### elastic moduli as determined by shock

### 448 Structures Under Shock and Impact - WIT Press

Modeling of shock and impact behaviors of aluminum oxide A.M. Rajendran & D.J. Grove U.S. Army Research Laboratory MD Abstract Aluminum oxide (AD995) is a leading candidate material in ceramic armor applications. The density of this material is 3.8 ~ 3.9 gm/cm^ with a porosity of about 2 percent. Its bulk and shear moduli are 231 and 156 GPa

### Anelastic behaviour of FexO at high pressure - NASA/ADS

Elastic moduli can be determined from pressure-volume relations (static or shock-wave compression), from acoustic waves velocity measurements (ultrasonic interferometry), or from dispersion curves of acoustic phonon branches (neutron, x-ray or light inelastic scattering). Anomalous elastic behavior of polycrystalline Nb2O5determined with a dilatometer from room temperature to 1000°C. shock resistance of materials are elastic modulus and thermal expansion coefficient. The data presented in this investiga tures , elastic moduli of crystalline ceramics decrease one percent with each increase of 100°C." This has been experi

### Apparatus to determine static and dynamic elastic moduli

Oct 01, 1984 · 1. The apparatus makes it possible to concurrently measureE S andE D of cylindrical rock specimens under triaxial conditions in theNX Hoek cell. 2. Accuracy of the apparatus is comparable to usual dynamic modulus testing. 3. Preliminary test results for one particular rock type, show that under triaxial conditions the differences betweenE D andE S are smaller at high confining pressures than Effective elastic moduli and characterization of a Jan 01, 1994 · The analytical results are then compared with elastic moduli determined from non-destructive ultrasonic wave-speed measurements of SiC-particle-reinforced titanium-matrix composites produced by shock-wave consolidation.

### Fifth-degree elastic energy for predictive continuum

Nonlinear, anisotropic elastic properties of single crystals determine material response to extreme loading, e.g., in shock waves, under high static pressure, and in defect-free crystals and First-Principles Determination of Elastic Anisotropy and The individual elastic constants of magnesium oxide (MgO) have been determined throughout Earth's lower mantle (LM) pressure-temperature regime with density functional perturbation theory. It is shown that temperature effects on seismic observables (density, velocities, and anisotropy) are monotonically suppressed with increasing pressure. Therefore, at realistic LM conditions, the isotropic

### Flexural Vibration Test of a Beam Elastically Restrained

- AbstractIntroductionTheoretical BackgroundPrinciples of OperationResults and DiscussionSummaryAcknowledgmentA new vibration beam technique for the fast determination of the dynamic Young modulus is developed. The method is based on measuring the resonant frequency of flexural vibrations of a partially restrained rectangular beam. The strip-shaped specimen fixed at one end to a force sensor and free at the other forms the Euler Bernoulli cantilever beam with linear and torsion spring on the fixed end. The beam is subjected to free bending vibrations by simply releasing it from a flexural position and its dynamic respoStatic and Dynamic Mechanical Properties of Organic dynamic elastic parameters and investigation of the correla-tions of rock static and dynamic properties are meaningful and necessary. The laboratory measurements of rock mechanical properties include ultrasonic velocity tests from which the dynamic elastic parameter can be determined as well as direct strength tests including compressive tests and
High pressure elasticity and thermal properties of Comparison of laboratory elasticity data with seismic measurements of the Earth provides a means to understand the deep interior. In this work, elastic wave velocities have been measured under shock compression to 80 GPa in an Fe-Cr-Ni alloy, to 27 GPa in polycrystalline MgO, and to 81 GPa in molybdenum preheated to 1400[degrees]C.
### Impulse Excitation Technique:Study of Elastic and Damping

The standards ASTM-E1876-99, ENV 843-2 and ASTM-C1259-08 provide different guidelines for dimensions of rectangular specimens to obtain a reliable elastic modulus:1. Ratio of length to thickness shall have a value of at least 5 (ASTM) or 10 (ENV). However Journal of Physics:Conference Series PAPER OPEN shock waves. For aluminum and copper, the results of calculations are compared with the experimental data available for high energy densities; a close match is observed. 1. Introduction The elastic-plastic problem is solved using the equations of conservation of mass, impulse and energy.

