Blast response of Light Armoured Vehicles (LAVs) with flat and V-hull floor

Trajkovski, Jovan; Perenda, Jasenko; Kunc, Robert

doi:10.1016/j.tws.2018.06.040

Cited by 25 publications

(17 citation statements)

References 28 publications

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“…Following their previous work, Trajkovski et al (2018) modelled a typical full-scale MRAP vehicle using LS-DYNA. The design appeared to have a small flat section in the V-tip area.…”

Section: Introductionmentioning

confidence: 99%

The effect of the bend radius on the impulse transfer characteristics of V-hulls: Numerical simulations

Langdon

Shekhar

2019

International Journal of Protective Structures

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A study was performed to investigate the effects of geometry on impulse transfer to V-plates subjected to localised air-blast loading. The V-plates were designed to be 1:8 scale compared to the full-scale V-hulls used in landmine-protected vehicles. Simulations were performed using LS-DYNA and validated using results from blast experiments on scaled rigid V-plated structures of varying internal angle. The validated numerical models were then used to ascertain the influence of including the clamp, varying the stand-off distance, internal angle and V-tip radius on impulse transfer. The simulations showed that, in general, the impulse increased as V-tip radius increased. For the 90° and 120° V-plates, the impulse transferred was observed to plateau for bend radii greater than 160 mm. The increase in impulse was attributed to changes in the spatial and temporal load distribution due to the higher V-tip radius. There was no significant variation in the pressure distributions for larger bend radii (above 160 mm). For both the 90° and 120° V-plates, a dip in impulse was observed when the V-tip radii was between 0 and 20 mm. This was caused by reduced peak pressures and an increase in gas flow. Fixing the clearance height and increasing the V-tip radius (and therefore the stand-off distance) had no discernible effect on impulse transfer. However, it was shown to increase the arrival time and load duration, while decreasing the peak total force.

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“…Following their previous work, Trajkovski et al (2018) modelled a typical full-scale MRAP vehicle using LS-DYNA. The design appeared to have a small flat section in the V-tip area.…”

Section: Introductionmentioning

confidence: 99%

The effect of the bend radius on the impulse transfer characteristics of V-hulls: Numerical simulations

Langdon

Shekhar

2019

International Journal of Protective Structures

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“…This implies that the width of rectangular hull structure (G1) at oblique angle, θ=0° should not exceed the maximum allowable width, w max =2.5, which ought to be defined by transportability and mobility factors 19,22 .…”

Section: Problem Definition Of Optimisationmentioning

confidence: 99%

“…The variation in constraints (w, w b, and h r ) was graphically tested w.r.t oblique angle. The globally accepted value of the maximum allowable width constraint, w max = 2.5 m was decided based on a previous study by Trajkovski 22 , et al, while the values of w b and h r were taken as 1.36 m and 1.65 m in accordance with occupant space dimensions in terms of user anthropometry (Table 1). The graphs were plotted taking two of them fixed, and one as axis of ordinates with oblique angle (θ).…”

Section: Effect Of Oblique Angle On Hull Width and Interior Spacementioning

confidence: 99%

“…This study was not carried out without limitations. Though various studies reported numerical simulations and experimental tests to investigate the protection capabilities in LAVs from hull obliquity aspect 2,22,32 , there was a need to evaluate optimal hull obliquity parameters for effective occupant space/ergonomics. Therefore, this research was conducted to analytically study the obliquity of LAV armour plate and to explore its tangible benefits for comfortable occupancy and minimum weight, and improved protection capabilities.…”

Section: Dhm Evaluation Of the Proposed Modelsmentioning

confidence: 99%

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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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“…A compromise is required when determining the internal angle of the V-structure. Small internal angles mean a higher centre of gravity and reduced space in the crew compartment [5]. Larger angles are less effective at laterally deflecting the blast load [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Attempts to improve on the V‐hull structural design for air‐blast loading applications

et al. 2021

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Mine resistant ambush protected vehicles often use mono‐V structures in the design of their hulls for blast protection purposes. These hulls deflect blast waves laterally in the event of a landmine detonation directly beneath the vehicle. Lower internal angles offer greater deflection capability, reducing the impulse transfer to the vehicles, but at the cost of increased ride height. This paper reports results of attempts to improve on V‐hull structural designs for air‐blast loading applications, where scaled blast tests are performed to evaluate the designs in terms of structural deformation, rupture and impulse transfer characteristics. Structures with double V and W profiles are compared to mono V structures with a 120° internal angle, such that the proposed designs do not increase the ride height. Results showed that the double V‐structures limit the central deformation, but some designs have severe deformation at the interface of the central V plate and the shallow base angle structure. W structures seem to be susceptible to rupture at low charge masses. There is no single answer to improved blast protection of vehicle hulls, as design choices must be driven by the anticipated threat range, the important performance metrics and other operational considerations.

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Blast response of Light Armoured Vehicles (LAVs) with flat and V-hull floor

Cited by 25 publications

References 28 publications

The effect of the bend radius on the impulse transfer characteristics of V-hulls: Numerical simulations

The effect of the bend radius on the impulse transfer characteristics of V-hulls: Numerical simulations

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

Attempts to improve on the V‐hull structural design for air‐blast loading applications

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