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題名 | 船艦疲勞強度之探討=Study of the Fatigue Strength of Ship Structure |
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作者姓名(中文) | 李雅雯; 薛文證; 劉仲益; 廖飛揚; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 16:2 1997.05[民86.05] |
頁次 | 頁75-84 |
分類號 | 444.1 |
關鍵詞 | 疲勞強度; 長期分佈; 有限元素; Fatigue strength; Long-term; Finite element; |
語文 | 中文(Chinese) |
中文摘要 | 船舶航行於海上,構件受波浪的變動負荷作用而發生疲勞問題。且近年來,由於高張力鋼的大量使用,而得以採用較小的構件尺寸,以致在波浪中的應力變動範圍變大,而降低疲勞壽命,因而疲勞強度的檢驗更顯其重要性。本文的目的,在於建立一個疲勞檢核的分析系統,而此分析系統中包含下列三個部份:1. 結構體之有限元素分析法。2. 構件應力之長期分佈。3. 構件之疲勞強度檢核。由此,將三個獨立的部份加以結合,克服在不同分析系統間,資料格式差異造成傳輸不易處理的缺點,使整個分析流程更完整且合理。文末以一艘4000 TEU貨櫃船為例,說明本分析系統的運作方式與流程。在疲勞檢核時,首先,由結構體之有限元素分析法,得出構件應力轉換函數,其次,利用波譜及海況資料,藉由統計分析, 得出構件長期應力之長期分佈,最後,再以Miner's rule結合S-N曲線資料及應力之長期分佈,進行疲勞強度檢核。 |
英文摘要 | Due to the cyclic loading of ocean wave, the structure components of a ship may fracture because of fatigue. In recent years, high tensile steels have been widely used for reducing the ship weight and the scantling of structure elements. However, high stress range response will reduce the fatigue life of structure components. So, the fatigue checking of the structure components is getting more important. In this paper, we establish the system of the fatigue checking analysis which contains three major portions: 1. The finite element analysis system. 2. The long-term stress of distribution of the evaluated members. 3. The fatigue strength checking of the evaluated members. A 4000 TEU container is considered in the example to explain the analysis process of the system. In the fatigue strength checking, at first, the finite element analsis is used to get the stress amplitude response (RAO) of the evaluated members. Secondary, we calculate the longterm stress of distribution of the member by the wave spectrum and sea conditions. At the last, combining the above two data, we check the evaluated members fatigue strength by using the Miner's linear cumulative damage rule. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。