Wave Dispersion in Cylindrical Tubes: Applications to Hopkinson Pressure Bar Experimental Techniques

2004 ◽  
Author(s):  
Libo Ren ◽  
Mike Larson ◽  
Bazle A. Gama ◽  
John W. Gillespie ◽  
Jr
Keyword(s):  
Wave Dispersion ◽  
Experimental Techniques ◽  
Hopkinson Pressure Bar ◽  
Cylindrical Tubes ◽  
Pressure Bar

scholarly journals Wave Dispersion and Attenuation in Viscoelastic Split Hopkinson Pressure Bar

1998 ◽  
Vol 5 (5-6) ◽  
pp. 307-315 ◽  
Author(s):  
Z.Q. Cheng ◽  
J.R. Crandall ◽  
W.D. Pilkey
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Soft Materials ◽  
Wave Dispersion ◽  
Hopkinson Pressure Bar ◽  
Viscoelastic Wave Propagation ◽  
Split Hopkinson ◽  
Linear Viscoelastic ◽  
Basic Equations ◽  
Pressure Bar ◽  
Dispersion And Attenuation

A viscoelastic split Hopkinson pressure bar intended for testing soft materials with low acoustic impedance is studied. Using one-dimensional linear viscoelastic wave propagation theory, the basic equations have been established for the determination of the stress—strain—strain rate relationship for the tested material. A method, based on the spectral analysis of wave motion and using measured wave signals along the split Hopkinson pressure bar, is developed for the correction of the dispersion and attenuation of viscoelastic waves. Computational simulations are performed to show the feasibility of the method.

Effect of Stress Wave Dispersion on Hopkinson Pressure Bar Loaded Fracture Test

2013 ◽  
Vol 577-578 ◽  
pp. 569-572
Author(s):  
Chun Huan Guo ◽  
Xin Hui Shen ◽  
Feng Chun Jiang ◽  
Guang Ping Zou
Keyword(s):  
Stress Wave ◽  
Pulse Shaping ◽  
Wave Dispersion ◽  
Computational Procedure ◽  
Experimental Results ◽  
Hopkinson Pressure Bar ◽  
Spectroscopy Analysis ◽  
Testing Accuracy ◽  
As Stress ◽  
Pressure Bar

Some fundamental issues, such as stress wave dispersion effect, loss of contact, pulse shaping effect are still needed to thoroughly understand in Hopkinson pressure bar loaded fracture experimental techniques. In order to avoid the influence of stress wave dispersion on the analysis of dynamic experimental results, a computational procedure has been developed based on the combined analytical solution of Pochhammer-Chree with Fourier spectroscopy analysis. The validity of this proposed computational procedure was confirmed via the comparison with the experimental stress pulses obtained from pulse-shaped tests. The experimental results can be easily interpreted and the testing accuracy can be improved using this computational procedure.

Wave Dispersion and Attenuation in Viscoelastic Split Hopkinson Pressure Bar

2013 ◽  
Vol 535-536 ◽  
pp. 547-550
Author(s):  
Hafiz Sana Ullah Butt ◽  
Pu Xue
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Soft Materials ◽  
Wave Dispersion ◽  
Wave Number ◽  
Hopkinson Pressure Bar ◽  
Integer Multiple ◽  
Split Hopkinson ◽  
The Difference ◽  
Pressure Bar ◽  
Dispersion And Attenuation

The Split Hopkinson Pressure Bar (SHPB) is most commonly used facility to obtain material properties at high strain rates. Testing of soft materials using this method requires that bars made of low impedance material should be used, in order to improve signal-to-noise ratio of transmitted stress. However, utilization of such bars poses some difficulties in data processing as the wave dispersion and attenuation becomes noticeable due to their viscoelastic nature. Wave propagation coefficients of a viscoelastic pressure bar are evaluated using incident and reflected strain waves generated through impact of two different length striker bars. Two approaches are proposed for propagation coefficient measurement in this study, namely direct and waves-overlap. Using two approaches, it is found that the calculated attenuation coefficients are same, while the wave numbers are different. The difference in wave number in the case of two approaches is due to the difference in calculated phase change of incident and reflected waves, which is found as integer multiple of 2Π. Moreover, propagation coefficients calculated through different striker impacts are found different. The propagation coefficient found through long striker impact, when used for propagation response prediction of waves generated by short striker impact, resulted in high oscillations in predicted waves.

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

Dispersion Correction for Split-Hopkinson Pressure Bar Data

1988 ◽  
Author(s):  
L. E. Malvern ◽  
D. A. Jenkins ◽  
E. Jerome ◽  
J. C. Gong
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Dispersion Correction ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

scholarly journals Dynamic compressive and splitting tensile tests on mortar using split Hopkinson pressure bar technique

2015 ◽  
Vol 12 (4) ◽  
pp. 730-746 ◽  
Author(s):  
Fei Yang ◽  
Hongwei Ma ◽  
Lin Jing ◽  
Longmao Zhao ◽  
Zhihua Wang
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Tensile Tests ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar
Sign in / Sign up

Export Citation Format

Share Document