An Experimental Study of the Propagation of Transient Longitudinal Deformations in Elastoplastic Media

1953 ◽  
Vol 20 (3) ◽  
pp. 427-434
Author(s):  
E. J. Sternglass ◽  
D. A. Stuart
Keyword(s):  
Experimental Study ◽  
Strain Rate ◽  
Dynamic Process ◽  
Propagation Velocity ◽  
Wave Shape ◽  
Propagation Process ◽  
Von Karman ◽  
Elastoplastic Media ◽  
Von Kármán ◽  
Shape Changes

Abstract The propagation process of longitudinal plastic pulses in prestrained bars has been studied to test the validity of the Donnell-Taylor-von Kármán theory of plastic waves. The results obtained for the propagation velocity and wave-shape changes indicate that the theory fails to describe the dynamic process by its neglect of strain-rate and creep effects.

scholarly journals Numerical and experimental study of the time-dependent states and the slow dynamics in a von Kármán swirling flow

2009 ◽  
Vol 103 (2-3) ◽  
pp. 163-177 ◽  
Author(s):  
E. Crespo Del Arco ◽  
J. J. Sánchez-Álvarez ◽  
E. Serre ◽  
A. De La Torre ◽  
J. Burguete
Keyword(s):  
Experimental Study ◽  
Swirling Flow ◽  
Time Dependent ◽  
Slow Dynamics ◽  
Von Karman ◽  
Von Kármán

scholarly journals The Benard-Von Karman instability : an experimental study near the threshold

1984 ◽  
Vol 45 (10) ◽  
pp. 483-491 ◽  
Author(s):  
C. Mathis ◽  
M. Provansal ◽  
L. Boyer
Keyword(s):  
Experimental Study ◽  
Von Karman ◽  
Von Kármán

scholarly journals Experimental Study of Fracture Characterizations of Rocks under Dynamic Tension Test with Image Processing

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Dihao Ai ◽  
Yuechao Zhao ◽  
Beijing Xie ◽  
Chengwu Li
Keyword(s):  
Mechanical Properties ◽  
Image Processing ◽  
Crack Propagation ◽  
Strain Rate ◽  
Impact Velocity ◽  
Propagation Velocity ◽  
Dynamic Mechanical Properties ◽  
Propagation Process ◽  
Crack Propagation Velocity ◽  
Crack Propagation Process

To investigate the fracture characterizations of rocks under high strain rate tensile failure, a series of dynamic Brazilian tests was conducted using Split Hopkinson pressure bar (SHPB), and a high-speed digital camera at a frame rate of 50,000 frames per second (FPS) with a resolution of 272 × 512 pixels was adopted to capture the real-time images and visualize the failure processes. Using the extracted cracks and image processing technique, the relationship between loading condition (impact velocity), crack propagation process (crack velocity, crack fractal characteristic, and crack morphological features), and dynamic mechanical properties (absorbed energy and strain-stress parameters) was explored and analyzed. The experimental results indicate that (1) impact velocity plays a critical role in both crack propagation process and dynamic mechanical properties, (2) the crack fractal dimension is positively correlated with crack propagation velocity and has a linear relationship with the proposed morphological feature of crack, (3) mean strain rate and max strain of rocks under SHPB loading both decrease with the increase of crack propagation velocity, and (4) the energy absorbed by the rocks increases with increasing impact velocity and has a strong negative correlation with a proposed novel crack descriptor. Experimental studies pertaining to the measurement of crack propagation path and velocity, in particular, some crack feature extraction approaches, present a promising way to reveal the fracture process and failure mechanisms of rock-like materials.

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