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Showing 2 results for Free Explosion
Seyed Mahmood Farmani, Majid Alitavoli, Hashem Babaei, Mojtaba Haghgoo,
Volume 23, Issue 12 (12-2023)
Abstract
In this research, the deformation of circular metal sandwich panels with vertical tube cores under blast load has been investigated numerically and experimentally. The relationship of energy balance in different components of the structure has been considered. The core tubes are installed in a cross arrangement and vertically with the same height between the upper and lower sheets of the sandwich structure. The amount of energy absorbed by the cores is determined according to their location in the structure and the effect of their number and diameter. The grouping of the desired tests for this research has been done according to the thickness of the sheet 1.2 and 2 mm and with aluminum cores with diameters of 12 and 16 (mm). Numerical simulation has been done in the form of free explosion and by defining the pressure function using the Conwep method in Abaqus software. To validate the numerical results, experimental tests have been carried out with the construction of sandwich structure. In both methods, the maximum lateral displacement of the structure at its center and the displacement in terms of distance from the center of the structure, at cores location have been measured. Increased number of tubes in the core of the structure decreased the maximum rise in the upper layer and decreased the transverse displacement of the lower sheet. Structures with fewer cores and less sheet thickness showed more energy absorption. The average difference between the results of numerical and experimental methods was approximately 11%.
Seyed Mahmood Farmani, Mojtaba Zia Shamami, Majid Alitavoli,
Volume 24, Issue 8 (7-2024)
Abstract
In this research, the amount of transverse displacement of circular sandwich panels under explosive loading was investigated using the experimental method, and then, by using the Bessel shape function and subtracting the plastic work of the core components and other deformations from the total kinetic energy given to the structure, the relation for the prediction of the transverse displacement of the plates is provided.The experimental tests are grouped by the construction of the sandwich structure, which is 1.2 and 2mm thick steel plating with aluminum tube cores with external diameters of 12 and 16 mm with a cross arrangement and vertically with the same height between the upper and lower plates of the structure. The results obtained from the methods of this research are expressed by presenting the maximum amount of transverse displacement in terms of the distance from the center of the structure and the amount of length change for each of the cores of the structure. It was found that by increasing the volume of the cores in the sandwich structure, the rigidity of the structure does not necessarily increase against a certain applied load. In the investigation of some structures, the effect of the amount of core collapse on the transverse displacement is almost equal to the effect of the thickness of the plate. The average difference of the results is less than 12 %
