Measurements of Elastic Properties of Geomaterials in Laboratory Compression Tests

1994 ◽  
Vol 17 (1) ◽  
pp. 80 ◽  
Author(s):  
HJ Pincus ◽  
F Tatsuoka ◽  
T Sato ◽  
C-S Park ◽  
Y-S Kim ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Compression Tests

Elastic and pseudoviscous properties of coal under quasi-static and impact loadings

1984 ◽  
Vol 21 (2) ◽  
pp. 203-212 ◽  
Author(s):  
J. R. Klepaczko ◽  
T. R. Hsu ◽  
M. N. Bassim
Keyword(s):  
Strain Rate ◽  
Elastic Properties ◽  
Viscoelastic Properties ◽  
Viscoelastic Model ◽  
Rate Sensitivity ◽  
Bedding Plane ◽  
Strain Rates ◽  
Compression Tests ◽  
Wide Range ◽  
Coefficient Of Viscosity

An investigation of the elastic and viscoelastic properties of Nova Scotia coal was carried out over a wide range of strain rates (quasi-static to impact). High resolution stress–strain diagrams for the coal were obtained from compression tests for the lower and medium strain rates up to [Formula: see text] and with the split Hopkinson bar technique for the high strain rate region up to [Formula: see text].The elastic properties of the coal showed a moderate rate sensitivity at low and moderate strain rates.Above the strain rate [Formula: see text] both Young's modulus and the stress level of microcracking initiation σf0isplayed extreme rate sensitivity and was found to be a linear function of strain rate. The associated coefficient of viscosity perpendicular to the bedding plane was η* = 3.08 × 104 Pa∙s.The viscoelastic model so determined can be used to assess the elastic properties of coal at even higher strain rates, a situation that is similar to an explosive loading. Keywords: coal, strain rates, dynamic, viscoelastic properties.

scholarly journals Elastic Properties of Cerium Oxide Nanocubes from In Situ TEM Compression Tests and DFT+U Simulations

2018 ◽  
Vol 24 (S1) ◽  
pp. 1818-1819
Author(s):  
Lucile Joly-Pottuz ◽  
Thierry Epicier ◽  
Tristan Albaret ◽  
Manuel Cobian ◽  
Douglas D. Stauffer ◽  
...  
Keyword(s):  
Cerium Oxide ◽  
Elastic Properties ◽  
In Situ Tem ◽  
Compression Tests

The Elastic Properties of a Dense Glacial Till Deposit

1965 ◽  
Vol 2 (2) ◽  
pp. 116-128 ◽  
Author(s):  
Earle J Klohn
Keyword(s):  
Elastic Properties ◽  
Modulus Of Elasticity ◽  
Elastic Solid ◽  
Strength Properties ◽  
Glacial Till ◽  
Triaxial Tests ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Sample Disturbance

Dense, heavily preconsolidated glacial till is a relatively incompressible soil that occurs throughout most of Canada. When loaded, it undergoes very small settlement, most of which is elastic. For the average structure, these elastic compressions are too small to be of concern and are usually ignored. However, for some structures they can be critical and their magnitude must be estimated prior to construction. To make the necessary analyses requires knowledge of the elastic properties of the in situ glacial till.This paper presents the results of field and laboratory tests that were made on a dense glacial till deposit to determine its modulus of elasticity, in connection with the design and construction of a 100 ft. high combined earth and concrete dam. In the field, in situ loading tests were made against the walls of a 50 ft. deep test shaft. The modulus of elasticity was computed, using elastic equations applicable to the case of a rigid circular plate pressed against a semi-infinite elastic solid. Moreover, during construction of the project, measurements were made of the elastic rebounds and settlements that occurred under known conditions of unloading and loading. Steinbrenner’s approximate solution for computing settlement due to loads acting on the surface of an elastic layer was then used to compute the apparent modulus of elasticity. In the laboratory, unconfined compression tests and repetitive triaxial tests were made on undisturbed samples. The modulus of elasticity was estimated from the stress-strain relationships obtained.The data presented in the paper indicate that the apparent, in situ modulus of elasticity of the glacial till deposit is very high, being in the order of 150,000 lb./sq. in. Reasonable agreement exists between modulus of elasticity values computed from the in situ plate bearing tests and those computed from observed rebounds and settlements. However, modulus of elasticity values computed from unconfined compression and repetitive triaxial tests in the laboratory are apparently too small, being only a fraction of those values obtained by the field procedures. Sample disturbance is thought to be a major factor affecting laboratory test results.Grain size characteristics, density, natural water content, and strength properties of the glacial till deposit are presented in the paper. These data provide a comprehensive description of the material and permit comparison with glacial till deposits encountered at other areas.

