Energy dissipation across the front of shock wave in rheological materials filled with second phase inclusions

2006 ◽  
Vol 134 ◽  
pp. 883-887
Author(s):  
Jian-kang Chen ◽  
Jue Zhu
Keyword(s):  
Shock Wave ◽  
Energy Dissipation ◽  
Second Phase

Shaking Table Tests of a Typical Mexican Colonial Temple: Evaluation of Two Retrofitting Techniques

2013 ◽  
Vol 29 (4) ◽  
pp. 1209-1231 ◽  
Author(s):  
Marcos Chávez ◽  
Roberto Meli
Keyword(s):  
Energy Dissipation ◽  
Research Program ◽  
Maximum Intensity ◽  
Shaking Table ◽  
Scale Model ◽  
Stone Masonry ◽  
Significant Source ◽  
Second Phase ◽  
Shaking Table Tests ◽  
Displacement Capacity

This paper reports the results of the second phase of a research program that carried out shaking table tests on a scale model of a typical stone masonry temple. This second phase evaluates the efficacy of two different retrofitting techniques by comparing the response of the retrofitted models with that of the original unreinforced model. It was found that both retrofitting schemes substantially enhanced the performance of the model temple. The maximum intensity of the base motion for which damage was considered to be still repairable increased by 80% and 120% for the first and the second levels of retrofitting, respectively. In terms of displacement capacity, the response of the model with the second level of retrofit reached a maximum drift of 0.4%. The initial damping ratios were found to be in the range of 7% to 9%, both in the original and the retrofitted models. These ratios constitute a significant source of energy dissipation for this kind of structure.

Experimental Research on Shock Wave in Water of Underwater Drilling Blasting

2012 ◽  
Vol 193-194 ◽  
pp. 989-994
Author(s):  
Jian Feng Si ◽  
Dong Wang Zhong ◽  
Lin Na Li
Keyword(s):  
Shock Wave ◽  
Experimental Research ◽  
Theoretical Research ◽  
Second Phase ◽  
Pressure Data ◽  
Total Dosage ◽  
Monitoring Test ◽  
The Law ◽  
Single Dosage

Based on theoretical research, waveform curve of shock wave and the pressure data of underwater group of satchel charges were measured by doing the monitoring test in the waterway dredging project of the second-phase construction in Gulei Xiamen. Characteristics and the law of its propagation of shock wave in water produced by the explosion were analyzed, the conclusion which the single dosage is 110 ~ 500kg while the total dosage is 730 ~ 4710kg and the blasting distance is from 74.5 to 220m was given. Semi-theory-semi-experienced formula of the shock wave on this condition was verified. Much valuable experience has been accumulated for the further research.

Shock Wave Energy Dissipation in Catalyst-Free Poly(dimethylsiloxane) Vitrimers

2020 ◽  
Vol 53 (12) ◽  
pp. 4741-4747 ◽  
Author(s):  
Jaejun Lee ◽  
Brian B. Jing ◽  
Laura E. Porath ◽  
Nancy R. Sottos ◽  
Christopher M. Evans
Keyword(s):  
Shock Wave ◽  
Energy Dissipation ◽  
Wave Energy ◽  
Wave Energy Dissipation ◽  
Catalyst Free ◽  
Shock Wave Energy

scholarly journals Mechanochemistry for shock wave energy dissipation

2017 ◽  
Author(s):  
William L. Shaw ◽  
Yi Ren ◽  
Jeffrey S. Moore ◽  
Dana D. Dlott
Keyword(s):  
Shock Wave ◽  
Energy Dissipation ◽  
Wave Energy ◽  
Wave Energy Dissipation ◽  
Shock Wave Energy

scholarly journals On The Possible Mechanism Of Energy Dissipation In Shock-Wave Fronts Driven Ahead Of Coronal Mass Ejections

2010 ◽  
Author(s):  
M. V. Eselevich ◽  
V. G. Eselevich ◽  
M. Maksimovic ◽  
K. Issautier ◽  
N. Meyer-Vernet ◽  
...  
Keyword(s):  
Shock Wave ◽  
Energy Dissipation ◽  
Coronal Mass Ejections ◽  
Wave Fronts

