Investigation and modeling of the effect of shock waves (TNT explosion) on different shapes of honeycomb structures under the effect of water -structure interaction (homogeneous fluid) using the Gears and Hunter model

Underwater explosion is a common threat to warships, submarines and underwater structures. To reduce damage to them, protective structures such as sandwich structures with energy-absorbing cores made of cellular or composite materials, which are either glued to the wet surface of the ship's hull or directly replace the ship's hull, are attracting more and more attention from the maritime industry. In this regard, in this research, the Pearl Port of Kharg, which is a pile-and-deck pier (steel piles and concrete deck), was modeled and monitored in ABAQUS software to evaluate the dynamic behavior under the effect of an underwater explosion using explicit dynamic analysis and the finite element method. In this paper, in order to design and strengthen structures against underwater explosion and study this phenomenon, the analysis of the effect of the charge amount on the change in the shape of honeycomb structures and also the effect of the explosive charge distance has been studied with the help of ABAQUS software and numerical results have been obtained. For verification, a laboratory sample was used in the direction of underwater explosion and acceptable results have been obtained. In this paper, two diagonal, hexagonal honeycomb structures were modeled and monitored using explicit dynamic analysis and finite element method in ABAQUS software to evaluate the dynamic behavior under the effect of underwater explosion. The initial charge during the explosion was ۵۰ kg of TNT, which was exploded at a distance of ۴ meters from the front surface of the structure and underwater. In the later stages, to evaluate the effect of the explosion distance on the behavior of the structure, the charge distance from the structure is changed to ۶ meters. Also, to determine the effect of the explosion load on the behavior of the pier, the response of the structure with a load of ۶۵ kg of TNT was also investigated. In general, ۶ models were modeled in this article using the aforementioned software, which is capable of assigning underwater explosion conditions in its interaction module, and the time history of energy absorption, geometric deformation, structural strain contours, and Mises stress contours were extracted in order to determine the performance level of pressure vessels in this two-phase reaction.

کلیدواژه ها:

Dynamic behavior ، marine piers ، explosion ، sandwich structures ، Abacus