Numerical simulation of the natural fragmentation of explosively loaded thick walled cylinders

Cullis, I.G.; Dunsmore, P.; Harrison, Alan; Lewtas, I.; Townsley, R.

doi:10.1016/j.dt.2014.06.003

Cited by 35 publications

(22 citation statements)

References 3 publications

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“…(1)), as well as in the above-mentioned models, the velocity distribution is uniform along the longitudinal axis of the cylinder. However, it is more likely that the velocity distribution along the cylinder longitudinal axis is not constant [10,11]. Only few sources recommend evaluation of a non-uniform velocity distribution, by applying reduction factors near the edges of the cylinder.…”

Section: Available Formulas For Fragments Initial Velocitymentioning

confidence: 98%

Numerical study of velocity distribution of fragments caused by explosion of a cylindrical cased charge

Grisaro

Dancygier

2015

International Journal of Impact Engineering

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Section: Available Formulas For Fragments Initial Velocitymentioning

confidence: 98%

Numerical study of velocity distribution of fragments caused by explosion of a cylindrical cased charge

Grisaro

Dancygier

2015

International Journal of Impact Engineering

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“…However, providing the simulations obey the laws of physics, for the casing and the explosive, they can provide a possible indication. 33 provides a high-speed photograph that indicates major cracks along the full length of the thick walled cylinder can be observed.…”

Section: The Shape Of the Expanding Casingmentioning

confidence: 99%

Real-time calculation of the initial angle of projection for fragments in cylindrical warheads

Felix

Colwill

Harris

2021

Journal of Defense Modeling & Simulation

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This paper presents an improvement in the speed and accuracy of calculating the initial angle of projection of fragments for exploding cylindrical shells. It is a fast tool that can be used by designers, where existing approaches, such as computationally intensive Finite Element Analysis, are preventively slow. An enhanced Taylor equation is presented using available experimental data and the effect of the changing shape of the warhead’s cylindrical casing on the fragment’s initial projection angle. The resulting equation is computationally fast as it uses uncomplicated equations and provides improved accuracy for estimating a fragment’s initial angle of projection in comparison to existing work.

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“…FE codes and numerical simulations are cost-effective tools in the field of blast protective design [40,41]. Therefore, the problem under investigation was numerically modelled using Abaqus/CAE and analysed using Abaqus/Explicit solver.…”

Section: Numerical Modellingmentioning

confidence: 99%

Improving the Blast Resistance of Large Steel Gates—Numerical Study

Al-Rifaie

Sumelka

2020

Materials

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Blast resistant gates/doors are essential for sensitive infrastructure, such as embassies, ministries, or parliaments. Lightweight gates equipped with ‘energy absorbing systems’ have better operational performance than the traditional costly and bulky design. Graded auxetic structures have not yet been used as potential passive damping systems in the supporting frame of blast resistant gates. Consequently, this study tries to test if a uniaxial graded auxetic damper (UGAD) proposed by the authors in a recent article, namely the development of a new shock absorbing UGAD, could maintain a 3000 mm × 4500 mm steel gate operable after high blast peak reflected overpressure of 6.6 MPa, from 100 kg TNT at 5 m stand-off distance. The blast-induced response of the gate was assessed, with and without the proposed UGAD, using Abaqus/Explicit solver. Results showed that the attachment of the proposed UGAD to the gate led to a dramatic decrease in permanent deformations (a critical factor for gate operability after a blast event). Hence, a lighter, more economical gate (with 50% reduction in mass) was required to satisfy the operability condition. In addition, 49% of peak reaction forces were diminished, that have a direct impact on the supporting frame. Moreover, the results revealed that, in the numerical model, 56% of the achieved plastic dissipation energy was from the UGADs, and 44% from the gate. The outcomes of this research may have a positive impact on other sectors beyond academia, such as industry, economy, and public safety.

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Numerical simulation of the natural fragmentation of explosively loaded thick walled cylinders

Cited by 35 publications

References 3 publications

Numerical study of velocity distribution of fragments caused by explosion of a cylindrical cased charge

Numerical study of velocity distribution of fragments caused by explosion of a cylindrical cased charge

Real-time calculation of the initial angle of projection for fragments in cylindrical warheads

Improving the Blast Resistance of Large Steel Gates—Numerical Study

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