Challenges in blast protection research

Mostert, Frederik J.

doi:10.1016/j.dt.2018.05.007

Cited by 23 publications

(7 citation statements)

References 19 publications

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“…Whenever an explosive is detonated, a sudden shock front leads the propagating gas because of the pressure difference between the pressurized gas and the medium [32]. Once the shock front reaches the structure at point 'S' at a time of arrival 't a ,' a pressure impulse 'P o + ' is created.…”

Section: Performance Indicatorsmentioning

confidence: 99%

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Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

2020

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Extensive research focus had been given to sacrificial sandwich panels to mitigate the effects of blast loads. This is due to their ability to distribute the load and absorb a significant portion of the blast energy. This paper studies the behavior of sacrificial sandwich mild steel panels of axially oriented octagonal tapered tubular cores subjected to near-field impulsive blast. The deformation behavior and several assessment parameters consisting of the peak force, stroke efficiency, energy absorption and core efficiency were investigated using validated finite element analysis. The developed deformation modes were mainly influenced by the top plate and tube thickness. Tubes of a 5° taper performed unfavorably, exhibiting increased peak force and lower energy absorption. Panels of top plate thickness of 4 mm exhibited higher stroke efficiency as compared to panels of lower thickness. The top plate and tube thickness significantly affected energy absorption. An increase of 73.5% in core efficiency was observed in thick-plate panels as compared to thin-plate ones.

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Section: Performance Indicatorsmentioning

confidence: 99%

“…where R' is the distance from the impulse and W is the explosive weight [32]. In a uniform loading, the pressure is distributed evenly across the structure's face.…”

Section: Finite Element Modelmentioning

confidence: 99%

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

2020

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“…To achieve this goal, they can be constructed in different forms, such as thin-wall crushable tubes, wires, rods, aluminium honeycomb, sandwich structures, polymeric foams [10]. There are mainly two challenges pertaining to the design of EA structures [11]:…”

Section: Blast Mitigating Seatsmentioning

confidence: 99%

Developing a Custom Anthropometric Test Device for Experimental Evaluation of Blast Mitigation Seats

Kamel¹,

Harraz²,

Yacoub³

2021

IJAME

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The use of improvised explosive devices against moving vehicles has been on the rise recently. Their explosions induce devastating effects on vehicle occupants. Blast mitigation seats are used as a counter measure to reduce such harmful effects. This paper presents the scientific work for evaluating the efficacy of blast mitigation seats. The work involves designing and building a custom anthropometric test device (ATD) and a drop tower test facility that is used to simulate the drop of a vehicle from heights up to 10 m. The ATD was equipped with two accelerometers; at the neck and at the pelvis. For validation, a multibody dynamics model was developed to simulate the drop test and the results were compared with ones from experiments. An overall root mean square error of 1.28 g was achieved. The test facility was then used to measure the performance of a blast mitigation seat. The results showed that blast mitigation seats reduced peak accelerations on the pelvis and neck areas by 92% and 87% respectively and this translates into moving predicted injuries from fatal to moderate.

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“…In this study, the focus is on the composite slab, which is one of the components in a steel-concrete composite structural system. In blast protection design, there is no better protection than preventing the incidents from happening [4]. This ideal solution, however, is not part of this study, which the ultimate threat comes from explosive blasts is the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

Blast loaded steel-concrete composite slab

Alias¹,

Amin²

2021

JMES

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This paper presented a numerical investigation of a steel-concrete composite slab subjected to blast loads. The finite element model of the composite slab was developed and validated against experimental results. The validated finite element model of the composite slab then subjected to blast loads using CONWEP function in ABAQUS. A validation investigation was performed on CONWEP function by comparing the blast-pressure profiles from CONWEP against experimental data. Both validation studies showed that the developed finite element model of the composite slab and CONWEP agree reasonably well with test results. The fully restrained composite slab was subjected to four different blast loads with different explosive weights and standoff distances. The transient deformation of the composite slab after subjected to blast loads was investigated where as predicted the deformation of the composite slab was influenced by the blast pressure, which is affected by the weight of explosive and standoff distance. This study also investigated the mode of failure where it was determined flexural failure at the midspan is the main mode of failure accompanied with concrete tensile failure at the supports. The thickness of the profiled deck and the coeffecient of friction influenced the dynamic response of the composite slabs. Increasing the thickness reduces the maximum displacement of the composite slabs. Increasing the coefficient of friction reduces the maximum dislacement but once the coefficient of friction reach its optimum value, no positive benefit is gained.

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Challenges in blast protection research

Cited by 23 publications

References 19 publications

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

Developing a Custom Anthropometric Test Device for Experimental Evaluation of Blast Mitigation Seats

Blast loaded steel-concrete composite slab

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