鋁合金材料之密度約為鋼材之1/3，也有較高之抗腐蝕性，常應用於高速艇之材料。高速艇結構在鋼材有完整的設計資料，採用鋁合金結構時，其結構設計常從現有鋼材結構設計，以等效降伏強度比例為依據而轉換為鋁合金結構設計，鋁合金結構除了考慮降伏強度外，必須檢討鋁合金電銲結構熱效應區(Heat affected zone,HAZ)，材料強度下降對疲勞強度及極限強度之影響。本文針對一高速三體船結構進行局部疲勞壽命評估。採用Palmgren-Miner 疲勞損害累積法假設去推算結構的疲勞壽命，並探討材料產生初始裂紋時，經過海上航行之循環變動外力作用下，裂紋之擴展速度，以檢視船舶局部構件能否達到疲勞壽命規範之需求，檢討高速三體船之結構設計所需改良之處。並針對船舶之甲板結構受壓縮應力、彎曲力矩下進行極限強度之分析，以及探討壓擠成型三明治甲板結構與傳統肋骨甲板結構之強度差異，評估採用壓擠成型甲板所能減輕結構之重量等。

Recently Aluminum alloy has been applied for high speed vessel because its density is 1/3 of steel, and has good corrosion resistance. For aluminum structure not only the equivalent yield strength need be considered, the strength reduction due to heat affected after welding, and relative lower fatigue strength should be taken account, if the design of aluminum structure member is based on the exsisted desing of steel structure, the fatigue life and the ultimate strength of structure member should be assessed. In this work the Palmgren-Miner rule was used to predict the fatigue life of aluminum of structure member, the crack length within specified time period by the crack growth speed method was also predicted for member with initial crack. After assessment of fatigue strength, the structural member should be modified if its fatigue life is shorter than required service life. Comparrision study of ultimate strength for deck structure between lightweight extrusion deck panel and traditional deck structure by applied displacement control and bending moment control.

中文摘要 I
Abstract III
目 錄 V
圖目錄 IX
表目錄 XVII
第一章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
第二章 鋁合金材料應用於艦艇船舶結構的問題 3
2.1 基本材料力學特性 3
2.2 鋁合金材料特性 6
2.3 鋁合金結構設計問題 9
2.4 鋁合金結構之肋骨加強板結構 10
2.5 鋁合金結構殘留應力與扭曲問題 15
第三章 疲勞強度分析 19
3.1 結構材料疲勞 19
3.2 S/N曲線 21
3.3 鋁合金疲勞 25
3.4 疲勞破裂 27
3.4.1 Palmgren-Miner 疲勞損害累積法假設 28
3.5 船體負載之統計分佈 30
3.6 船體結構疲勞壽命推估範例 34
3.7 裂紋擴張 35
第四章 甲板結構之極限強度分析 39
4.1 鋁合金板模型之極限強度 39
4.2 電銲方式 42
4.3 鋁合金材料特性 44
4.4 甲板強度分析：甲板厚度設計 49
4.4.1 傳統肋骨甲板 49
4.4.2 壓擠成型肋骨甲板 53
4.4.3 車輛及貨物負載之靜力分析結果 56
4.5 甲板肋骨結構件極限強度分析 65
4.5.1 壓縮位移 66
4.5.2 彎曲力矩(Bending)應力 75
4.5.3 小節討論 79
4.6 甲板強度分析：實際尺寸之甲板之極限強度 80
4.6.1 材料特性曲線 80
4.6.2 壓縮負載之應力 80
4.6.3 橫向負載之應力 87
4.6.4 小節討論 92
第五章 全船結構設計與疲勞強度分析 93
5.1 分析船體 93
5.2 分析模型 96
5.3 靜態分析 99
5.4 波浪負載分析 113
5.5 最大整體彎曲力矩造成之結構應力分佈 126
5.6 船體結構極限強度分析 132
5.7 強度檢核 137
5.8 小結討論 144
第六章 結論 145
參考文獻 147

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