scholarly journals Ultrasound velocities and elastic properties of LICL doped zinc –borate glasses

2018 ◽  
Vol 7 (4.5) ◽  
pp. 580
Author(s):  
D. Vijayatha ◽  
G. Chandrashekaraiah ◽  
R. Viswanatha ◽  
C. Narayana Reddy
Keyword(s):  
Shear Modulus ◽  
Elastic Property ◽  
Elastic Properties ◽  
Elastic Moduli ◽  
Zinc Borate ◽  
Ultra Sound ◽  
Borate Glasses ◽  
Zinc Ions ◽  
Moduli Of Elasticity ◽  
Sound Velocities

Sound velocities and elastic property measurements have been employed to study the strength and rigidity of the structure of ZnO-B2O3 glasses doped with LiCl. Moduli of elasticity such as longitudinal, Young`s , bulk and shear modulus have been calculated using ultra sound velocities such as longitudinal and transverse velocities are measured at a frequency of 10 MHz as function of LiCl concentration. Both sound velocities and elastic moduli decrease with increase of LiCl concentration. The results are discussed in the view of borate network and dual structural role played by the divalent zinc ions present in the network. The results indicate that the Zn+2 ions are likely to occupy network forming positions in this glass system. While LiCl is a typically dissolved in the borate network and Cl- occupy the interstitial positions. 

Temperature Dependences of the Elastic Constants of Precipitation-Hardened Aluminum Alloys 2014 and 2219

1977 ◽  
Vol 99 (2) ◽  
pp. 181-184 ◽  
Author(s):  
D. T. Read ◽  
H. M. Ledbetter
Keyword(s):  
Aluminum Alloys ◽  
Shear Modulus ◽  
Bulk Modulus ◽  
Temperature Dependence ◽  
Elastic Properties ◽  
Elastic Constants ◽  
Ultrasonic Pulse ◽  
Young’S Moduli ◽  
Temperature Dependences ◽  
Sound Velocities

Elastic properties of precipitation-hardened aluminum alloys 2014 and 2219 were studied between 4 and 300 K using ultrasonic pulse techniques. Both the longitudinal and transverse sound velocities were measured. Also reported are the Young’s modulus, shear modulus, bulk modulus, and Poisson’s ratio. For both alloys, the Young’s moduli are about ten percent higher than for unalloyed aluminum, and they increase about ten percent on cooling from 300 to 4 K. All the elastic constants show normal temperature dependence.

Estimation of Local Elastic Moduli of Carbon-Containing Materials by Laser Ultrasound

2018 ◽  
Vol 769 ◽  
pp. 96-101 ◽  
Author(s):  
Ivan A. Shibaev ◽  
Dmitry V. Morozov ◽  
Oleg L. Dudchenko ◽  
Ilya A. Pavlov
Keyword(s):  
Chemical Composition ◽  
Shear Modulus ◽  
Elastic Properties ◽  
Precision Measurement ◽  
Elastic Moduli ◽  
Pyrolytic Graphite ◽  
Shear Waves ◽  
Laser Ultrasound ◽  
Longitudinal And Shear Waves ◽  
Ultrasonic Techniques

The elastic properties of two carbon-containing materials are investigated. Shungite rock is a natural nanocomposite; isotropic pyrolytic graphite is an artificial material. Precision measurement of the local velocities of longitudinal and shear waves propagating in shungite and isotropic pyrographite samples was performed by laser ultrasonic techniques. Young's modulus, the shear modulus and Poisson's ratio are calculated, and the chemical composition of the samples is given.

First-Principles Calculations of the Mechanical and Elastic Properties of 2Hc- and 2Ha-WS2/CrS2 Under Pressure

2016 ◽  
Vol 71 (6) ◽  
pp. 517-524 ◽  
Author(s):  
Hua-Long Jiang ◽  
Song-Hao Jia ◽  
Da-Wei Zhou ◽  
Chun-Ying Pu ◽  
Fei-Wu Zhang ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Elastic Properties ◽  
First Principles ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
First Principles Calculations ◽  
Stability Criteria ◽  
Poisson Coefficient ◽  
Debye Temperatures ◽  
Two Phases

AbstractBy utilizing the first-principles method, the pressure-induced effects on phase transition, mechanical stability, and elastic properties of WS2/CrS2 are investigated in the pressure range from 0 to 80 GPa. Transitions from 2Hc to 2Ha for WS2 and CrS2 are found to occur at 17.5 and 25 GPa, respectively. It is found that both 2Ha and 2Hc phases of WS2 and CrS2 meet the mechanical stability criteria up to 80 GPa, suggesting that those structures are mechanically stable. The bulk and shear modulus anisotropy of the two phases of WS2 and CrS2 decrease rapidly under pressure and, finally, trend to isotropy. With increasing pressure, the elastic moduli (Y, B, and G), sound velocities (vs, vp, vm), and Debye temperatures (Θ) of 2Ha and 2Hc of WS2 and CrS2 increase monotonously. Moreover, the Debye temperature (Θ) of 2Hc phase is higher than that of 2Ha phase for both WS2 and CrS2. The bulk, shear, and Young’s modulus, Poisson coefficient, and brittle/ductile behaviour are estimated. The percentages of anisotropy in compressibility and shear and the ratio of bulk to shear modulus (B/G) are also studied.

