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自从1870年德国人Wohler第一次测绘了S/N曲线并建立疲劳极限定义以来,疲劳强度学已发展为一门内容非常广泛的学科。电子显微镜的发明及其应用,疲劳微观机制的研究有了重大的进展,人们对疲劳的认识也趋于深刻。不过,人们早期所遇到的疲劳现象是一种高周疲劳,即其破坏时的循环周次比较高。随着科学技术与生产的发展,人们发现了低周疲劳。“低周疲劳”就是材
Since the German Wohler first plotted the S / N curve in 1870 and established the definition of fatigue limit, fatigue strength theory has developed into a very wide range of disciplines. The invention of electron microscope and its application, the study of fatigue micro-mechanism has made significant progress, people’s understanding of fatigue tends to be profound. However, the phenomenon of fatigue encountered by people early is a kind of high-cycle fatigue, that is, the cycle cycle when it is damaged is relatively high. With the development of science and technology and production, people find low cycle fatigue. “Low cycle fatigue” is the material