Phase Transformation at 240 K in YBa 2 Cu 3 O 7- x by Measurements of Elastic Energy Dissipation and Modulus and its Possible Relation with the Enhancement of T c Above 100 K

1988 ◽  
Vol 6 (3) ◽  
pp. 271-276 ◽  
Author(s):  
G Cannelli ◽  
R Cantelli ◽  
F Cordero ◽  
G. A Costa ◽  
M Ferretti ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Energy Dissipation ◽  
Elastic Energy

Features of elastic energy dissipation in the PdAgH system

1994 ◽  
Vol 211-212 ◽  
pp. 233-236 ◽  
Author(s):  
F.A. Lewis ◽  
R.-A. McNicholl ◽  
A. Biscarini ◽  
B. Coluzzi ◽  
C. Costa ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Elastic Energy

scholarly journals Effects of coal's initial macro-cracks on rockburst tendency of rock–coal composite samples

2019 ◽  
Vol 6 (11) ◽  
pp. 181795 ◽  
Author(s):  
Shaojie Chen ◽  
Dawei Yin ◽  
Huimin Liu ◽  
Bing Chen ◽  
Ning Jiang
Keyword(s):  
Energy Dissipation ◽  
Elastic Energy ◽  
Composite System ◽  
Structural Instability ◽  
Uniaxial Loading ◽  
Test Results ◽  
Compression Tests ◽  
Loading Direction ◽  
Attenuation Index ◽  
Composite Samples

In the present study, uniaxial compression tests were conducted on sandstone–coal composite samples to investigate the effects of original macro-cracks in coal on the rockburst tendency. First, the energy dissipation theory was used to derive the elastic energy attenuation index of composite samples during uniaxial loading. Then, based on the test results obtained, the rockburst tendency of composite samples was evaluated and analysed using the uniaxial compressive strength and elastic energy attenuation index. The results show that the original macro-cracks in coal deteriorated the rockburst tendency of composite samples. The original horizontal cracks had the lowest effect on the rockburst tendency, whereas the vertical penetrating cracks through the coal centre (parallel to the loading direction) displayed the greatest effect. The mechanism by which these macro-cracks weakened the rockburst tendency involved two steps: (i) changing the physical properties and energy accumulation conditions of composite samples and (ii) increasing the energy dissipation of composite samples during uniaxial loading. These aspects are important to understand the rockburst hazards induced by the structural instability and failure of the composite system of coal seam and roof rock during deep coal mining.

scholarly journals The Effect of Confining Pressure and Water Content on Energy Evolution Characteristics of Sandstone under Stepwise Loading and Unloading

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Shuren Wang ◽  
Paul Hagan ◽  
Yanhai Zhao ◽  
Xu Chang ◽  
Ki-Il Song ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Water Content ◽  
Elastic Energy ◽  
Strain Energy ◽  
Confining Pressure ◽  
Triaxial Tests ◽  
Energy Evolution ◽  
Evolution Characteristics ◽  
Loading And Unloading ◽  
Stepwise Loading

To investigate the mechanical properties and energy evolution characteristics of sandstone depending on the water contents and confining pressure, the uniaxial and triaxial tests were conducted. The test results show that the strain energy was stored in the sandstone samples at the prepeak stage, and that is suddenly released when the failure occurred, and energy dissipation is sharply increased at the postpeak stage. The damage and energy dissipation characteristics of the samples are observed clearly under the stepwise loading and unloading process. The critical strain energy and energy dissipation show a clear exponential relationship. The critical elastic energy decreases linearly as the water content increases. As the confining pressure increases, the critical elastic energy of the samples transforms from linear to exponential. The concept of energy enhancement factor is proposed to characterize the strengthening effect induced by the confining pressure on the energy storage capacity of the rock samples. The energy evolution of the sandstone samples is more sensitive to the confining pressure than that of the water content.

