Reloading effects on plane plates subjected to non-contact underwater explosion

Rajendran, R.

doi:10.1016/j.jmatprotec.2007.12.022

Cited by 22 publications

(14 citation statements)

References 15 publications

(29 reference statements)

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“…The plate velocity for the above explosion configuration is 56.5 m/s. Reloading component of the underwater explosion adds up an impulse equal to that of the primary pulse impulse [24]. Approximating the initial plane surface of the plate for the gas bubble reloading component, the primary shock pulse impulse is doubled (which essentially means that double the primary shock pulse plate velocity is employed for estimating the plate inelastic response.…”

Section: Methodsmentioning

confidence: 99%

“…(6), the lowered natural frequency of the test plate keeps the underwater explosive loading in zero period impulsive loading regime. Rajendran [24] revealed that reloading component of underwater explosive impulse is as much as the primary shock pulse impulse for a depth of submergence of the target equal to or more than twice the stand off. This condition prevails for considerable depth of underwater explosion [25].…”

Section: Explosive Loadingmentioning

confidence: 99%

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Numerical simulation of underwater explosion bulge test

Rajendran

2009

Materials & Design

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Section: Methodsmentioning

confidence: 99%

Section: Explosive Loadingmentioning

confidence: 99%

Numerical simulation of underwater explosion bulge test

Rajendran

2009

Materials & Design

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“…The interaction between the UNEDX shock loading and a structure is very complicated, and usually, the action time of shock wave is very short within a few microseconds while a bubble pulse can usually last for hundreds of microseconds [14]. Since the responses of structure subjected to UNDEX shock wave and bubble loading are totally different, only one part of structure response is studied in some researches.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge experiment and numerical study on the dynamic response of air-backed plate to underwater explosion

Wu¹,

Long²,

Zhong³

et al. 2017

J. vibroeng.

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This work compares experimental and numerical results concerning the elastic dynamic response of air-backed plate to underwater explosion. Experiments were performed in a centrifuge, both the shock loadings and structure responses were tested, and the bubble oscillation considering centrifugal force was predicted with Geer and Hunter model. The experimental and numerical results illustrates that the centrifugal force have no effect on shockwave for the short duration of action, and with the increase of centrifugal force, the bubble pulse motion cycle, maximum bubble radius, and peak pressure of bubble pulse decreased; both the peak of high-frequency and low-frequency response of the plate decline slightly when alpha damping rising ,the high-frequency response mode almost have no change with different alpha damping ,while, the low-frequency response tends to be an obvious oscillation waveform when the alpha damping is too low; although the difference of the peak acceleration owing to shock wave and bubble reaches to tens of times, the strain responses caused by the two factors are very close, which enucleates that the train response is related to shock energy and has a higher sensitivity to time accumulation; both the peak acceleration and peak strain due to the shock wave remain steady and the two kinds of response by bubble pulse decrease with the centrifugal force increasing; when the target position is more close to the area that the shock wave vertically impact ,the linear correlation between peak velocity and shock factor is much better.

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“…Noise and vibrations caused by the explosion can be con ned to the body of the water to minimize their impact on the surroundings. Shock waves and bubble pulses generated by explosions in water have been investigated for their utilization in the disintegration of structures or materials [9][10][11] . Underwater explosion has been applied mainly in marine and military engineering.…”

Section: Introductionmentioning

confidence: 99%

Applying Underwater Explosion for the Liberation of Neodymium Magnet Rotor Followed by Thermal Treatment for Recycling

et al. 2016

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Prior to applying metallurgical processes for the recovery of rare earth elements from neodymium magnets in used rotors, it is necessary to separate the neodymium magnets from the rotors as effectively as possible. Due to the characteristics of the rotors such as hard steel cover, complex inner structure, and strong magnetic elds of neodymium magnet, it is dif cult to disintegrate the neodymium magnet rotors by traditional mechanical crushing methods.This research letter presents the result of a preliminary experiment on applying underwater explosion for the liberation of neodymium magnet rotor followed by thermal treatment for recycling. The neodymium magnet rotor used in the compressor unit of an air conditioner can be effectively disintegrated by underwater explosion. The crushed products contain several steel pieces with neodymium magnet powder attached to their surfaces. After the crushed products are heated above the Curie temperature of the neodymium magnet, the neodymium magnet powder is demagnetized. After it is sieved, the neodymium magnet powder can be separated from the steel pieces. The separated powder can be subsequently treated by developed metallurgical processes for rare earth elements recovery.

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Reloading effects on plane plates subjected to non-contact underwater explosion

Cited by 22 publications

References 15 publications

Numerical simulation of underwater explosion bulge test

Numerical simulation of underwater explosion bulge test

Centrifuge experiment and numerical study on the dynamic response of air-backed plate to underwater explosion

Applying Underwater Explosion for the Liberation of Neodymium Magnet Rotor Followed by Thermal Treatment for Recycling

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