Design and energy absorption enhancement of vehicle hull under high dynamic loads

Saeimi-Sadigh, Mohammad-Ali; Paykani, Amin; Afkar, Amir; Aminollah, Dehghan

doi:10.1007/s11771-014-2067-4

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Predicting the mechanical response of a structure to a blast is not an easy task. Numerical studies have been performed on mechanical components, such as panels or plates: for instance, in (Saeimi-Sadigh et al, 2014), finite element simulations show the response of V-shaped plates to anti-tank mines; the work in (Louca et al, 1998) deals with stiffened plates; in (Jacinto et al, 2001), the authors compare numerical and experimental results describing the response of rectangular metallic plates; other examples of similar numerical implementations can be found in (Han and Liu, 2015; Ritchie et al, 2018; Li et al, 2020) or in (Whisler and Kim, 2014) for the development of a non-explosive test method.…”

Section: Introductionmentioning

confidence: 99%

Shock qualification of low-cost blast resistant wheels by in field tests

Silvestri

Adele

Elisa

et al. 2022

International Journal of Protective Structures

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This paper presents the results obtained during an experimental campaign on blast resistant wheels designed for a low-cost demining machine, derived from an agricultural tractor. Such wheels must fulfil two requirements: first, they have to be able to retain their mechanical integrity in case of blast and still work after one or more explosions, in order to be able to drive the machine out of the minefield without human intervention; second, they must reduce as much as possible the amount of energy transferred to the vehicle, to protect the on-board equipment from the effect of the detonation of a landmine. One of the goals of the experimental activity was to compare two wheels characterized by different designs. Mechanical performance and capacity of the wheels to reduce the energy transferred to the vehicle have been assessed to verify whether the wheels were suitable for the task and to identify which wheel performs best. Physical integrity of both wheels was assessed by visual inspection after each explosion. To evaluate the energy transferred to the vehicle, a measurement of the potential energy transferred, by means of a ballistic pendulum, equipped with an encoder, was performed together with a triaxial acceleration measurement in correspondence of the wheel hub. The triaxial accelerometer measurement was then also used to assess the behaviour of the wheels mounted on the vehicle after tests on the ballistic pendulum. Wheel performances have been quantified using specific features and frequency domain functions, related to the damage induced by the vibration at the interface between the hub and the demining machine. The obtained results suggest that the heaviest wheel performs better both in terms of mechanical integrity and of shock response.

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Section: Introductionmentioning

confidence: 99%

Shock qualification of low-cost blast resistant wheels by in field tests

Silvestri

Adele

Elisa

et al. 2022

International Journal of Protective Structures

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“…The light-weight armour design and analysis is possible by conducting physical experiments or through numerical simulations 3,4 . So far, the hull obliquity was extensively tested for crew protective capabilities [5][6][7][8] , without considering much about ergonomics (occupant workspace) and weight factors (vehicle weight). Along with protective capability, the effect of hull obliquity on vehicular weight and occupant space is equally important 9,31 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Hull Obliquity on Crew Protection, Mass and Space Occupancy of Light Armoured Vehicle

2021

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Apart from strengthening crew protective capability from gunfire, the hull obliquity in a light armoured vehicle (LAV) affects its weight and comfortable occupancy. Thus, it requires a critical design analysis for the obliqued hull. The study aims to present the optimal design analysis of an obliqued hull structure to ensure comfortable occupancy of the crew along with its minimum attainable weight and higher protection capability from the gunfire. Three geometric models (G1, G2, and G3) were investigated for the LAV hull’s optimal design. The analytical approach was used to investigate the hull obliquity’s effect, and the results were validated using experimental data reported by other researchers. Digital human modelling was adopted for validating the space adequacy of the hull. It was observed that the hull’s crew protection capabilities from the horizontal strike of armour piercing rounds/bullets were improved almost by half and double for G2 and G3, respectively, when compared with G1. The analytical results are also in good agreement with globally accepted experimental data at reasonable variations. The highest protection capability and comfortable occupancy for the targeted users can be achieved by G3 without affecting the mobility of LAV.

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“…Raising the height of a vehicle above the surface is beneficial since the sand density is reduced by axial and lateral expansion and by additional time for air drag to decelerate the soil particles [12]. The use of a V-shaped hull that reduces the fraction of momentum that is transferred to the impacted surface and increases the time over which the momentum transfer occurs has also been investigated in numerous studies [4,5,[14][15][16][17]. When both approaches are implemented in conjunction with the use of damage resistant materials and structures, the susceptibility of light vehicles to damage by shallow buried landmines can be significantly reduced [18].…”

Section: Introductionmentioning

confidence: 99%

Momentum transfer during the impact of granular matter with inclined sliding surfaces

Kyner

Deshpande

Wadley

2017

Journal of the Mechanics and Physics of Solids

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Increasing the inclination of a rigid surface that is impacted by a collimated granular flow reduces the fraction of granular matter momentum transferred. Recent studies have shown that the momentum reduction depends upon the frictional interaction between the granular flow and the impacted surface with high coefficient of friction surfaces suffering significantly more momentum transfer than predicted by resolution of the incident momentum onto the inclined plane. This discovery has raised the possibility that inclined surfaces with very low friction coefficients might reduce the impulsive transferred by the impact of ejecta from buried explosions. Here the use of a lubricated sliding plate is investigated as a means for reducing interfacial friction and impulse transfer. The study uses a combination of experimental testing and particle-based simulations to investigate impulse transfer to rigid aluminum surfaces inclined either perpendicular or at 53 o degrees to synthetic sand that had been impulsively accelerated to a velocity of 350-550 m/s. The study shows that impact of this sand with lubricated plates attached to an inclined surface, rapidly accelerates them to a velocity of about 55-70 m/s, and reduces the impulse transferred to the inclined surface. The reduction of impulse by this approach is shown to be comparable to that achieved by changing the inclination of the impact.

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Design and energy absorption enhancement of vehicle hull under high dynamic loads

Cited by 6 publications

References 7 publications

Shock qualification of low-cost blast resistant wheels by in field tests

Shock qualification of low-cost blast resistant wheels by in field tests

Effect of Hull Obliquity on Crew Protection, Mass and Space Occupancy of Light Armoured Vehicle

Momentum transfer during the impact of granular matter with inclined sliding surfaces

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