Mechanisms of elastic energy dissipation in the transition layer between a coating and a substrate under contact interaction

2014 ◽  
Vol 55 (2) ◽  
pp. 318-326 ◽  
Author(s):  
V. E. Panin ◽  
D. D. Moiseenko ◽  
S. V. Panin ◽  
P. V. Maksimov ◽  
I. G. Goryacheva ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Contact Interaction ◽  
Elastic Energy ◽  
Transition Layer

Nanoindentation Characteristics of Patterned ITO for Multi-Touch Panel

2011 ◽  
Vol 80-81 ◽  
pp. 250-254 ◽  
Author(s):  
Wen Yang Chang ◽  
Cheng Hung Hsu
Keyword(s):  
Plastic Deformation ◽  
Energy Dissipation ◽  
Elastic Energy ◽  
Glass Substrate ◽  
Elastic Response ◽  
Touch Panel ◽  
Contact Areas ◽  
High Impedance ◽  
Mems Fabrication ◽  
Pet Film

Fabrication, nanoindentation characteristics, and optical spectroscopy of patterned ITO for multi-touch panel are investigated. The fabrications were carried out in two parts. The first part fabricates the high/low impedances of ITO patterns on silicon wafer, and the second part sputters the ITO patterns on PET film using MEMS fabrication. The array strips of ITOs on the PET film are defined as contact areas and row electrodes of scanning lines. The ITO patterns on the glass substrate include the contact areas, the narrow wires for high impedance, and the column electrodes of scanning lines for low impedance. The nanoindentation characteristics of load-unload regions generated elastic energy dissipation, which is attributed to higher elastic response, frictional energy, stiffness, and compressive plastic deformation. The maximum transmittance is 74.2% at the wavelength of about 692 nm due to a thicker ITO and Al films.

scholarly journals Some comments on reinforced concrete structures forming column hinge mechanisms

1977 ◽  
Vol 10 (4) ◽  
pp. 186-195 ◽  
Author(s):  
T. E. Kelly
Keyword(s):  
Energy Dissipation ◽  
Computer Program ◽  
Strain Hardening ◽  
Elastic Energy ◽  
Static Loading ◽  
Wall Structure ◽  
Reinforced Concrete Structures ◽  
Base Shear ◽  
Input Design ◽  
Incremental Collapse

Three buildings relying on column hinge mechanisms for post-elastic energy dissipation were studied using an inelastic dynamic computer program. The structures were an eight storey wall structure with ground storey columns, an eight storey frame with rigid, non-yielding beams, and a single storey frame with rigid, non-yielding beams. Parameters varied were earthquake input, design base shear and strain hardening ratio. All structures exhibited deformations far in excess of deflections under code static loading. The eight storey structures showed a tendency towards incremental collapse from P-delta effects when low, probably realistic, strain hardening ratios were used.

scholarly journals Energy dissipation of shock-generated stress waves through phase transformation and plastic deformation in NiTi alloys

2019 ◽  
Vol 137 ◽  
pp. 103090 ◽  
Author(s):  
Fatemeh Yazdandoost ◽  
Omidreza Sadeghi ◽  
Marjan Bakhtiari-Nejad ◽  
Ahmed Elnahhas ◽  
Shima Shahab ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Phase Transformation ◽  
Energy Dissipation ◽  
Stress Waves ◽  
Niti Alloys

ASSESSMENT OF THE INFLUENCE OF R-PHASE FORMATION ON THE MATERIAL BEHAVIOR OF NiTi USING A MICROMECHANICAL MODEL

2012 ◽  
Vol 05 (01) ◽  
pp. 1250015 ◽  
Author(s):  
RAINER HEINEN ◽  
SHORASH MIRO
Keyword(s):  
Phase Transformation ◽  
Energy Dissipation ◽  
Phase Formation ◽  
Energy Minimization ◽  
Micromechanical Model ◽  
Strain Curve ◽  
Material Behavior ◽  
Cell Geometry ◽  
Stress Strain Curve ◽  
Geometrical Change

Shape memory alloys (SMA) show several interesting features in their material behavior which are due to martensitic phase transformation. In NiTi , this transformation covers the three crystallographic phases of austenite, martensite, and R-phase. This publication analyzes the influence of the R-phase formation on the overall material behavior by means of a micromechanical model. The model is based on energy minimization with the assumption of a certain energy dissipation when martensite is formed. To simplify the formulation, the dissipation associated with the transformation between austenite and R-phase is neglected, since the geometrical change in unit cell geometry is relatively small in this case. Numerical simulations show that especially the slope reduction in the stress–strain curve, which is known from experiments, can be explained by R-phase formation.

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