Correction Procedure of Wave Signals for a Viscoelastic Split Hopkinson Pressure Bar

Janiszewski, Jacek; Bużantowicz, Witold; Baranowski, Paweł

doi:10.5604/20815891.1195198

Cited by 9 publications

(6 citation statements)

References 20 publications

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“…The successfully applied method for signal extrapolation [ 41 , 42 , 43 , 44 ] is based on spectral analysis based on the Fast Fourier Transform ( FFT ). It consists in determining the damping coefficient and the wavenumber, i.e., the inverse of the wavelength of the spatial frequency, which tells about the number of sinusoidal components per unit length.…”

Section: Methodsmentioning

confidence: 99%

“…There are algorithms that can reduce this phenomenon. The papers [ 41 , 42 , 43 ] describe the procedures allowing for the correction of the signals obtained during the tests. This operation enables the prediction of the shape of the elastic wave at the point where the front of the bar affects the sample on the basis of the signal recorded by the strain gauge at a known distance from this front.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

2022

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Honeycomb aluminum structures are used in energy-absorbing constructions in military, automotive, aerospace and space industries. Especially, the protection against explosives in military vehicles is very important. The paper deals with the study of selected aluminum honeycomb sandwich materials subjected to static and dynamic compressive loading. The used equipment includes: static strength machine, drop hammer and Split Hopkinson Pressure Bar (SHPB). The results show the influence of applied strain rate on the strength properties, especially Plateau stress, of the tested material. In each of the discussed cases, an increase in the value of plateau stresses in the entire strain range was noted with an increase in the strain rate, with an average of 10 to 19%. This increase is mostly visible in the final phase of structure destruction, and considering the geometrical parameters of the samples, the plateau stress increase was about 0.3 MPa between samples with the smallest and largest cell size for the SHPB test and about 0.15 MPa for the drop hammer test.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

2022

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“…For this reason, the bars used must be adapted to the material to be tested. For example, bars made of PMMA are used for soft materials [12]. During the transition from one medium to another, the cross-sectional area over which the wave is transmitted also plays a role.…”

Section: Split Hopkinson Pressure Barmentioning

confidence: 99%

Experimental Investigation of Unidirectional Glass-Fiber-Reinforced Plastics under High Strain Rates

Bieler,

Haller,

Brandt

et al. 2023

Applied Mechanics

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When a vehicle leaves the road, crash barriers stop it and prevent significant damage to the vehicle, its environment, and the occupants. Typically, such protection systems are made of simple steel, but fiber-reinforced composites can efficiently absorb and dissipate the impact energy at high-risk locations. In order to design such protective systems, material parameters under dynamic loading are necessary. Here, split Hopkinson pressure bar tests with unidirectional glass-fiber-reinforced epoxy of 58% glass fiber content are performed. The elastic response at strain rates between 300/s and 700/s in the loading direction parallel and perpendicular to the fiber is determined. From the measured data, a model of the time dependence of the elastic modulus is derived to enable the design engineer to lay out protective systems made of such GFRPs.

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“…The wavenumberk n is related to the wave dispersion. It can be obtained from the calculated phases φ 1n and φ 2n [2], [4].…”

Section: Signal Correctionmentioning

confidence: 99%

“…The striker has a length of 250 mm and a diameter of 20 mm. Now, however, the measured signals must be corrected, since attenuation and dispersion effects are significantly higher in viscoelastic bars, [2]. Fig.…”

Section: The Shpb Experimentsmentioning

confidence: 99%

Correction of Wave Signals for PMMA Split Hopkinson Pressure Bar Setups

Bieler

Weinberg

2021

Proc Appl Math and Mech

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Correction Procedure of Wave Signals for a Viscoelastic Split Hopkinson Pressure Bar

Cited by 9 publications

References 20 publications

Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

Experimental Investigation of Unidirectional Glass-Fiber-Reinforced Plastics under High Strain Rates

Correction of Wave Signals for PMMA Split Hopkinson Pressure Bar Setups

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