Numerical study for determination of pulse shaping design variables in SHPB apparatus

Baranowski, Paweł; Małachowski, Jerzy; Gieleta, Roman; Damaziak, Krzysztof; Mazurkiewicz, Łukasz; Kołodziejczyk, D.

doi:10.2478/bpasts-2013-0045

“…Also, Lee and Park [32] have presented a pulseshaping technique for investigating the dynamic deformation behavior of bovine femur specimens. Baranowski et al [33] have presented a parametric study of the Split-Hopkinson pressure bar to elaborate the striker's design variables, which influence the pulse peak shape produced by the incident bar. In experiments on cortical bone with viscoelastic properties, Bekker et al [34] have presented a conically shaped striker.…”

Section: Introductionmentioning

confidence: 99%

Constant Strain Rate Uniaxial Compression of Green Sandstone during SHPB Tests Driven by Pendulum Hammer

Li

¹

,

Zhu

²

,

Niu

³

et al. 2017

Shock and Vibration

5

1

0

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During the Split-Hopkinson pressure bar (SHPB) tests driven by pendulum hammer, employing a proper special shape striker is an effective way to obtain dynamic stress equilibrium condition and to get constant strain rate of the rock specimen. To find the proper special shape striker, a striker with a cambered surface was introduced and eight geometrically different hammers were designed to analyze the effect of hammer geometry on the waveform of excited incident stress waves. Based on experiments and simulations, parameter effects, including the cambered hammer curvature radius and hammer diameter, length, and impact velocity, on the incident wave shape were examined. These parametric studies provided guidelines for achieving constant strain rates in rock specimens during SHPB tests. The use of different diameter hammers was noted for shaping stress-time curves to follow the stress-strain behavior of green sandstone. Finally, to examine the applicability of using hammer geometry for shaping incident waves to achieve constant strain rate, SHPB tests on green sandstone specimens were conducted. The results demonstrated that a constant strain rate (100 s −1 ) lasting for 70 s was achieved with the 8# hammer (3.7 kg; curvature radius, diameter, and length of 100, 70, and 126.3 mm, resp.). In addition, dynamic experiments on green sandstone were carried out under various strain rates and the results showed that the initial tangential modulus was almost unaffected by strain rate. The strain at peak stress tended to increase with rising strain rate and the dynamic strength of green sandstone showed an apparent rate dependency.

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“…Naghdabadi et al 23 used a thin copper disk as a pulse shaper to study the parameters affecting the incident pulse shape using experiments and simulations. Baranowski et al 24 investigated a different shape striker that is aimed at the optimization of the incident pulse.…”

Section: Introductionmentioning

confidence: 99%

A Method of Restraining the Geometric Dispersion Effect on Split-Hopkinson Pressure Bar by the Modified Striker Bar

Guang-ping

¹

,

Shen

²

,

Chang

³

et al. 2015

Exp Techniques

0

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In order to restrain the geometric dispersion effect of the stress-wave propagation on conventional split-Hopkinson pressure bar (SHPB), the modified striker bar in Hopkinson bar-loaded test system is selected. Both the experiments and the simulation using ANSYS/LS-DYNA finite element method (FEM) were performed to investigate the modified effect. After verifying the effectiveness of the used program, six modified geometries of the striker bar were simulated. The optimization results in the simulation were further compared with that of the experiment. It was found that the geometric dispersion effect of the incident pulse under the same loading condition can be restrained effectively by modifying the striker bar. Moreover, the experimental incident pulse has a good agreement with that of the numerical simulation curves. By investigating various cases, several typical incident pulses can be obtained through different modified striker bars, and these modified approaches are simple and easy to be achieved.

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“…Ramírez and Rubio-Gonzalez 21 used the commercial software ANSYS/LS-DYNA to perform the simulation and to analyze the SHPB test and involved both the wave propagation and dispersion (ANSYS, Canonsburg, PA). Baranowski et al 24 investigated a different shape striker that is aimed at the optimization of the incident pulse. Naghdabadi et al 23 used a thin copper disk as a pulse shaper to study the parameters affecting the incident pulse shape using experiments and simulations.…”

Section: Introductionmentioning

confidence: 99%

A Method of Restraining the Geometric Dispersion Effect on Split-Hopkinson Pressure Bar by the Modified Striker Bar

Guang-ping

¹

,

Shen

²

,

Chang

³

et al. 2016

View full text Add to dashboard Cite

In order to restrain the geometric dispersion effect of the stress-wave propagation on conventional split-Hopkinson pressure bar (SHPB), the modified striker bar in Hopkinson bar-loaded test system is selected. Both the experiments and the simulation using ANSYS/LS-DYNA finite element method (FEM) were performed to investigate the modified effect. After verifying the effectiveness of the used program, six modified geometries of the striker bar were simulated. The optimization results in the simulation were further compared with that of the experiment. It was found that the geometric dispersion effect of the incident pulse under the same loading condition can be restrained effectively by modifying the striker bar. Moreover, the experimental incident pulse has a good agreement with that of the numerical simulation curves. By investigating various cases, several typical incident pulses can be obtained through different modified striker bars, and these modified approaches are simple and easy to be achieved.

show abstract

Numerical study for determination of pulse shaping design variables in SHPB apparatus

Cited by 24 publications

References 30 publications

Constant Strain Rate Uniaxial Compression of Green Sandstone during SHPB Tests Driven by Pendulum Hammer

Constant Strain Rate Uniaxial Compression of Green Sandstone during SHPB Tests Driven by Pendulum Hammer

A Method of Restraining the Geometric Dispersion Effect on Split-Hopkinson Pressure Bar by the Modified Striker Bar

A Method of Restraining the Geometric Dispersion Effect on Split-Hopkinson Pressure Bar by the Modified Striker Bar

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