工程结构低周疲劳寿命估算之研究-iBrarian.PDF

工程結構低週疲勞壽命估算之研究 徐慶瑜 摘 要 隨著科技的快速進步，現代工業正朝向高速、高溫及高壓方向發展，因此造成結構破壞的許 多因素隨之產生，其中疲勞（Fatigue ）破壞為重要的一項因素，如何客觀評估結構壽限，作為維 修或新造設計階段之參考，為重要研究課題，有鑑於此，本文建立一套客觀之疲勞壽命估算程序 ，以為評估工程結構疲勞壽命(Fatigue Life)之用。 本文所建立之疲勞壽命評估程序，經與 Julie 等人進行之平板結構承受 10 組負荷譜之疲勞壽 命實驗值驗證，發現其結果與趨勢均相當吻合；本文所建立之疲勞壽命估算程序，可提供未來工 程結構設計及建造時參考使用。 The Study for the Low cycle Fatigue Life Estimation of Engineering Structure Ching-Yu Hsu ABSTRACT Owing to the progress of the sciences and technology, the development orientation of the modern industry is directed to the high speed, high temperature and high pressure field. The fatigue fracture is one of the factors of the structures failures. Therefore, how to accurately estimate the fatigue life of the engineering structure as a valuable reference for maintenance or construction stage is of relevant interest. For this reason, this work presents a novel means of estimating the fatigue life of engineering structure. Comparing our results with those of Julie’s verifies the effectiveness of the fatigue life estimated schedule. These results are obtained from the experimental fatigue life for a plate with the circular hole under ten sets of different load spectra. This phenomenon reveals that the likelihood and accuracy of the fatigue life estimated by this schedule is closely to the experiment results. The fatigue life estimated schedule developed herein could provide the structure designer with an effective tool at design or periodical maintenance stage 壹、緒論 cyclic stress ）或