Quantitative evaluation of elasticity of lower orbicularis oris muscle during the lip closing measurement using sonographic elastography

2020 ◽  
Vol 31 (6) ◽  
pp. 361-371
Author(s):  
Sachiko Hayashi-Sakai ◽  
Taichi Kobayashi ◽  
Makoto Sakamoto ◽  
Takafumi Hayashi ◽  
Yusuke Morise ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Intraclass Correlation ◽  
Strain Ratio ◽  
Muscle Performance ◽  
Compression Tests ◽  
Compression Load ◽  
Tension Load ◽  
Closing Force ◽  
Orbicularis Oris Muscle ◽  
Sonographic Elastography

BACKGROUND: Lip closing functions have never been evaluated from the viewpoint of elastic properties. OBJECTIVES: The purpose of the present study was to investigate the behavior of the lower orbicularis oris muscle during a button-pull exercise to measure lip closing force and quantitatively evaluate its elastic properties using sonographic elastography. METHODS: Appropriate compression loads for elastography were randomly measured on one of three types of acoustic couplers on three examiners. Compression tests were performed on three types of acoustic couplers within the appropriate compression load. Using the acoustic coupler with the lowest elastic modulus, the strain ratio of the lower orbicularis oris muscle during lip closing was measured, and elastography was performed on six males under tension loads of 0–8 N. RESULTS: The intraclass correlation coefficient (1, 3) for the tension load of 0 N was 0.81. Elastography showed that the strain ratio values increased significantly (p < 0.05) as the tension load increased. CONCLUSIONS: Combining the data obtained from lip closing test devices and sonographic elastography enabled the muscle performance to be evaluated objectively and accurately.

ELASTIC PROPERTIES OF SINGLE CRYSTALS OF ANHYDRITE

1965 ◽  
Vol 2 (6) ◽  
pp. 673-683 ◽  
Author(s):  
W. M. Schwerdtner ◽  
J. C.-M. Tou ◽  
P. B. Hertz
Keyword(s):  
Single Crystals ◽  
Elastic Properties ◽  
Uniaxial Compression ◽  
Electrical Resistance ◽  
Strain Gauges ◽  
Compression Tests ◽  
Polycrystalline Aggregates

The nine moduli of compliance for anhydrite were obtained in uniaxial compression tests. The displacements were measured by strain gauges of an electrical resistance variety (Budd MetalFilm). Geophysical constants for the polycrystalline aggregates were also computed.

scholarly journals Mechanical properties of nacre constituents and their impact on mechanical performance

2006 ◽  
Vol 21 (8) ◽  
pp. 1977-1986 ◽  
Author(s):  
François Barthelat ◽  
Chun-Ming Li ◽  
Claudia Comi ◽  
Horacio D. Espinosa
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Model ◽  
Single Crystal ◽  
Elastic Properties ◽  
Mechanical Performance ◽  
Element Model ◽  
Compression Tests ◽  
Red Abalone

The mechanical properties of nacre constituents from red abalone were investigated. Electron microscopy studies revealed that the tablets are composed of single-crystal aragonite with nanograin inclusions. Both nanoasperities and aragonite bridges are present within the interfaces between the tablets. By means of nanoindentation and axial compression tests, we identified single tablet elastic and inelastic properties. The elastic properties are very similar to those of single-crystal aragonite. However, their strength is higher than previously reported values for aragonite. A finite element model of the interface accounting for nanoasperities and the identified properties revealed that the nanoasperities are strong enough to withstand climbing and resist tablet sliding, at least over the initial stages of deformation. Furthermore, it was observed that the model over-predicts strength and under-predicts ductility. Therefore, we conclude that other interface features must be responsible for the enhanced performance of nacre over its constituents.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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