Determination of Detonation Wave Velocities

1968 ◽  
Vol 39 (8) ◽  
pp. 1092-1093 ◽  
Author(s):  
F. J. Steffes ◽  
J. R. Bowen
Keyword(s):  
Detonation Wave ◽  
Wave Velocities

scholarly journals Increasing contribution of grain boundary compliance to polycrystalline ice elasticity as temperature increases

2018 ◽  
Vol 64 (246) ◽  
pp. 669-674
Author(s):  
COLIN M. SAYERS
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Orientation Distribution ◽  
Resonant Ultrasound Spectroscopy ◽  
Wave Velocities ◽  
Polycrystalline Ice ◽  
Resonant Ultrasound ◽  
Increasing Temperature ◽  
Shear Compliance

ABSTRACTMeasured elastic stiffnesses of ice polycrystals decrease with increasing temperature due to a decrease in grain boundary stiffness with increasing temperature. In this paper, we represent grain boundaries as imperfectly bonded interfaces, across which traction is continuous, but displacement may be discontinuous. We express the additional compliance due to grain boundaries in terms of a second-rank and a fourth-rank tensor, which quantify the effect on elastic wave velocities of the orientation distribution as well as the normal and shear compliances of the grain boundaries. Measurement of the elastic stiffnesses allows determination of the components of these tensors. Application of the method to resonant ultrasound spectroscopy measurements made on ice polycrystals enables determination of the ratio BN/BS of the normal to shear compliance of the grain boundaries, which are found to be more compliant in shear than in compression. The ratio BN/BS is small at low temperatures, but increases as temperature increases, implying that the normal compliance increases relative to the shear compliance as temperature increases.

Determination of ignition thresholds of laser supported combustion wave and detonation wave based on piezoelectric probe

2011 ◽  
Vol 23 (9) ◽  
pp. 2305-2308
Author(s):  
高翔 Gao Xiang ◽  
冯国英 Feng Guoying ◽  
朱海涛 Zhu Haitao ◽  
杨火木 Yang Huomu ◽  
唐淳 Tang Chun ◽  
...  
Keyword(s):  
Detonation Wave ◽  
Combustion Wave

Measuring shear and compression wave velocities of soil using bender–extender elements

2009 ◽  
Vol 46 (7) ◽  
pp. 792-812 ◽  
Author(s):  
E. C. Leong ◽  
J. Cahyadi ◽  
H. Rahardjo
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Compression Wave ◽  
Small Strain ◽  
Reliable Determination ◽  
Digital Oscilloscope ◽  
Compression Waves ◽  
Wave Velocities

Piezoceramic elements have been used for laboratory measurement of wave velocity in soil and rock specimens. Shear-wave piezoceramic elements (bender elements) are commonly used to measure shear wave velocity for the determination of small-strain shear modulus. Compression-wave piezoceramic elements (extender elements), on the other hand, are less commonly used as compression wave velocity is less frequently measured. In this paper, the performance of a pair of bender–extender elements for the determination of both shear and compression wave velocities is examined with respect to the resolution of the recorder, bender–extender element size. and excitation voltage frequency. The evaluation showed that the performance of the bender–extender elements test can be improved by considering the following conditions: (i) the digital oscilloscope used to record the bender–extender element signals should have a high analog to digital (A/D) conversion resolution; (ii) the size of the bender–extender elements plays an important role in the strength and quality of the receiver signal, especially for compression waves; and (iii) using a wave path length to wavelength ratio of 3.33 enables a more reliable determination of shear wave velocity.

DETERMINATION OF THE ELASTIC CONSTANTS OF AN ISOTROPIC SOLID USING A “PLATE” VELOCITY MEASUREMENT

Geophysics ◽  
1966 ◽  
Vol 31 (5) ◽  
pp. 984-986 ◽  
Author(s):  
Ernest A. Kaarsberg
Keyword(s):  
Shear Wave ◽  
Elastic Constants ◽  
High Frequency ◽  
Velocity Measurement ◽  
Infinite Plate ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Plate Velocity ◽  
Isotropic Solid

From the longitudinal and shear wave velocities measured in a solid, all of its elastic constants can be determined. Jamieson and Hoskins (1963) have shown how shear wave velocities can be measured in solids with an arrangement which converts high frequency longitudinal wave pulses from axially polarized ceramic transducers into shear wave pulses. This note illustrates how such elastic constants can also be determined with the aid of longitudinal “infinite plate” velocities.

Determination of shear wave velocities in “soft” formations

1983 ◽  
Author(s):  
C. H. Cheng ◽  
M. Nafi Toksöz ◽  
Kenneth M. Tubman
Keyword(s):  
Shear Wave ◽  
Wave Velocities ◽  
Shear Wave Velocities

Determination of shear wave velocities in sediment deposits

2017 ◽  
Vol 13 (6) ◽  
pp. 630-640
Author(s):  
E. Steiakakis ◽  
A. Lazaropoulos ◽  
A. Vafidis ◽  
Z. Agioutantis ◽  
G. Kritikakis
Keyword(s):  
Shear Wave ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Sediment Deposits
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