臺灣博碩士論文加值系統

船舶於海上航行時，受到海洋波不規則的負荷作用，使船體構件產生
問題。近年來隨著船舶輕量化，高張力鋼之廣泛使用，使疲勞之問題探討
日趨重要。如何有效地評估船體構件之疲勞強度，已是近年來分析船體強
度的重點之一，因此本文將討論有關船體疲勞強度的分析。 對於船體
疲勞強度的分析，主要是採用日本造船研究協會第216研究部會，針對大
型油輪(VLCC)船側縱向肋骨之疲勞強度解析提議之簡易方法。重點亦在避
免繁雜之結構分析(FEM)次數，以達到實用之目的。 在船體結構分析
方面，主要是以分析一艘260K DWT Oil Tanker為主。由流力計算的結果(
Strip Method)，可得到各負荷之短期及長期分佈，並將此結果作為應力
計算時之壓力負荷，以得到構件之長期應力分佈。 至於船體結構的疲
勞分析，則是在推算出構件之長期應力分佈之後，再以S-NCurve進行疲勞
強度分析，以預估船體構件的疲勞壽命。 因此本文以工程應用上之觀
點，對於耐航性能分析、有限元素分析、應力長期分佈統計、疲勞壽命預
估以及疲勞破壞修補，結合成一完整之分析流程，以提昇分析效率，使其
在應用上更加便利。

Due to the irregular loading of ocean wave, the structure
components of ship may have the problem of fatigue strength.
Recently the high tensile steel was widely used for the purpose
of lightening ship, and the study offatigue design is getting
more important. How to check the fatigue strengthof the
structure components of ship efficiently has become an important
subject in analyzing the strength of ship. The
fatigue strength of a 260K DWT Oil Tanker made with high
tensilestrength steel was studied in this thesis. The Strip
method and the finiteelement method were used in the stress
analysis of the Oil Tanker. Thus,we can get the long term
distribution of the stress of the structure.Moreover, we can use
the S-N curve of the material to analysis the fatiguestrength of
the structure as well as predict the fatigue life of
thestructure of the Oil Tanker.