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Title: | 船體雙層殼結構碰撞破壞分析 Failure analysis of double hull structure in ship collision |
Authors: | Jian-Bang Chen 陳建邦 |
Advisor: | 洪振發 |
Keyword: | 船舶碰撞,拉伸破壞,穿透破壞,摺皺破壞,壓潰破壞,雙層殼, ship collision,stretching mode,perforating mode,denting mode,double hull, |
Publication Year : | 2006 |
Degree: | 碩士 |
Abstract: | 碰撞與擱淺可造成船舶與海域結構的重大傷害,連帶油污外洩造成海洋生態浩劫,為防止此種災難發生或將災害降低至最少,美國海岸巡防署在15年前即強力導入油輪雙層殼設計以避免油輪船側遭撞擊時,外殼破裂導致油污外洩。船舶撞擊是非常複雜的力學問題,船舶不止包含多種不同的構件,同時各構件可能會有不同的破壞模式,因此過去許多學者為了分析船舶撞擊問題,把船舶的破壞型式歸納成幾種基本的破壞模式,然後再利用合理的簡化力學模型推導出簡化估算方法。雙層殼結構含有外殼、內殼以及緃橫交錯的構件,需先瞭解各構件之力學行為及其交互行為,才能作合理的簡化。本文推導船殼在受到側向撞擊產生的拉伸破壞與穿透破壞模式;肋骨受到腹板平面之面內方向撞擊產生摺皺破壞模式與撞擊點在交叉肋骨產生的壓潰破壞模式,等估算結構抗撞阻力的簡化公式並與有限元素分析作一比較。最後針對Wang(2000)實驗的雙層殼模型以有限元素分析檢討各部位破壞的過程,同時以本文估算式推算抗撞阻力與實驗結果進行比較,顯示本文的估算式計算結果在可接受範圍。 Collision and grounding may cause serious injury of ship structure and oil pollutions on the sea. In order to prevent this kind of disaster and reduce the loss, the US Coast Guard introduced the design of double-hull tankers to avoid the leakage of oil from the struck ship fifteen years ago. The mechanics of ship collision and grounding are very complex topics because the complexity of ship structure, and multiple failure modes may occurred for damaged parts. In the past decades, the damage modes have been categorized into different fundamental modes, and the approximated methods have also been developed based on the combinations of suitable fundamental modes. The structures of double-hull tanker includes side plate, inner plate, stiffeners, web frame, decks and girder, it is necessary to understand the failure mechanism of each component and the interaction of each part. In this paper the formulae to approximate the energy dissipation and the impact resistance of a stuck double-hull structure based on Stretching mode and folding mode have been derived. The denting mode of girder and crushing mode of the crossing girder also been discussed. In this paper FEM analysis were compared with the simplified estimate formulae. The double-hull models from Wang(2000) was selected as care study. The damage process of double-hull structures was analyzed by FEM, the result of experiment, FEM analysis and simplified estimate formulae are compared. The results show that the proposed approximate method have acceptable accuracies. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31606 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 工程科學及海洋工程學系 |
Files in This Item:
File | Size | Format | |
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ntu-95-1.pdf Restricted Access | 2.87 MB | Adobe PDF |
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