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.
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.
This paper reports results from an experimental and computational study on the influence of bend radius and internal angle on the damage and impulse transfer characteristics of flexible steel V-structures subjected to localized explosion loading. This issue has bearing on the manufacturing of V-hulls used for Mine Resistant Ambush Protected vehicles used around the world. Global impulse transfer, damage and transient deformation were measured during small-scale explosive detonations on 1:8-scale V-structures. The work found that increasing the bend radius to values that can be used in practical manufacturing generated damage that was less localized than the damage observed in V-structures with tighter bend radii. High-speed imaging was able to measure transient deformation that was maximal in the centre, and lower elastic post-peak vibration magnitudes at high charge masses. The impulse transfer increased as the bend radius increased and the internal V-angle increased. Since V-structures with tighter bend radii exhibit less permanent deformation and higher deformation gradients, they will be more prone to localized ruptures when deployed for blast protection, whereas structures with larger tip radii will need a larger region of the V-structure repaired after a blast event but may be less prone to rupturing when the blast loading is localized.
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