臺灣博碩士論文加值系統

複合材料積層板具有高強度、耐腐蝕與重量輕的優勢，目前已廣泛運用於船艦結構上遭受水下爆炸攻擊時，複合材料積層板船殼之抗爆能力就相當重要，過去研究水下爆炸之結構抗爆能力，需透過實驗取得資料，不但耗時且成本高。本研究建立一套正確且有效的數值模擬方法，探討複合材料積層板船殼的抗爆震能力，並探討兩種不同船殼受水下爆炸衝擊時的特性及破壞情況。本文探討複合材料與水下爆炸基本理論，利用複合材料積層板受側向均勻負載之準靜態與動態解析解，以求合適的FE模型網格大小並確認數值分析結果的可靠性，並與文獻破壞分析之結果比較，以確認本文模型之正確性，其次分析帽型加強材結構之積層板與無加強材結構之80層之厚積層板的抗爆能力，並針對複合材料實船，分析相同炸藥與半徑下，不同入射角下之抗爆震能力。由結果可知，在船體分析上，網格大小小於10cm*10cm即有相當之準確性，帽型加強材之積層板船殼結構受水下爆炸衝擊時需特別注意加強材之強度。無加強材之厚積層板船殼對於爆震波衝擊後，在完全破壞之前，仍尚有纖維能維持一定強度。最後進行實船分析，在相同炸藥量、相同距離、不同入射角下，結果顯示隨入射角增加，船底板之加速度峰值整體差異不大，但船底板垂向加速度均方根值則隨入射角增加而變大，但隨入射角增加，對於主甲板之垂向加速度峰值與均方根值都是減少的。

The advantages of composite laminates that had been used in the structure of ship hull widely is high strength, anti-corrosion and light weight. The ability of Anti-shock of ship hull made by composite laminates attacked by underwater explosions is very important. In the past years, the dynamic response of structures had studied through the experiment of underwater explosion. It’s not only expensive but also time-consuming. In this paper, we establish a correct and effective numerical simulation to know the ability of anti-explosion of ship hull structures; we discuss the properties and failure situation in two different ship hull structures subjected to underwater explosion. First of all, we study the theory of composite materials and the basic phenomenon of underwater explosion. Next, we use the analytical solution of composite laminates under uniform load to confirm the mesh size and the reliability of the numerical result. In addition, we do the benchmark study in the analysis of failure to make sure the accuracy of finite element model. Finally, we analyze the damage capability of two different structures of ship hull which are 80 layers composite laminates and composite laminates with hat-shaped stiffener. And we analyze the ability of the anti-shock of ship made by composite material in the same explosion charge, standoff distance but in different incident angle. In the result, mesh size is smaller than 10cm*10cm which can be an accurate solution under the analysis of ship hull. After underwater explosion, composite laminates with hat-shaped stiffener must notice the strength of stiffener; 80 layers composite laminates still have a lot of fibers to support the strength of structure before completely destroyed. In the condition of same explosion charge, standoff distance but in different incident angle. As the result, with incident angle increases, there is no significant difference was found in the peak acceleration of bottom plate. But the root mean square value of vertical acceleration of bottom plate is increased with incident angle becomes larger. Both of the peak and root mean square value of the vertical acceleration of main deck are decreased with incident angle increasing.

摘要 I
ABSTRACT II
目錄 III
圖目錄 V
表目錄 XI
第一章 緒論 1
1.1研究動機與目的 1
1.2 文獻回顧 1
第二章 複合材料積層板理論探討 4
2.1 單層板應力與應變關係 5
2.2 單層板任意纖維角度應力與應變關係 6
2.3 古典積層板理論 9
2.3.1位移與應變 10
2.3.2積層板基本構成方程式 12
2.3.3古典積層板理論的運動方程式 13
2.3.4受方波衝擊下的積層板之位移方程式推導 16
2.4 複合材料破壞準則理論 20
2.4.1最大應力準則 20
2.4.2最大應變準則 21
2.4.3 Hill-Tsai破壞準則 21
2.4.4 Tsai-Wu破壞準則 22
2.4.5 Chang-Chang破壞準則 24
2.5 應變率對複合材料之影響 24
第三章 複合材料積層板模擬與網格探討 27
3.1 LS/DYNA理論基礎與計算方法 27
3.1.1時間積分法 27
3.1.2元素型態 29
3.2 複合材料積層板受側向均勻負載分析 29
3.2.1研究模型與網格影響 30
3.2.2驗證結果與討論 33
3.3複合材料積層板受方波衝擊分析探討 36
3.3.1研究模型與網格影響 36
3.3.2分析結果與討論 38
3.4 複合材料積層板破壞分析 41
3.4.1 LS-DYNA破壞分析材料參數 41
3.4.2 拉伸與壓縮破壞分析 43
3.4.3 不同鋪陳角度拉伸破壞分析 47
3.4.4複合材料積層板受側向均勻負載破壞分析 49
第四章 複合材料積層板爆震分析 64
4.1 水下爆炸現象 64
4.1.1 爆震波歷時變化 64
4.1.2 水下爆炸能量分佈 67
4.1.3 水面及水底邊界對衝擊波傳遞的影響 68
4.1.4 龍骨爆震因子 70
4.1.5 衝擊波作用於結構之外力 72
4.2 LS-DYNA對水下爆炸衝擊結構之簡易估算 72
4.3 複合材料積層板受水下爆炸衝擊 73
4.3.1 不考慮流體影響之爆震波衝擊 73
4.3.2考慮流體影響之爆震波衝擊 76
第五章 複合材料積層板船殼結構之抗爆震分析 81
5.1 研究模型A 81
5.2 研究模型B 82
5.3 有限元素模型 83
5.4 研究模型A分析結果 86
5.5 研究模型B分析結果 92
5.6 結果討論 98
第六章 水下爆炸對複合材料船體結構衝擊分析 99
6.1 研究模型及有限元素模型 99
6.2 分析結果 106
6.2.1 CASE1分析結果 107
6.2.2 CASE2分析結果 112
6.2.3 CASE3分析結果 118
6.2.4 CASE4分析結果 123
6.2.5 CASE5分析結果 128
6.3 結果討論 133
6.4 龍骨爆震因子0.8之結構爆震分析比較 138
第七章 結論與展望 145
7.1 結果討論 145
7.2 未來展望 147
參考文獻 148

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