Specimen size and shape effect in split Hopkinson pressure bar testing

2009 ◽  
Vol 44 (8) ◽  
pp. 689-698 ◽  
Author(s):  
M Pankow ◽  
C Attard ◽  
A M Waas
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Specimen Size ◽  
Shape Effect ◽  
Hopkinson Pressure Bar ◽  
Size And Shape ◽  
Split Hopkinson ◽  
Pressure Bar

Numerical study of the specimen size effect in the split Hopkinson pressure bar tests

1995 ◽  
Vol 30 (18) ◽  
pp. 4720-4725 ◽  
Author(s):  
J. Rodr�guez ◽  
R. Cort�s ◽  
M. A. Mart�nez ◽  
V. S�nchez-G�lvez ◽  
C. Navarro
Keyword(s):  
Size Effect ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Specimen Size ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

The Effect of Specimen Size on the Dynamic Compressive Behaviour of Magnesium Alloy AZ31B

2013 ◽  
Vol 535-536 ◽  
pp. 141-144 ◽  
Author(s):  
Jing Xiao ◽  
Dong Wei Shu
Keyword(s):  
Strain Rate ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Slenderness Ratio ◽  
Specimen Size ◽  
Hopkinson Pressure Bar ◽  
Specimen Diameter ◽  
Split Hopkinson ◽  
Az31b Alloy ◽  
Pressure Bar

The specimen size has always been crucial in defining the materials behaviour and becomes more important when materials are subjected to high rates of loadings. In the current study, the effect of specimen size on the mechanical behaviour of AZ31B alloy has been investigated under dynamic compression using the Split Hopkinson Pressure Bar (SHPB) and results are presented. Specimens were made in different sizes with fixed slenderness ratio (l/d) of 0.5 and with bar to specimen diameter ratio varying between 0.47 and 0.79. When deformed at the same strain rate 1500±50s-1, the smaller specimens give higher stresses and smaller strains. The smaller size specimens give more uniform strain rate as compared to the larger size specimens. However, some spurious oscillations are observed in the stress-strain curves for smaller size specimens. The alloy shows higher hardening behavior for larger size specimen; the hardening exponent n is larger for larger size specimens.

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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