The response of mild steel and armour steel plates to localised air-blast loading-comparison of numerical modelling techniques

Mehreganian, Navid; Louca, L.A.; Langdon, G.S.; Curry, R.J.; Abdul-Karim, Nadia

doi:10.1016/j.ijimpeng.2018.01.010

Cited by 54 publications

(36 citation statements)

References 39 publications

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“…Under the circumstances where the blast pressure is induced by a proximal charge and the ratio of the charge diameter to the expensed length of the target is small, such as those in [60] ( Fig. 26), the majority of the load is dissipated before reaching the target boundaries, thus, it is reasonable to consider the effective length of the panels in use of pattern (A).…”

Section: Discussion Of the Results And Of Experimental Validationsmentioning

confidence: 99%

“…In the second category, the results of each pattern of motion were compared against the available experimental data on the effect of stand-off on blast phenomenon by Jacob et al [57], using mild steel plates, as well as those of Langdon et al [58], [59] on blast protection armour steel plates. In addition, the numerical results of [60] are investigated for a comparative study.…”

Section: Validations Of the Theoretical Modelsmentioning

confidence: 99%

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Inelastic dynamic response of square membranes subjected to localised blast loading

Mehreganian

Fallah

Louca

2018

International Journal of Mechanical Sciences

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Extensive shock and highly localised blast waves generated by detonation of near field explosives (such as Improvised Explosive Devices (IED's)) are catastrophic to structures and detrimental to humans and may result in injury or death, penetration and progressive damage, or perforation through the structure and collapse. Mitigating the effects of such waves is paramount in various aspects of design in Structural, Aeronautical, and Defense engineering, as well as being useful in Forensic Sciences. A theoretical model is presented here to predict the large inelastic deformation of ductile thin square membranes induced by a generic short duration localised pressure pulse load. The pulse loading was idealised as a multiplicative decomposition of spatial and temporal functions. The spatial part is a piecewise continuous function of axisymmetric distribution of constant pressure over a central zone of the target, then exponentially decaying beyond this zone. The temporal part may assume various shapes. Using the constitutive framework of limit analysis and incorporating the influence of finite displacements, two patterns of kinematically admissible, time dependent velocity profiles were investigated. These patterns included stationery and moving plastic hinges. The results were investigated in two cases: once with the interaction between bending moment and membrane forces retained in the analyses, and then when the response was solely governed by membrane forces. For blast loads of high magnitude, the pressure was replaced by an impulsive velocity and the results were cast as functions of dimensionless form of initial kinetic energy. The theoretical results corroborated well with the available experimental results on high strength ARMOX steel, a class of steel impervious to the phenomenon of rate sensitivity.

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Section: Discussion Of the Results And Of Experimental Validationsmentioning

confidence: 99%

Section: Validations Of the Theoretical Modelsmentioning

confidence: 99%

Inelastic dynamic response of square membranes subjected to localised blast loading

Mehreganian

Fallah

Louca

2018

International Journal of Mechanical Sciences

Self Cite

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“…The Johnson-Cook parameters for ARMOX 440T steel are obtained from Ref. [33] and presented in Table 1. …”

Section: Steel Materials Characterisationmentioning

confidence: 99%

“…'s [33], and [35] in Blast Impact and Survivability Research Unit at the University of Cape Town the details of which could be found in the literature, however; a brief description of the tests is given here. Air blast load was generated by the blast chamber facility through detonating disk explosives of PE4 using MA2A3 electrical detonator, which was in turn mounted on a polystyrene bridge to provide the desired stand-off by varying the lengths of bridge legs (Fig.…”

Section: Description Of Experimental Setupmentioning

confidence: 99%

Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis

Fallah

Mehreganian

Boiger

et al. 2017

IJM

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“…More studies were focused on the failure of the shield plates and effect of stand-off distance, as done by Nurick et al [4][5], Bonorchis et al [6][7], Chung et al [8][9], Jacob et al [10], respectively. As found that in these studies, the whole process can be categorized into three distinct phases, including, a) Phase "i" , the expansion of explosion, from time of detonation to its interaction with the structure; b) Phase "ii" , explosive plate interaction; and c) Phase "iii", expansion of the explosion from time of separation from plate to expansion of the plate equilibrium [11]. In addition, to further explain the dynamic mechanical behavriours, further effectively predict response modes, some theoretical analyses were also developed [13], analytical solution were obtained in good agreement with numerical and experimental observation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Mechanism of Thin-Walled Metallic Defensive Structure from Explosion in Transportation

Yao¹,

Zhao²,

Zhang³

et al. 2020

Preprint

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Defensive structure is important in transportation field for kinds of intentional or unintentional explosion. Structures subjected to unconfined and confined explosion will bear different blast loads and their dynamic responses are different. The present work focus on the dynamic response mechanism of steel plate under unconfined and confined blast loads through both numerical and experimental studies. In the experiment, Digital Image Correlation (DIC) technique was applied to record and analyze the dynamic response process of large-scale field blast test. The DIC measured curve and the numerical calculated curves agrees well in both the trends and the peak values. Then, the dynamic response mechanism of steel plate under unconfined blast (UB) load and confined blast (CB) load were compared and discussed. Results show that the dynamic response of plate can be divided into three phases under both UB and CB loads, while with different mechanism. In phase I, plastic hinge starts from the center and moves to the boundary in UB condition, while in case of CB, plastic hinge occurs close to the boundary and moves in the opposite direction. In phase II, two plastic hinge lines propagates towards each other, and a platform exists between the boundary and the central area remains undeformed in UB condition, while in CB condition, larger deformation in peripheral region rather than central area produces.

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The response of mild steel and armour steel plates to localised air-blast loading-comparison of numerical modelling techniques

Cited by 54 publications

References 39 publications

Inelastic dynamic response of square membranes subjected to localised blast loading

Inelastic dynamic response of square membranes subjected to localised blast loading

Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis

Dynamic Response Mechanism of Thin-Walled Metallic Defensive Structure from Explosion in Transportation

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