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Numerical simulations of blast loads and structural deformation from near-field explosions in air
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
2011 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 38, no 7, p. 597-612Article in journal (Refereed) Published
Abstract [en]

Numerical simulations of air blast loading in the near-field acting on deformable steel plates have been performed and compared to experiments. Two types of air blast setups have been used, cylindrical explosive placed either in free air or in a steel pot. A numerical finite element convergence study of the discretisation sensitivity for the gas dynamics has been performed, with use of mapping results from 2D to 3D in an Eulerian reference frame. The result from the convergence study served as a foundation for development of the simulation models. Considering both air blast setups, the numerical results under predicted the measured plate deformations with 9.4–11.1%. Regarding the impulse transfer, the corresponding under prediction was only 1.0–1.6%. An influence of the friction can be shown, both in experiments and the simulations, although other uncertainties are involved as well. A simplified blast model based on empirical blast loading data representing spherical and hemispherical explosive shapes has been tested as an alternative to the Eulerian model. The result for the simplified blast model deviates largely compared to the experiments and the Eulerian model. The CPU time for the simplified blast model is however considerably shorter, and may still be useful in time consuming concept studies. All together, reasonable numerical results using reasonable model sizes can be achieved from near-field explosions in air.

Place, publisher, year, edition, pages
2011. Vol. 38, no 7, p. 597-612
Keyword [en]
Engineering mechanics - Fluid mechanics
Keyword [sv]
Teknisk mekanik - Strömningsmekanik
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3428DOI: 10.1016/j.ijimpeng.2011.02.005Local ID: 140b8670-6977-4461-8afe-044db59d945bOAI: oai:DiVA.org:ltu-3428DiVA: diva2:976286
Note
Validerad; 2011; 20110324 (bjozak)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Zakrisson, BjörnHäggblad, Hans-ÅkeWikman, Bengt
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