### Longitudinal elastic velocities in MgO to 360 KB

The first is an elastic phase, traveling at the local compres- sional wave velocity [(Ks + #)/p]/2 (where Ks and # are the isentropic bulk and shear moduli and p is density) in the high- pressure shocked region with an amplitude determined, in principle, by the maximum shear stress supportable by the material. Measurement of release wave speed in shock shock wave data provides a critical series of tests to determine the range of compressions over which the low-pressure elastic moduli and their pressure and temperature derivatives may be reliably applied and to determine the relative merits of various formulations of finite strain theory. The pressure dependence

### Multifunctional composites for elastic and electromagnetic

Apr 21, 2020 · We establish accurate microstructure-dependent cross-property relations for composite materials that link effective elastic and electromagnetic wave characteristics to one another, including effective wave speeds and attenuation coefficients. Our microstructure-dependent formulas enable us to explore the multifunctional wave characteristics of a broad class of disordered microstructures ROCK PHYSICS BASICS - Stanford EarthStatic and Dynamic Moduli Log Strain Stress 10-7 10-2 DYNAMIC STATIC Load Unload By definition, the dynamic moduli of rock are those calculated from the elastic-wave velocity and density. The static moduli are those directly measured in a deformational experiment. The static and dynamic moduli of the same rock may significantly differ from each

### Shock compression of aluminum single crystals to 70 GPa

The measured longitudinal elastic moduli at the highest stress represent more than a fourfold increase from the ambient value and showed continuing anisotropy with compression. The present findings show that Hugoniots may not be the optimal measure of crystalline anisotropy, and even low-anisotropy single crystals, like Al, can manifest significant anisotropy in elastic moduli at large shock compressions. <P /> Strength and elasticity of iron and copper at high shock The elastic and strength parameters of iron and copper were determined experimentally at high shock-wave compression pressures of 12 Mbar. The attenuation of shock waves created by the impact of thin plates in blocks of the investigated materials was recorded in the experiments. The Poisson ratios, bulk moduli, shear moduli, and yield strength Y for iron at 1.11 and 1.85 Mbar and for copper

### Systematic exploration of the mechanical properties of 13

This includes improved shear stiffness and shock absorption, isotropic and linear materials can be uniquely determined by any two elastic moduli. Relations between the elastic moduli and the plastic properties of polycrystalline pure metals, The London, Ventricular elastic modulus as a function of age in the By relating, with justification, the left ventricle to a thin-walled elastic sphere, ventricular elastic moduli, E, for different ages were compared at constant levels of myocardial wall stress, sigma. The elastic modulus E proved to be a linear function of sigma. The slope of the E-sigma plot yielded a stiffness constant, K, for each age group.

### Y. M. Gupta's research works Washington State University

Y. M. Gupta's 313 research works with 5,457 citations and 6,749 reads, including:Elastic moduli of hexagonal diamond and cubic diamond formed under shock compression [Effect of hypertonic saline solution on the shock for 90 minutes. 4 ml/kg NS, HS and HSA was given intravenously and respectively in 5 minutes following hemorrhagic shock. The blood was collected to determine the viscoelasticities of erythrocyte membrane at baseline, shock and after treatment. The results showed that the elastic moduli and viscous

### Phys. Rev. B 103, L100101 (2021) - Elastic moduli of

Mar 08, 2021 · Longitudinal moduli. Experimentally determined diamond moduli are shown as solid symbols and moduli reported for HOPG below the transition are shown as open symbols. For comparison with the present experimental results, the dashed line shows cubic diamond (CD) [100] moduli calculated from second and third order elastic constants.