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力学进展 ›› 2018, Vol. 48 ›› Issue (1): 201801-201801.doi: 10.6052/1000-0992-17-002

• 综述评论 •    下一篇

合金材料超高周疲劳的机理与模型综述

洪友士1, 2, 孙成奇1, 2, 刘小龙1   

  1. 1中国科学院力学研究所非线性力学国家重点实验室, 北京 100190;
    2中国科学院大学工程科学学院, 北京 100049
  • 收稿日期:2017-01-16 出版日期:2018-03-25 发布日期:2018-01-22
  • 作者简介:洪友士,博士,中国科学院力学研究所研究员,博士生导师.曾任中国科学院力学研究所所长(1998---2006)、副所长(1994---1998).

A review on mechanisms and models for very-high-cycle fatigue of metallic materials

HONG Youshi1, 2, SUN Chengqi1, 2, LIU Xiaolong1   

  1. 1 LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-01-16 Online:2018-03-25 Published:2018-01-22

摘要:

在循环载荷作用下, 合金材料发生裂纹萌生、扩展直至断裂的周次在107以上的过程被称为超高周疲劳 (very-high-cycle fatigue, VHCF).本综述将从30年前超高周疲劳的研究起源讲起, 直到近年的最新进展.引言之后的内容包括: 超高周疲劳研究的起源, 超高周疲劳的主要特征, 超高周疲劳裂纹萌生特征区和特征参量, 裂纹萌生特征区的形成机理与模型, 超高周疲劳性能预测模型. 在叙述中, 试图回答下列问题: 什么是超高周疲劳?为什么要研究超高周疲劳?超高周疲劳的关键科学问题是什么?超高周疲劳的S-N曲线趋势为什么发生变化?超高周疲劳裂纹为什么萌生于材料 (试样) 内部?裂纹内部萌生的过程和机理是什么? 上述问题有的可以给出明确的回答, 有的则是现阶段的最新结果, 并有待于对问题的继续探索.

关键词: 超高周疲劳, 裂纹萌生, 特征尺度, 疲劳强度, 疲劳寿命, 合金材料参考文献

Abstract:

The process of fatigue failure beyond 107 cycles for a metallic material subjected to cyclic load is called very-high-cycle fatigue (VHCF). This review will summarize the research progress of VHCF starting with its origination in early 1980s, until the cutting-edge development in recent years. After Introduction, this review contains following parts: Origination of VHCF research, Main characteristics of VHCF, Characteristic region of crack initiation and related parameters for VHCF, Formation mechanisms and models for characteristic region of crack initiation, and Prediction models of VHCF properties. The relevant descriptions attempt to answer the following questions: What is VHCF? Why VHCF should be investigated? What are the essential scientific issues for VHCF? Why the tendency of S-N curve for VHCF is changed? Why crack initiates from the interior of material (specimen) for VHCF? What are the process and the mechanism of interior crack initiation? Some of the questions will be clearly answered, but some of them be just addressed by newly results, which require further exploration.

Key words: very-high-cycle fatigue (VHCF), crack initiation, characteristic dimension, fatigue strength, fatigue life, metallic materials

中图分类号: 

  • O346.2