Quick Estimates of Peak Overpressure from Two Simultaneous Blast Waves

Brode, Harold L.

doi:10.21236/ada059940

Cited by 11 publications

(12 citation statements)

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“…This also suggests that for a shock strength exceeding 7 bar, the ideal gas EOS cannot be used. Here, it should be noted that this limit of applicability of the ideal gas EOS is in line with the suggestion of Brode [12] and Guzas & Earls [13]. However, model II can predict the maximum value of reflection coefficient to be approximately 10.…”

Section: (A) Comparison Of Different Modelssupporting

confidence: 88%

High-intensity air-explosion-induced shock loading of structures: consideration of a real gas in modelling a nonlinear compressible medium

Ghoshal

2015

Proc. R. Soc. A.

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ResearchCite this article: Ghoshal R, Mitra N. 2015 High-intensity air-explosion-induced shock loading of structures: consideration of a real gas in modelling a nonlinear compressible medium. The existing practice of designing air-blast-resistant structures relies on the ideal gas model. But this model predicts the maximum value of the reflection coefficient (ratio of the reflected to the incident pressure) to be 8, whereas it can go up to 20 or more as reported in the literature. To address this discrepancy, air medium is modelled as a real gas instead of an ideal gas, where the effect of intermolecular forces, vibration, dissociation, electronic excitation and ionization are included. Ranges of peak overpressure are identified where the ideal gas assumption cannot be used. Differences in impulse transmitted to the free-standing plates of different mass owing to relaxing of the ideal gas assumption and consideration of the real gas model are evaluated. Impulse transmitted to the structures for constant and variable back pressure (VBP) is also compared considering the real gas model. The result shows that for high-intensity shock, the ideal gas model under-predicts impulse transmitted to heavy plates but over-predicts the same for light-weight plates. Impulse transmitted to light-weight plates is also overestimated if VBP is neglected. The implications of this research are substantial for designing highintensity air-blast mitigating structures, which if not considered properly, may lead to compromise in structural performance.

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Section: (A) Comparison Of Different Modelssupporting

confidence: 88%

High-intensity air-explosion-induced shock loading of structures: consideration of a real gas in modelling a nonlinear compressible medium

Ghoshal

2015

Proc. R. Soc. A.

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“…The current work builds upon previous research in numerous aspects. First, it provides a omplete set of parameter equations from the open literature, drawn from Kinney and Graham (1985) and Brode (1977). These open air literature sources are vital for analysts needing to understand the assumptions inherent within the loading model, thus avoiding a "black box" condition.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Other works Hetherington 1994, Kinney andGraham 1985) include alternative equations for air blast parameters, but do not include complete information, especially regarding reflected air blast. Baker et al (1983) includes detailed information about peak values of shock overpressure, as taken from Brode (1977).…”

Section: Blast Parametersmentioning

confidence: 99%

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Air blast load generation for simulating structural response

Guzas¹,

Earls²

2010

Steel & Composite structures

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The current research presents a detailed methodology for generating air blast loading for use within a finite element context. Parameters describing blast overpressure loading on a structure are drawn from open literature sources and incorporated within a blast load generation computer code developed for this research. This open literature approach lends transparency to the details of the blast load modeling, as compared with many commonly used approaches to blast load generation, for which the details are not publicly available. As a demonstration, the load generation code is used with the finite element software LS-DYNA to simulate the response of a steel plate and girder subjected to explosions modeled using these parameters as well as blast parameters from other sources.

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“…These models, defined for the heat capacity ratio corresponding to air (c ¼ 1:4), are as follows: (Kinney, 1962): (Brode, 1977):…”

Section: Analytical Modelsmentioning

confidence: 99%