Appraisal of Pulse-Shaping Technique in Split Hopkinson Pressure Bar Tests for Brittle Materials

2010 ◽  
Vol 1 (3) ◽  
pp. 363-390 ◽  
Author(s):  
Y.B. Lu ◽  
Q.M. Li
Keyword(s):  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Brittle Materials ◽  
Hopkinson Pressure Bar ◽  
Shaping Technique ◽  
Split Hopkinson ◽  
Pressure Bar

scholarly journals NUMERICAL MODELLING OF WAVE SHAPES DURING SHPB MEASUREMENT

2019 ◽  
Vol 25 ◽  
pp. 25-31
Author(s):  
Radim Dvořák ◽  
Petr Koudelka ◽  
Tomáš Fíla
Keyword(s):  
Parametric Analysis ◽  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Sensitivity Study ◽  
Hopkinson Pressure Bar ◽  
Pulse Shaper ◽  
Geometric Properties ◽  
Element Size ◽  
Split Hopkinson ◽  
Pressure Bar

The paper aims at the numerical simulation of the wave propagation in compressive Split Hopkinson Pressure Bar (SHPB) experiment. The paper deals with principles of SHPB measurement, optimisation of a numerical model and techniques of pulse shaping. The parametric model of the typical SHPB configuration developed for LS-DYNA environment is introduced and optimised (in terms of element size and distribution) using the sensitivity study. Then, a parametric analysis of a geometric properties of the pulse shaper is carried out to reveal their influence on a shape of the incident pulse. The analysis is algorithmized including the pre- and post-processing routines to enable automated processing of numerical results and comparison with the experimental data. Results of the parametric analysis and the influence of geometric properties of the pulse shaper (diameter, length) on the incident wave are demonstrated.

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

2013 ◽  
Vol 61 (2) ◽  
pp. 459-466 ◽  
Author(s):  
P. Baranowski ◽  
J. Malachowski ◽  
R. Gieleta ◽  
K. Damaziak ◽  
L. Mazurkiewicz ◽  
...  
Keyword(s):  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Numerical Study ◽  
Experimental Tests ◽  
Peak Shape ◽  
Hopkinson Pressure Bar ◽  
Design Variables ◽  
Split Hopkinson ◽  
Pulse Peak ◽  
Pressure Bar

Abstract High strain rate experimental tests are essential in a development process of materials under strongly dynamic conditions. For such a dynamic loading the Split Hopkinson Pressure Bar (SHPB) has been widely used to investigate dynamic behaviour of various materials. It was found that for different materials various shapes of a generated wave are desired. This paper presents a parametric study of Split Hopkinson Pressure Bar in order to find striker’s design variables, which influence the pulse peak shape in the incident bar. With experimental data given it was possible to verify the developed numerical model, which was used for presented investigations. Dynamic numerical simulations were performed using explicit LS-Dyna code with a quasi-optimization process carried out using LS-Opt software in order to find striker’s design variables, which influence the pulse peak shape.

scholarly journals Use of the Kolsky method for dynamic tests of brittle media

2018 ◽  
Vol 174 ◽  
pp. 02022 ◽  
Author(s):  
Anatoliy Bragov ◽  
Leonid Igumnov ◽  
Andrey Lomunov ◽  
Alexander Konstantinov ◽  
Dmitriy Lamzin ◽  
...  
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Dynamic Test ◽  
Brittle Materials ◽  
Fiber Reinforced Concrete ◽  
Dynamic Tests ◽  
Hopkinson Pressure Bar ◽  
Kolsky Method ◽  
Indirect Tension ◽  
Split Hopkinson ◽  
Pressure Bar

The dynamic test techniques used to obtain the mechanical properties of brittle materials are described. The techniques are based on the fundamental Kolsky method using the Split-Hopkinson Pressure Bar. Dynamic tests are characterized by high intensity and short duration and the influence of inertia on their results should be ruled out which is especially important for brittle media. The prerequisites and assumptions presented methods are described to justify the validity of the obtained data. The methods allow to obtain dynamic deformation diagrams at compression, splitting, indirect tension, shear and triaxial stress state and also to determine the ultimate strength, strain and time properties of brittle materials. The techniques are approved in the tests of ceramic bricks, finegrain concrete and fiber-reinforced concrete.

Compression Tests of Polycarbonate under Quasi-Static and Dynamic Loading

2013 ◽  
Vol 442 ◽  
pp. 125-128
Author(s):  
Wen Jun Hu ◽  
Xi Cheng Huang ◽  
Fang Ju Zhang ◽  
Yong Mei Chen
Keyword(s):  
Pulse Shaping ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Static Behavior ◽  
Experimental Conditions ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Static And Dynamic Loading

Strain rate response of polycarbonate was investigated under uniaxial compression at different rates of strain ranging from 0.0001/sec to about 8200/sec and different temperature ranging from 145k to about 423k. A split Hopkinson pressure bar was used to determine the dynamic compressive responses. A pulse-shaping technique was employed in dynamic compression experiment to ensure that valid experimental conditions were satisfied. Results show that, compared with quasi-static behavior, dynamic compression results in significantly higher compressive strengths for polycarbonate materials.

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