On Evaluation and Comparison of Blast Loading Methods Used In Numerical Simulations

Yıl 2018, Cilt: 22 Sayı: 5, 1385 - 1391, 01.10.2018

Atıl Erdik , Vahdet Uçar

https://doi.org/10.16984/saufenbilder.357629

Cited By: 4

Öz

It is crucial to assess the
dynamic behavior of structures exposed to blast loading in order to improve the
integrity and survivability. Numerical simulations are widely used to predict
the response of structures under blast loading. A commercial nonlinear finite
element code, LS-DYNA provides three blast loading methods: Empirical blast
modeling technique CONWEP, Arbitrary Lagrangian Eulerian technique (ALE), and
hybrid CONWEP - ALE technique. In this study, an experimental testing of a flat
plate subjected to blast loading is modeled using these three blast loading
methods in LS-DYNA. Mesh resolution study of ALE formulation is conducted to
determine the influence of element mesh size on predicting blast loading
effects that is converted through fluid structure interaction algorithm from
Eulerian to Lagrangian type of elements. It is drawn a comparison between peak
pressures calculated in simulations and maximum dynamic deformation measured in
the field test. Finally, the discussion and conclusion are provided.

Anahtar Kelimeler

Blast loading, CONWEP, Arbitrary Lagrangian Eulerian (ALE) method, LS-DYNA, Numerical simulation, Mesh sensitivity

Kaynakça

• [1] G. Randers-Pehrson, K.A. Bannister, Airblast Loading Model for DYNA2D and DYNA3D, in: ARL-TR-1310, US Army Research Laboratory, Aberdeen Proving Ground, 1997.
• [2] C.N. Kingery, G. Bulmash, Airblast parameters from TNT spherical air burst and hemispherical surface burst, in, Ballistic Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD, 1984.
• [3] N.F.E.C. U.S. Army Corps of Engineers, Air Force Civil Engineering Support Agency, Design and analysis of hardened structures to conventional weapons effects, in: Supersedes TM 5-855-1/NAVFAC P- 1080/AFJAM32/DSWA DAHSCWEMAN-97 August 1998, Department of the Army, US Army Corps of Engineers and Defense Special Weapons Agency, Washington, DC, 2002.
• [4] J.L.C. C. W. Hirt, T. D. Butler, A Lagrangian method for calculating the dynamics of an incompressible fluid with free surface, Journal of Computational Physics, 5(1) (1970) 103-124.
• [5] C.W. Hirt, An arbitrary Lagrangian-Eulerian computing technique, in: Proceedings of the Second International Conference on Numerical methods in Fluid Dynamics Lecture Notes in Physics, 1971, pp. 350-355.
• [6] T.P. Slavik, A Coupling of Empirical Explosive Blast Loads to ALE Air Domains in LS-DYNA, in: 7th European LS-DYNA Conference, Livermore Software Technology Corporation, Salzburg, Austria, 2009.
• [7] Z.S. Tabatabaei, J.S. Volz, J. Baird, B.P. Gliha, D.I. Keener, Experimental and numerical analyses of long carbon fiber reinforced concrete panels exposed to blast loading, International Journal of Impact Engineering, 57 (2013) 70-80.
• [8] J.O. Hallquist, LS-DYNA keyword user’s manual, in, Livermore Software Technology Corporation, California, U.S.A., 2007.
• [9] B.M. Dobratz, P.C. Crawford, LLNL Explosive Handbook "Properties of Chemical Explosives and Explosive Simulants", in, Lawrance Livermore National Laboratory, Livermore, California, 94550, 1985.
• [10] J.O. Hallquist, LS-DYNA theory manual, in, Livermore Software Technology Corporation, 2006.