T. N. Nguyen ◽  
S. V. Khonik ◽  
V. A. Khonik
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Shear Stress Relaxation

Viscoelastic properties of the central region of porcine temporomandibular joint disc in shear stress-relaxation

2019 ◽  
Vol 93 ◽  
pp. 126-131
Author(s):  
Eva Barrientos ◽  
Fernandez Pelayo ◽  
Eiji Tanaka ◽  
María Jesús Lamela-Rey ◽  
Alfonso Fernández-Canteli
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Temporomandibular Joint ◽  
Central Region ◽  
Viscoelastic Properties ◽  
Temporomandibular Joint Disc ◽  
Shear Stress Relaxation

Study of Shear Stress Relaxation in Well‐Characterized Polymer Liquids

1982 ◽  
Vol 26 (4) ◽  
pp. 359-371 ◽  
Author(s):  
Christine M. Vrentas ◽  
William W. Graessley
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Polymer Liquids ◽  
Shear Stress Relaxation
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