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疲劳短裂纹扩展的闭合效应与裂尖塑性区

发表时间:2017-01-15  浏览量:1255  下载量:335
全部作者: 王德强,朱明亮,轩福贞
作者单位: 华东理工大学机械与动力工程学院,承压系统与安全教育部重点实验室
摘 要: 通过短裂纹的原位疲劳试验,结合数字图像相关(digital image correlation,DIC)方法研究裂纹扩展中的闭合效应和裂尖塑性。结果表明,短裂纹扩展存在较明显的闭合现象,加载和卸载阶段的闭合水平相近。考虑裂纹闭合因素提出循环塑性区计算的修正模型,模型预测值同DIC分析结果符合较好。
关 键 词: 疲劳;疲劳短裂纹;裂纹闭合;循环塑性区;数字图像相关技术
Title: Closure and crack-tip plasticity of short fatigue growing cracks
Author: WANG Deqiang, ZHU Mingliang, XUAN Fuzhen
Organization: Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology
Abstract: The crack closure and crack-tip plasticity were investigated based on in situ short crack growth experiment combined with digital image correlation (DIC) technique. Results showed that closure effect existed in short crack growth process, and the level of closure was similar at loading and unloading stages. A revised model for calculating size of cyclic plastic zone was proposed by taking crack closure into account, and the predicted values agreed well with DIC results.
Key words: fatigue; short fatigue crack; crack closure; cyclic plastic zone; digital image correlation technique
发表期数: 2017年1月第1期
引用格式: 王德强,朱明亮,轩福贞. 疲劳短裂纹扩展的闭合效应与裂尖塑性区[J]. 中国科技论文在线精品论文,2017,10(1):63-68.
 
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