Abstract
Mines, specifically as Anti-Tank (AT) mines are a significant threat for defence vehicles. While approaches such as v-shaped hulls are currently used to deflect the blast products from such threats, such a solution is not always usable when hull standoff is limited. As such the development of a low profile, energy absorbing solution is desirable. One approach that has potential to achieve these requirements are sandwich panels. While sandwich panel cores can be constructed from various materials, one material of particular interest are auxetics. Auxetic are materials that exhibit a negative Poisson’s ratio. This material has potential to be an efficient an impact energy absorber by increasing stiffness at local deformation by gathering mass at the impact location. This study investigates the effectiveness of novel auxetic core infills alongside three other panel types (monolithic, air gap, polymer foam sandwich) against buried charges. 160 grams of PE4 were buried in 100 mm depth and 500 mm stand off the target. Laser and High Speed Video (HSV) system were used to capture the deflection-time profile and load cell sensors were used to record the loading profile received by the panels. Experimental works were compared with numerical model. Explicit model were generated in LSDYNA software as ‘initial impulse mine’ keyword. The result found that the auxetic and foam core panels were effective in reducing peak structural loading and impulse by up to 33% and 34% respectively. Air-filled panels were the most effective to reduce the deflection of the rear of the plate, however variation between capture methods (HSV and Laser system) were reported, while numerical modelling provided comparable plate deflections responses. When normalised against panel weight, the air filled panels were experimentally the most efficient per unit mass system with the auxetics being the least effective.
Highlights
Anti-vehicle (AV) mines and Improvised Explosive Devices (IEDs) have become a feature of modern warfare
Buried charge modelling We considered that ‘Initial impulse mine’ were suitable in this case due to the accuracy and considered less time consuming than other methods 56
When compared against the models (Figure 13 and Table 4), the difference between maximum model deflections and the mean panel deflections recorded by laser system and the High Speed Video (HSV) were -56% to 16% and -52% to 38% respectively, with the biggest deviation exhibited by the foam filled panels
Summary
Anti-vehicle (AV) mines and Improvised Explosive Devices (IEDs) have become a feature of modern warfare. For auxetic materials, Qi et al 39 compared the numerical and experimental results of sandwich panels under 250 grams of composition B explosive They examined the areal specific energy absorption (ASEA), and the study indicated the potential of auxetic in the protection of civil and vehicle objects. The objectives of this study are: (i) to conduct the explosion testing of 160 grams of PE-4 explosives, which is relatively larger amount of size than the existed works, buried under the fine building sand (ii) to replicate the observed testing in numerical modelling; (iii) to compare the results between the experimental and numerical simulation; and (iv) to investigate the displacement and impulse response on four different panel configurations, i.e. monolithic, air gap, Styrofoam core and steel-made auxetic sandwich. The specific energy absorption will be presented to figure out the effectiveness of auxetic structures in absorbing impulse damage
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