Calculation and experiments on the deformation of explosion-chamber shells

Аbakumov, A. I.; Egunov, V. V.; Ivanov, A. G.; Uchaev, A. A.; Tsypkin, V. I.; Shitov, A. T.

doi:10.1007/bf00910411

Cited by 12 publications

(7 citation statements)

References 2 publications

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“…When the chamber or the blast loading does not satisfy a perfect spherical symmetry, other membrane and composite modes will contribute to the chamber response. Previous studies on strain growth of the spherical chamber response showed that structural perturbation such as nozzles or flanges could introduce localized deformations (Abakumov et al, 1984;Karpp et al, 1983), which is confirmed from the 3D model of PC chambers. Previous numerical model related to uniform initial impulses shows strain growth due to linear and nonlinear modal coupling response, indicating small imperfections (associated with imperfect spherical geometry) can induce the contribution of composite modes after multiple cycles of vibration (Dong et al, 2010).…”

Section: Spherical Chambers Subjected To Eccentric Tnt Detonationssupporting

confidence: 65%

On the effectiveness of ventilation to mitigate the damage of spherical membrane vessels subjected to internal detonations

Hernández

Zhang

Hao

2020

International Journal of Protective Structures

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This article conducts a comparative study on the effectiveness of ventilation to mitigate blasting effects on spherical chambers subjected to internal detonations of high explosives through finite element analysis using the software package AUTODYN. Numerical simulations show that ventilation is ineffective in mitigating the damage of spherical chambers subjected to internal high explosives explosions because the chamber response is mainly described by high-frequency membrane modes. Openings do not reduce the chamber response despite they can reduce the blast overpressure after the chamber reaches its peak response. Worse still, openings lead to stress concentration, which weakens the structure. Therefore, small openings may reduce the capacity of the chamber to resist internal explosions. In addition, because large shock waves impose the chamber to respond to a reverberation frequency associated with the re-reflected shock wave pulses, secondary re-reflected shock waves can govern the chamber response, and plastic/elastic resonance can occur to the chamber. Simulations show that the time lag between the first and the second shock wave ranges from 3 to 7 times the arrival time of the first shock wave, implying that the current simplified design approach should be revised. The response of chambers subjected to eccentric detonations is also studied. Results show that due to asymmetric explosions, other membrane modes may govern the chamber response and causes localized damage, implying that ventilation is also ineffective to mitigate the damage of spherical chambers subjected to eccentric detonations.

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Section: Spherical Chambers Subjected To Eccentric Tnt Detonationssupporting

confidence: 65%

On the effectiveness of ventilation to mitigate the damage of spherical membrane vessels subjected to internal detonations

Hernández

Zhang

Hao

2020

International Journal of Protective Structures

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“…In fact, the pressure time-history, which acts on chamber walls subjected to fully or partially confined HE detonations, is commonly described by three components. In this context, the three pressure components that are generated by confined HE detonations that occur on spherical chambers have been described from theoretical derivations (Abakumov et al, 1984; Belov et al, 1986; Zhdan, 1981), numerical simulations (Donahue et al, 2013; Dong et al, 2012; Hernandez et al, 2016; Li et al, 2008), and observed from experimental data (Adishchev and Kornev, 1979; Anderson et al, 1983; Belov et al, 1986; Beshara, 1994; Buzukov, 1980; Chan and Klein, 1994; Donahue et al, 2013; Dong et al, 2012; Hernandez et al, 2016; Karpp et al, 1983; Li et al, 2008). The first component is an impulsive component caused by the reflection of the first shock wave, which propagates supersonically from the detonation point until it reaches the chamber wall.…”

Section: Introductionmentioning

confidence: 99%

On the effectiveness of ventilation to mitigate the damage of spherical chambers subjected to confined trinitrotoluene detonations

Hernández

Hao

Zhang

2018

Advances in Structural Engineering

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This article presents a comparative study on the effectiveness of ventilation to mitigate blasting effects on chambers subjected to confined detonations of high explosives. The pressure time-history that acts on the chamber walls is described by three components: (1) the first shock wave, (2) the train of re-reflected shock waves, and (3) the gas pressure. The radial response of spherical chambers is described by the radial breathing mode and modeled by an equivalent single degree of freedom system. The three pressure components are considered for the calculation of the maximum ductility ratio, which is obtained from the numerical solution of the single degree of freedom chamber response. It is assumed that openings reduce the gas pressure but they have an insignificant effect on shock waves. The dynamic response of fully and partially confined chambers are calculated and compared. Results show that intermediate/small openings (less than 10% of the surface of the chamber) are ineffective to mitigate the chamber response and damage. The vibratory response of the chamber is susceptible to elastic or plastic resonance but it is not considerably modified by the long-term gas pressure because of its high radial breathing mode frequency, allowing concluding that ventilation is ineffective to reduce the maximum response of spherical chambers subjected to internal high explosive explosion.

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“…However, the use of TECs is limited in that the TEC body and its elements are loaded in a pulse mode [1,2] for which there are no well-developed methods of analytical estimates. Both the model calculation and experimental data (see, e.g., [3]) and the experimental data obtained for real TECs [4][5][6] show that the stress state of the TEC body is influenced by the presence of added masses, nonideal shape, the presence of internal mobile elements (worktables), etc. In these conditions, one of the methods of solving the main problems is the simultaneous performance of numerical and experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Effect of stiffness of shock-absorbing pads on the stresses in explosion chambers

Meshcheryakov

Pikarevskii

Stoyanovskii

2013

J Appl Mech Tech Phy

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Calculation and experiments on the deformation of explosion-chamber shells

Cited by 12 publications

References 2 publications

On the effectiveness of ventilation to mitigate the damage of spherical membrane vessels subjected to internal detonations

On the effectiveness of ventilation to mitigate the damage of spherical membrane vessels subjected to internal detonations

On the effectiveness of ventilation to mitigate the damage of spherical chambers subjected to confined trinitrotoluene detonations

Effect of stiffness of shock-absorbing pads on the stresses in explosion chambers

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