A New Apparatus to Shear Bulk Materials at Various Rates Under Very High Pressure

1970 ◽  
Vol 92 (1) ◽  
pp. 137-138 ◽  
Author(s):  
A. E. Abey ◽  
H. D. Stromberg
Keyword(s):  
High Pressure ◽  
Plastic Region ◽  
Strain Rates ◽  
Bulk Materials ◽  
Stress Strain ◽  
New Apparatus ◽  
Very High

The apparatus described will shear bulk materials at strain rates from 2 × 10−5/sec to 5 × 10−1/sec while the materials are under nearly hydrostatic pressures. This apparatus gives complete stress-strain curves in the plastic region at pressures from about 10 kbar to approximately 80 kbar. Data on beryllium are given as an example of the type of data available from this apparatus.

Determination of stress-strain characteristics at very high strain rates

1970 ◽  
Vol 10 (9) ◽  
pp. 370-376 ◽  
Author(s):  
C. K. H. Dharan ◽  
F. E. Hauser
Keyword(s):  
High Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Stress Strain ◽  
Very High

An Apparatus for Shearing Bulk Materials at High Temperature, High Pressure, and Various Strain Rates

1971 ◽  
Vol 42 (4) ◽  
pp. 429-431 ◽  
Author(s):  
A. E. Abey ◽  
L. L. Dibley ◽  
E. D. Joslyn ◽  
H. D. Stromberg
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Strain Rates ◽  
Bulk Materials ◽  
High Temperature High Pressure

New Apparatus for the Study of Ion−Molecule Reactions at Very High Pressure (25−700 Torr):  A Turbulent Ion Flow Tube (TIFT) Study of the Reaction of SF6-+ SO2

2000 ◽  
Vol 104 (23) ◽  
pp. 5511-5516 ◽  
Author(s):  
Susan T. Arnold ◽  
John V. Seeley ◽  
John S. Williamson ◽  
Paul L. Mundis ◽  
A. A. Viggiano
Keyword(s):  
High Pressure ◽  
Flow Tube ◽  
Ion Flow ◽  
Ion Molecule Reactions ◽  
New Apparatus ◽  
Very High

Frictionless nanoscale plastic flows of soft solid He-4

2013 ◽  
Vol 91 (3) ◽  
pp. 268-272 ◽  
Author(s):  
Chu W. Kwang-Hua
Keyword(s):  
Activation Energy ◽  
High Pressure ◽  
Activation Volume ◽  
Strain Rates ◽  
High Shear ◽  
Vycor Glass ◽  
Fixed Concentration ◽  
Very High ◽  
Solid He

Possible onset of the quantum plasticity in soft–solid He-4 was discovered recently in 7 nm diameter (Vycor glass) nanopores. Here, by using the transition-state model together with the specific activation energy and activation volume, we investigated the possible frictionless plastic flows of soft–solid He-4 under high pressure in confined nanodomains and we observed a series of sudden changes in the shearing stresses at corresponding very high shear strain rates of (locally amorphous) soft–solid He-4 for different activation volumes considering the role of He-3 impurities. Our calculated critical velocity for a fixed concentration of He-3 quantitatively agrees with recent reported values.

Experimental study of the strength and durability of metal-composite high-pressure tanks

2019 ◽  
Vol 85 (1(I)) ◽  
pp. 49-56 ◽  
Author(s):  
A. M. Lepikhin ◽  
V. V. Moskvichev ◽  
A. E. Burov ◽  
E. V. Aniskovich ◽  
A. P. Cherniaev ◽  
...  
Keyword(s):  
High Pressure ◽  
Strain State ◽  
Full Scale ◽  
Fracture Mechanisms ◽  
Metal Composite ◽  
Test Results ◽  
Stress Strain ◽  
Pneumatic Pressure ◽  
Stress Strain State ◽  
Composite Tank

The results of unique experimental studies of the strength and service life of a metal-composite high-pressure tank are presented. The goal of the study is to analyze the fracture mechanisms and evaluate the strength characteristics of the structure. The methodology included tests of full-scale samples of the tank for durability under short-term static, long-term static and cyclic loading with internal pneumatic pressure. Generalized test results and data of visual measurements, instrumental and acoustic-emission control of deformation processes, accumulation of damages and destruction of full-scale tank samples are presented. Analysis of the strength and stiffness of the structure exposed to internal pneumatic pressure is presented. The types of limiting states of the tanks have been established experimentally. Change in the stress-strain state of the tank under cyclic and prolonged static loading is considered. Specific features of the mechanisms of destruction of a metal-composite tank are determined taking into account the role of strain of the metal liner. The calculated and experimental estimates of the energy potential of destruction and the size of the area affected upon destruction of the tank are presented. Analysis of test results showed that the tank has high strength and resource characteristics that meet the requirements of the design documentation. The results of the experiments are in good agreement with the results of numerical calculations and analysis of the stress-strain state and mechanisms of destruction of the metal-composite tank.

scholarly journals Modelling and simulation of dynamic recrystallization (DRX) in OFHC copper at very high strain rates

2017 ◽  
Author(s):  
G. Testa ◽  
N. Bonora ◽  
A. Ruggiero ◽  
G. Iannitti ◽  
I. Persechino ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
High Strain ◽  
Modelling And Simulation ◽  
Ofhc Copper ◽  
Strain Rates ◽  
High Strain Rates ◽  
Very High

Anion packing density: a universal quantity for both dense and porous crystalline inorganic phases

2002 ◽  
Vol 58 (3) ◽  
pp. 457-462 ◽  
Author(s):  
F. Liebau ◽  
H. Küppers
Keyword(s):  
High Pressure ◽  
Packing Density ◽  
Three Dimensional ◽  
Ionic Radii ◽  
Generalized Framework ◽  
Molal Volumes ◽  
Definition Of ◽  
Anion Packing ◽  
Very High ◽  
Framework Density

To compare densities of inorganic high-pressure phases their molal volumes or specific gravities are usually employed, whereas for zeolites and other microporous materials the so-called framework density, FD, is applied. The definition of FD, which refers only to phases with three-dimensional tetrahedron frameworks, is extended to a `generalized framework density' d f, which is independent of the dimensionality of the framework and the coordination number(s) of the framework cations. In this paper the anion packing density, d ap, is introduced as a new quantity which is not only applicable to any inorganic phase but, in contrast to FD and d f, also allows quantitative comparisons to be made for crystalline inorganic phases of any kind. The anion packing density can readily be calculated if the volume and content of the unit cell and the radii of the anions of a phase are known. From d ap values calculated for high-pressure silica polymorphs studied under very high pressure, it is concluded that Shannon–Prewitt effective ionic radii do not sufficiently take into account the compressibility of the anions.

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