文章基本信息

标题：The Observation and Interpretation of Crack Closure under Plain Fatigue Conditions
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作者：Pengbo Qi ; Enrico Salvati ; Robert Paynter 等
期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2018
卷号：2235&2236
页码：623-625
出版社：Newswood and International Association of Engineers
摘要：This paper reports the results from a set of fatigue experiments carried out on Aluminium alloy 6082-T6 Compact Tension specimens. Crack closure near the tip was observed and interpreted under cyclic loading. In order to interpret the observations, two models were used in the present study, namely, the elastic crack tip field based on the Westergaard stress function approach that provides the expression for crack opening displacement perpendicular to the crack path; and the second model based on elastic-plastic assumptions, as proposed by Pommier. With the introduction of plastic length ρ, both the elastic and plastic contributions to crack tip strain are accounted for. Digital Image Correlation and conventional strain gauges were used to monitor crack closure. For interpretation in terms of the stress intensity factor (SIF), excluding DIC markers lying very close to the crack tip was found to improve the accuracy.
关键词：DIC; crack closure; crack tip; stress intensity; factor