Impact Response of Metal Sandwich Structure Subjected to Underwater Explosion
Date Issued
2007
Date
2007
Author(s)
Cheng, Kuei-Hua
DOI
zh-TW
Abstract
In the past, the information of impact responses of structures subjected to underwater explosion (UNDEX) were obtained from extremely expansive ship shock experiments, it needs also very long time to prepare the test and to evaluate the test results. The phenomena of ship structure subjected underwater explosion are very complicated, the theoretical approaches are available only for strongly simplified model. Due to the improvement of the computer technologies recently, the numerical methods provide the capabilities to predicate complex UNDEX problems, and can get more detailed information. The traditional ship structures are single hulls in general, only for specified purpose, eq. water tank, oil tank etc, the double hulls are taken into consideration. Because of the development of laser welding technology and the reduce of its investment cost, the laser welding has been adopted by the ship yards world wide progressively. The metal sandwich structures have been proposed to replace the traditional single hull structure with deep stiffness. In this thesis, metal sandwich structures with different types of core structures were studied.
In this thesis, the rectangular plate subjected underwater explosion were carried out by FE-method, First. The plate model (with length width thickness =0.55m 0.45m 0.002m) and water domain (with length width depth =0.6m 0.6m 0.5m) were adopted from the experiment model from Ramajeyathilagam & Vendhan (2004). The results from FE-models and experiment are compared to verify the accuracy of the FE-model. And the influence of the core medium of the double hulls on the impact response of the sandwich structure were examined. Finally, different type of sandwich structures with same mass subjected underwater explosion are performed to compared their impact response and to compare the anti-shock performance.
Subjects
水下爆炸
雙層殼結構
金屬三明治結構
有限元素法
LS-DYNA
任意拉格朗日-尤拉方法
underwater explosion
double hulls
metal sandwich structure
FEM
Arbitrary Lagrangian-Eulerian
Type
thesis
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