scholarly journals Experimental Study on Wing Crack Behaviours in Dynamic - S tatic Superimposed Stress Field Using Caustics and High - Speed Photography

2014 ◽  
Vol 7 (3) ◽  
pp. 17-23
Author(s):  
L. Y. Yang ◽  
◽  
Q. Sun ◽  
X. N. Zhao ◽  
Y. B. Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Stress Field ◽  
High Speed ◽  
High Speed Photography ◽  
Wing Crack

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

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.

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.

Entrance length effects on the flow features of rectangular liquid jets

2020 ◽  
pp. 095441002096844
Author(s):  
MH Aliyoldashi ◽  
M Tadjfar ◽  
A Jaberi
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Liquid Surface ◽  
Fluid Flows ◽  
Liquid Jets ◽  
High Speed Photography ◽  
Entrance Length ◽  
Flow Features ◽  
Flow Visualizations ◽  
Axis Switching

An experimental study was carried out to investigate the effects of entrance length on the main characteristics of rectangular liquid jets discharged into the stagnant atmosphere. Six rectangular nozzles, all with the same aspect ratio of 3 but with different entrance length ratios ranging from 3.3 to 60 were constructed. The physics of the fluid flows was visualized by the aid of backlight shadowgraph technique and high speed photography. Flow visualizations revealed that in the mid-range of Weber numbers, the perturbations induced over the liquid surface remarkably depended on the entrance length ratio. Moreover, the characteristics of the axis-switching instability of rectangular liquid jets were measured. It was found that axis-switching wavelength was independent of the entrance length, while the amplitude of axis-switching was directly influenced. For entrance length ratios smaller than 10, the amplitude was increased with increase of entrance length, whereas for entrance length ratios higher than 10, this trend was reversed. Measurements of breakup length also showed that the transition of flow regimes was not perceptibly affected by the entrance length.

An Experimental Study of Liquid Entrainment by Expanding Gas

1987 ◽  
Vol 109 (4) ◽  
pp. 436-441
Author(s):  
M. J. Tan ◽  
J. M. Delhaye
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Least Square ◽  
Working Fluid ◽  
High Speed Photography ◽  
Expansion Process ◽  
Entrainment Velocity ◽  
Air Interface ◽  
Interface Displacement ◽  
The Difference

An experimental study of the hydrodynamic aspect of the expansion process in a hypothetical core disruptive accident (HCDA) by means of a shock-tube technique is described. The working fluid pair was water-air. Interface displacement data for shock strengths in the range 0.5–3.0 were obtained by means of high-speed photography. The displacement data are fitted into least-square polynomials in time, which are used to compute accelerations and entrainment velocities. The accelerations thus obtained, which are in the range 950 m/s2−15,000 m/s2, are uniform in time. The entrainment velocities for experiments performed with the circular driven section are consistently higher than those for the experiments performed with the square driven section at the same accelerations. The difference is attributed to the entrainment velocity for the latter case being time-dependent. Furthermore, an upper bound on the rate of entrainment in an HCDA is proposed.

Sign in / Sign up

Export Citation Format

Share Document