Microstructure and Damage Evolution of Ceramic Matrix Composite

2006 ◽  
Vol 326-328 ◽  
pp. 1177-1180
Author(s):  
Wen Ge Pan ◽  
Gui Qiong Jiao ◽  
Bo Wang
Keyword(s):  
Energy Dissipation ◽  
Carbon Fiber ◽  
Damage Evolution ◽  
Ceramic Matrix Composite ◽  
Failure Stress ◽  
Fiber Bundles ◽  
Interface Debonding ◽  
Second Phase ◽  
The Third ◽  
Carbon Fiber Bundles

The tensile damage evolution of 2D plain woven C/SiC composites strengthened with 1K and 3K carbon fiber bundles and microstructure’s influence on material’s damage evolution were investigated using the Acoustic Emission technology (AE) and failure observation. Experimental results reveal that damage evolution of these two kinds of composites is a gradual procedure and this procedure consists of three phases. There is no damage during the first phase. During the second phase, the damage, mainly consisting of matrix microcrack cracking, interface debonding of fiber and joining of microcrack, random takes place in the whole area of specimen. During the third damage phase, the damage, mainly consisting of macrocrack cracking, fibers breaking and fibers pulling out, mainly takes place in the local failure area of specimen. Because the microstructures of composites with 1K and 3K carbon fiber bundles are different, their damage mechanisms are different. Composite strengthened with 1K carbon fiber bundles get in second phase at 90% failure stress, and their main energy dissipation occurred during the second damage phase. While Composite strengthened with 3K carbon fiber bundles get in second phase at 80% failure stress, and their main energy dissipation occurred during the third damage phase.

High-Rate Forming: First Paper: Experiments on Clamped Circular Blanks Subject to an Underwater Explosive Charge

1964 ◽  
Vol 179 (1) ◽  
pp. 197-221 ◽  
Author(s):  
W. Johnson ◽  
R. Sowerby
Keyword(s):  
Shock Wave ◽  
Explosive Charge ◽  
Water Surface ◽  
Free Water ◽  
Plastic Work ◽  
Charge Weight ◽  
Second Phase ◽  
Free Water Surface ◽  
Hydrostatic Head ◽  
Work Done

The results of experiments on the dynamic free stretch forming of peripherally clamped circular blanks of brass and mild steel subject to an underwater explosive charge are given for use in connection with studies on explosive metal forming. The results are presented in six parts. part 1: Some results for the effect of hydrostatic head above the charge on the polar deflection suffered by a blank are given and it is shown that for some otherwise fixed sets of parameters, at a depth of about 18 in below the free water surface the polar deflection is greatest. Illustrations of how strain distribution and the plastic work done on a blank vary with hydrostatic head are also given. In particular it is shown that the energy received from an explosive charge by a blank may greatly exceed the fraction expected by reference to the solid angle subtended by the blank at the point charge. With the aid of some blank speed measurements an attempt is made to relate the kinetic energy acquired by the blank to the plastic work done on them. part 2: The measured maximum speed of deformation over the central portion of blanks is shown to be less than 300 ft/sec (rupture excluded). For some circumstances that two phases of motion exist is incontrovertible, and the mechanism responsible for these, we believe, is as follows. In the first phase the speed is dependent upon stand-off distance and is a consequence of the primary shock wave and subsequent cavitation and diffraction effects that occur as a result of the shock wave impinging on the blank. The second phase (arising only with the larger stand-off distances) occurs some time later and may be accompanied by a greater deformation velocity; it is thought to be due to a water hammer or similar effect. part 3: An attempt is made to present generalized results for the maximum polar deflection incurred as a function of both charge weight and hydrostatic head. part 4: This shows how the density of a curtain of air-bubbles, measured by aerator pressure, inserted at the walls of the confining tank reduces the polar deflection or damage a blank may sustain. part 5: A short empty cardboard cylinder (sealed at each end with a layer of polythene) inserted between the blank and charge leads to increased polar deflection, other things remaining the same. part 6: Deals with gas-bubble pulsation and generally confirms the Willis formula, namely, that for charges not too near a free water surface or an underwater blank, the period of oscillation is proportional to (charge weight)1/3 and (the ambient pressure at the charge)−5/6.

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

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