| Summary: | 碩士 === 國立成功大學 === 造船及船舶機械工程學系 === 87 === This study do a series fatigue evaluation for the ship local structure. We'll create a formula based on crack propagation to evaluate the fatigue life of the ship local structure; According to the data of the fatigue crack growth for welded structure（da/dN curve） and to the initial crack length of the welded structure, we can evaluate the fatigue life of the welded structure. By the way, we use shipping association ABS,GL to evaluate the fatigue life for the same welded structure. We compare and discuss the evaluated results.
This study also designs an On-Time measurement system. We can use this system to measure the stress(strain) history of the real ship structure sailing on the sea. It can help us to realize and to evaluate the local ship structure's fatigue analysis, and also be the elementary structural safety supervision of the ship in the future.
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