The Elastic Modulus of the Temporomandibular Joint Disc from Adult Dogs

1991 ◽  
Vol 70 (12) ◽  
pp. 1545-1548 ◽  
Author(s):  
K. Tanne ◽  
E. Tanaka ◽  
M. Sakuda
Keyword(s):  
Elastic Modulus ◽  
Temporomandibular Joint ◽  
Elastic Properties ◽  
External Force ◽  
Elastic Moduli ◽  
Articular Disc ◽  
Temporomandibular Joint Disc ◽  
Strain Relationship ◽  
Moduli Of Elasticity ◽  
Lateral Area

The present study was designed to measure the elastic properties of temporomandibular joint (TMJ) discs from six adult dogs. Each disc was divided mediolaterally into medial, middle, and lateral parts. Under tension, the articular disc exhibited a non-linear stress-strain relationship, which could be represented as two lines (two moduli of elasticity) connected at a point of stress around 1.5 MPa. These two elastic moduli of the disc were approximately 44 MPa and 92 MPa in the lower- and higher-_stress regions, respectively. Elastic moduli of the articular disc in the middle area were significantly different from that in the lateral area of the disc. The reaction to external force appeared to be different in the medial, middle, and lateral regions of the disc.

Elastic properties of Li+ doped lead zinc borate glasses

2014 ◽  
Author(s):  
R. Rajaramakrishna ◽  
R. Lakshmikantha ◽  
R. V. Anavekar
Keyword(s):  
Elastic Properties ◽  
Zinc Borate ◽  
Borate Glasses ◽  
Lead Zinc

Critical porosity and elastic properties of microporous mixed carbonate-siliciclastic rocks

Geophysics ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. E93-E109 ◽  
Author(s):  
F. Fournier ◽  
J. Borgomano
Keyword(s):  
Elastic Property ◽  
Elastic Properties ◽  
Elastic Moduli ◽  
Critical Porosity ◽  
Cretaceous Rock ◽  
Petrographic Analyses ◽  
Siliciclastic Rocks ◽  
Property Changes ◽  
Steep Slopes ◽  
Mixed Carbonate

By integrating elastic-property measurements and quantitative mineralogic and petrographic analyses of 45 mixed carbonate-siliciclastic samples from two wells drilled in Late Cretaceous rock of the South Provence Basin (southeast France), we can (1) identify and quantify the parameters controlling elastic properties; (2) demonstrate that micrite can be considered as a porous medium with a low critical porosity, averaging 18%; and (3) relate diagenetic transformations, pore-structure modifications, and elastic-property changes. Microporous carbonates with compact anhedral and euhedral microrhombic micrites display a steeper decrease in compressional and shear velocities with increasing porosity than do carbonate rocks with moldic, intergranular, or intercrystalline macroporosity. The low value of critical porosity estimated in micrites (18%), as well as the steep slopes of velocity-porosity relationships at low porosity, is believed to result from a pore-network geometry characterized by very flat, thin pores bounded by planar faces of micrite crystals. Cementation of microrhombic micrite steeply increases elastic moduli, whereas dissolution processes significantly increase porosity with low variations of elastic moduli. Thus, critical-porosity concepts can help describe and model elastic properties of micritic microporous carbonate.

Spectroscopic investigation of zinc borate glasses doped with trivalent europium ions

1996 ◽  
Vol 201 (3) ◽  
pp. 211-221 ◽  
Author(s):  
M. Bettinelli ◽  
A. Speghini ◽  
M. Ferrari ◽  
M. Montagna
Keyword(s):  
Spectroscopic Investigation ◽  
Zinc Borate ◽  
Borate Glasses ◽  
Trivalent Europium

Measurement and Calculation of Elastic Properties in Low Carbon Steel Sheet

2005 ◽  
Vol 495-497 ◽  
pp. 1591-1596 ◽  
Author(s):  
Vladimir Luzin ◽  
S. Banovic ◽  
Thomas Gnäupel-Herold ◽  
Henry Prask ◽  
R.E. Ricker
Keyword(s):  
Carbon Steel ◽  
Elastic Property ◽  
Elastic Properties ◽  
Steel Sheet ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Forming Process ◽  
Element Analysis ◽  
Wide Range ◽  
Carbon Steel Sheet

Low carbon steel (usually in sheet form) has found a wide range of applications in industry due to its high formability. The inner and outer panels of a car body are good examples of such an implementation. While low carbon steel has been used in this application for many decades, a reliable predictive capability of the forming process and “springback” has still not been achieved. NIST has been involved in addressing this and other formability problems for several years. In this paper, texture produced by the in-plane straining and its relationship to springback is reported. Low carbon steel sheet was examined in the as-received condition and after balanced biaxial straining to 25%. This was performed using the Marciniak in-plane stretching test. Both experimental measurements and numerical calculations have been utilized to evaluate anisotropy and evolution of the elastic properties during forming. We employ several techniques for elastic property measurements (dynamic mechanical analysis, static four point bending, mechanical resonance frequency measurements), and several calculation schemes (orientation distribution function averaging, finite element analysis) which are based on texture measurements (neutron diffraction, electron back scattering diffraction). The following objectives are pursued: a) To test a range of different experimental techniques for elastic property measurements in sheet metals; b) To validate numerical calculation methods of the elastic properties by experiments; c) To evaluate elastic property changes (and texture development) during biaxial straining. On the basis of the investigation, recommendations are made for the evaluation of elastic properties in textured sheet metal.

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