The 3D meso-scale model and numerical tests of split Hopkinson pressure bar of concrete specimen

2018 ◽  
Vol 160 ◽  
pp. 744-764 ◽  
Author(s):  
T.H. Lv ◽  
X.W. Chen ◽  
G. Chen
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Concrete Specimen ◽  
Scale Model ◽  
Hopkinson Pressure Bar ◽  
Numerical Tests ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Meso Scale

Dispersion Investigation in the Split Hopkinson Pressure Bar

1990 ◽  
Vol 112 (3) ◽  
pp. 309-314 ◽  
Author(s):  
J. C. Gong ◽  
L. E. Malvern ◽  
D. A. Jenkins
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Strain Curve ◽  
Concrete Specimen ◽  
Fourier Series Expansion ◽  
Hopkinson Pressure Bar ◽  
Correction Technique ◽  
Split Hopkinson ◽  
Mode Vibration ◽  
Pressure Bar ◽  
Good Agreement

Dispersion of an elastic wave propagating in a 76.2-mm-diameter (3 in.) Split Hopkinson Pressure Bar system was investigated with two consecutive pulses recorded in the transmitter bar. Assuming that the dispersive high frequency oscillatory components riding on the top of the main pulse originate from the first mode vibration, the dispersion was corrected by using the Fast Fourier Transform (FFT) and Fourier series expansion numerical schemes. The good agreement validates the assumption that only the first mode was significant. The dispersion correction technique was employed in a test of a concrete specimen having the same diameter as that of the SHPB. Better agreement of the two specimen-bar interface stresses versus time and fewer oscillations in the stress-strain curve demonstrated advantages of the application of dispersion corrections.

Analysis of the Impact of the Frequency Range of the Tensometer Bridge and Projectile Geometry on the Results of Measurements by the Split Hopkinson Pressure Bar Method

2013 ◽  
Vol 20 (4) ◽  
pp. 555-564 ◽  
Author(s):  
Wojciech Moćko
Keyword(s):  
Test Bench ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Deformation ◽  
Spectral Width ◽  
Hopkinson Pressure Bar ◽  
Computing Environment ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
The Impact ◽  
Bench Model

Abstract The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient

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