جستجوی مقالات مرتبط با کلیدواژه « explosion » در نشریات گروه « مکانیک »

One of the casualties in war zones is casualties due to the explosion of explosives near vehicles. The important issue in these vehicles isn’t to seriously injure the occupant during the explosion. It is necessary to optimize of the cabin structure of heavy vehicles to achieve high-performance vehicles. In this article, the 3-d model of the truck is created to study the effect of exploding near and under a truck and to optimize the truck cabin. The model is meshed by square and 10 mm^2 elements. Then, explosion tests are simulated in two situation: explosion under the vehicle and explosion near the truck according to AEP-55. In the explosion test under the car,using 4 kg TNT equivalent on the ground surface and In the test near the truck, using 8 kg TNT equivalent at the distance of 3 meter at the same level by under cabin surface and the amount of occupant injuries are checked. For meeting the requirements of the explosion and because this truck platform is a commercial vehicle, vehicle floor panels’ material and thickness are modified. The thickness of important parts include 1. Side floor panel 2. Middle floor panel 3. Front side panel 4. Front Panel 5 Door Panel are optimized in 16 modes and Only 7 modes meet the requirements of the explosion test under the vehicle. The optimal mode is 571.39 kg which has decreased 79.72 kg compared to the first mode meet AEP-55 requirements and has decreased 3.31kg compared to the initial mode.

Sandwich structures with cores made of porous materials such as various types of metal and polymer foams are effective in absorbing the energy of explosive loads and due to their lightness can be used well in various industries. In this paper, deformation and energy absorption of sandwich panels with aluminum and steel face sheet and cores made of polyurethane foam, which is filled with two types of mineral pumice of different sizes (so-called chickpea size and almond size), under experimental free explosion loading. And numerical simulation has been studied with the help of Abaqus finite element software. In this study, the mechanical behavior of the core was first studied by making samples of polyurethane foam and mineral pumice under compression testing and the results were used in software behavioral models. After comparing the numerical results with the results of experimental test, and validating the results of numerical methods, numerical parametric studies were performed and the effect of pumice type, core thickness, face sheet material and thickness on the rate of deformation and energy absorption of sandwich panel components have been studied. The results show that the panel with a thicker back face sheet has a better performance in absorbing explosion energy. Also, as the strength or thickness of the face sheets increases, the role of the core in energy absorption decreases.