An Experimental Study of Accelerated Cavitation Induced by Ultrasonics

1965 ◽  
Vol 87 (4) ◽  
pp. 967-976 ◽  
Author(s):  
F. Numachi
Keyword(s):  
Experimental Study ◽  
Frequency Spectrum ◽  
High Speed ◽  
Present Report ◽  
Ultrasonic Waves ◽  
High Speed Photography ◽  
Air Bubbles ◽  
The Waves

With a view to clarifying cavitation phenomena induced by ultrasonic waves, utilized recently in erosion tests, the frequency spectrum of the waves caused by cavitation was obtained, and the pattern of air bubbles produced were observed by high-speed photography. Some considerations also are given in the present report on the amount and form of erosion caused by cavitation.

Experimental Study on the Fiber Motion in the Nozzle of Vortex Spinning via High-Speed Photography

2012 ◽  
Vol 9 (2) ◽  
pp. 117-135 ◽  
Author(s):  
Zeguang Pei ◽  
Ge Chen ◽  
Chao Liu ◽  
Qihong Zhou ◽  
Chongwen Yu ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
High Speed Photography ◽  
Fiber Motion

Modeling of Fabric Impact With High Speed Imaging and Nickel-Chromium Wires Validation

2011 ◽  
Vol 78 (5) ◽  
Author(s):  
Sidney Chocron ◽  
Trenton Kirchdoerfer ◽  
Nikki King ◽  
Christopher J. Freitas
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Numerical Models ◽  
Single Layer ◽  
Diagnostic Techniques ◽  
High Speed Photography ◽  
High Speed Imaging ◽  
Nickel Chromium ◽  
Validation Set ◽  
The Waves

Ballistic tests were performed on single-yarn, single-layer and ten-layer targets of Kevlar® KM2 (600 and 850 denier), Dyneema® SK-65 and PBO® (500 denier). The objective was to develop data for validation of numerical models so, multiple diagnostic techniques were used: (1) ultra-high speed photography, (2) high-speed video and (3) nickel-chromium wire technique. These techniques allowed thorough validation of the numerical models through five different paths. The first validation set was at the yarn level, where the transverse wave propagation obtained with analytical and numerical simulations was compared to that obtained in the experiments. The second validation path was at the single-layer level: the propagation of the pyramidal wave observed with the high speed camera was compared to the numerical simulations. The third validation consisted of comparing, for the targets with ten layers, the pyramid apex and diagonal positions from tests and simulations. The fourth validation, which is probably the most relevant, consisted of comparing the numerical and experimental ballistic limits. Finally for the fifth validation set, nickel-chromium wires were used to record electronically the waves propagating in the fabrics. It is shown that for the three materials the waves recorded during the tests match well the waves predicted by the numerical model.

Experimental Study of Dynamic Fracture Behavior of PVB Laminated Glass by High-Speed Photography

2010 ◽  
Vol 34-35 ◽  
pp. 636-640 ◽  
Author(s):  
Meng Yi Zhu ◽  
Bo Han Liu ◽  
Yue Ting Sun ◽  
Jun Xu ◽  
Xue Feng Yao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Dynamic Fracture ◽  
Crack Velocity ◽  
High Speed ◽  
Fracture Behavior ◽  
High Speed Photography ◽  
Laminated Glass ◽  
Fracture Characteristics ◽  
Photography Method

The dynamic fracture behavior of PVB laminated glass during impact has been studied by both theoretic and finite element approaches. To make the analysis of cracking on PVB laminated glass more accurate and direct, high-speed photography method is introduced in this paper. Different crack patterns as well as their sequences of appearance are visualized. Finally, typical crack is measured in order to obtain important fracture characteristics such as crack velocity and acceleration.

Experimental study on oblique water entry of projectiles

2016 ◽  
Vol 30 (28) ◽  
pp. 1650348 ◽  
Author(s):  
Chenggong Zhao ◽  
Cong Wang ◽  
Yingjie Wei ◽  
Xiaoshi Zhang ◽  
Tiezhi Sun
Keyword(s):  
Experimental Study ◽  
Impact Velocity ◽  
High Speed ◽  
Transition Point ◽  
Water Entry ◽  
High Speed Photography ◽  
Initial Water ◽  
Before And After ◽  
Velocity Attenuation ◽  
Cavity Evolution

An experimental study of oblique water entry of projectiles with different noses has been conducted using high-speed photography technology. The images of the initial water entry impact, cavity evolution, and the closure and shedding of vortices of cavity are presented in the paper. The results reveal that for high-speed oblique water entry (the initial impact velocity [Formula: see text][Formula: see text]50 m/s), the cavity attached to the projectile is symmetrical and free from the influence of gravity. The shedding of the water–vapor–air mixture in the tail of the cavity produces vortices which disappear in the rear of the projectile trajectory. Particular attention is given to the velocity attenuation of the projectile after water entry. The results show that there is a transition point at the time corresponding to the surface seal of the cavity during the velocity attenuation after oblique water entry, and the rates of velocity attenuation are different before and after this transition point. Additionally, the chronophotography of the cavity evolution shows that the time when the surface seal of the cavity occurs decreases with the increase of the initial impact velocity of the projectile.

Observations of radiations forces effects on individual air bubbles with high speed photography

2004 ◽  
Author(s):  
P. Palanchon ◽  
P. Tortoli ◽  
M. Corsi ◽  
A. Bouakaz ◽  
M. Versluis ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Photography ◽  
Air Bubbles

High speed photography of ultrasonic waves excited by impact

Ultrasonics ◽  
1969 ◽  
Vol 7 (2) ◽  
pp. 118-120 ◽  
Author(s):  
E. Häusler ◽  
W. Stumm
Keyword(s):  
High Speed ◽  
Ultrasonic Waves ◽  
High Speed Photography
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