Studies on Shock Attenuation in Plastic Materials and Applications in Detonation Wave Shaping

Khurana, Rohit; Gautam, Prakash C.; Rai, Rajwant; Kumar, Anil; Sharma, Ankita; Singh, Manjit

doi:10.1088/1742-6596/377/1/012051

Cited by 11 publications

(5 citation statements)

References 1 publication

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“…The exponential form has been shown to model the dependence of particle velocity (U P ) on the shock velocity (U s ). 55 The trajectories of peak pressure for different pulse durations between s ¼ 29 À 47 ns are shown in Fig. 12(a).…”

Section: A Analysis Of Stress and Temperaturementioning

confidence: 99%

Computational prediction of probabilistic ignition threshold of pressed granular Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) under shock loading

Kim

Miller

Horie

et al. 2016

Journal of Applied Physics

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Section: A Analysis Of Stress and Temperaturementioning

confidence: 99%

Computational prediction of probabilistic ignition threshold of pressed granular Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) under shock loading

Kim

Miller

Horie

et al. 2016

Journal of Applied Physics

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“…is work focused on the effect of Teflon diameter and length on coda waves in vibration waveforms because coda waves in vibration waveforms are significantly attenuated by the Teflon [24]. When the Teflon length is greater than 16.2 cm and the impact height is greater than 30 cm, the frequency range of the first wave is between 420 and 450 Hz in Figure 13(b).…”

Section: Discussionmentioning

confidence: 99%

“…As shown in Figure 2(c), the first wave in the vibration waveform is a Ricker wavelet that is generated by the impact. Coda waves in the vibration waveform are significantly attenuated because the attenuation coefficient of the Teflon is quite large [24]. When vibration waves propagate from the impacted metal to the metal base, the amplitude of the vibration waves is significantly attenuated by the Teflon.…”

Section: Detection Principle Of the Impact Sourcementioning

confidence: 99%

Lithological Interface Detection Using an Impact Source

Jian

et al. 2020

Shock and Vibration

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Early detection of abnormal geological targets during drilling can enhance the safety of petroleum drilling. An impact source equipped with the advantage of long detection distances can recognize lithological interfaces. However, coda waves in the vibration waveform are significant to reflected waves, which are difficult to recognize in the time domain. This paper presents the design of an impact source that includes a hammer, impacted metal, Teflon, and a metal base. With the length and diameter of Teflon kept constant, the effect of the hammer, impacted metal, and metal base on the coda waves was experimentally investigated. According to the preferred metal materials, the effect of the length and diameter of Teflon on coda waves was also experimentally studied. A distance measurement experiment was implemented on 1.2 m sandstone on the basis of the preferred impact source design. The experimental results show that the coda waves are significantly attenuated by the preferred impact source. Moreover, the reflected waves are clearly identified in the time domain. Therefore, the preferred impact source can be used effectively in lithological interface detection.

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“…Stabilised shock velocity (V s ) in the material is representing the bulk sound velocity of the selected material. The initial shock velocity (V s ) and attenuation constant (γ) are dependent on the quantity of explosive used for contact detonation 12 . Minimum dimensions of waveshaper can be calculated using the Eqn (1) if these values corresponding to the same explosive loading conditions as that in the warhead configuration are known.…”

Section: Shockwave Attenuation In Waveshaper Materialsmentioning

confidence: 99%

Shock Wave Behaviour of Polymeric Materials for Detonation Waveshapers

et al. 2021

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This paper discusses the experimental determination of explosive shock attenuation parameters of four different polymers viz., Teflon, Phenol formaldehyde, Polyethylene foam and Polypropylene foam. These polymers are candidate materials for waveshapers in shaped charge warheads. Cylindrical specimens of the polymer materials were subjected to explosive shock loading by the detonation of RDX:Wax (95:5). Shock arrival time was measured using piezo-wafers positioned at known spatial intervals in the specimens. Initial shock velocity, stabilised shock velocity and attenuation constant were determined. These parameters are essential for the design of waveshapers. Foams have better shock attenuating properties compared to solids due to their cellular structure. Polypropylene foam has the highest shock attenuating characteristic among the four materials studied.

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Studies on Shock Attenuation in Plastic Materials and Applications in Detonation Wave Shaping

Cited by 11 publications

References 1 publication

Computational prediction of probabilistic ignition threshold of pressed granular Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) under shock loading

Computational prediction of probabilistic ignition threshold of pressed granular Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) under shock loading

Lithological Interface Detection Using an Impact Source

Shock Wave Behaviour of Polymeric Materials for Detonation Waveshapers

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