Shock Response of Structure Subjected to Underwater Explosion
Date Issued
2009
Date
2009
Author(s)
Lin, Bang-Jean
Abstract
The underwater explosion phenomenon, shock wave and the dynamic response of the structures attacked by shock pressure could only be acquired by expansive and time-consuming experiments of underwater explosion in early days. The model of failure mode can only be used once and the available results are often limited; hence, it is necessary to conduct numerous experiments to acquire sufficient data while the costs of the experiment are extremely high. The effective numerical analysis method for underwater explosion can not only reduce the times and the cost of experiments but also improve the prediction abilities of the damage of structures to underwater explosion. Due to the rapid development of computation hardware recently, the application of numerical analysis technique may replace most experiments, and effective solution tools with reasonable models can obtains more usable information. The study was aimed at exploring the characteristics and its application of finite element analysis to the dynamic response of structures subjected to UNDEX. The study was contains three parts; the basic study on the foundmental characteristics of the FEM analysis the verifications and the applications. Firstly, the study explored the quantity control of finite element grids, and the reasonable model of explosive and choose different analytical methods depending on the analysis purposes. Secondly, the study conducted basic research is on the FE models of explosives for underwater explosion and the effects of mesh at water domain on the results of shock pressure. Then a plate model adopted from the experiment model of Ramajeyathilagam and Vendhan (2004) with water domain were established. The analysis results were compared with experiment results.The experimental and numerical studies of three different cylindrical shell structures were performed; which were un-stiffened cylindrical structure, outside cylindrical structure and inside cylindrical structure. The ratio of the experiment model of cylindrical structure is similar in length and width ration of submarine. Finally, the dynamic responses of the traditional stiffened plate structure and various types of sandwich structures attacked by the shock pressure in underwater explosion were conducted. From the results of the anti-shock performance between different types of structures were compared.
Subjects
UNDEX
Metal Sandwich Structures
FEM
SDGs
Type
thesis
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