再论超高周疲劳裂纹萌生特征区
FURTHER EXPLORATION ON CHARACTERISTIC REGION OF CRACK INITIATION FOR VERY-HIGH-CYCLE FATIGUE
查看参考文献41篇
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文摘
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关于合金材料超高周疲劳,笔者提出了裂纹萌生特征区及特征参数的概念,并提出了"大数往复挤压"模型揭示裂纹萌生特征区形成机理.对于高强钢,该特征区为断裂面的细颗粒区;对于钛合金,该特征区为断裂面的粗糙区.近年,关于合金材料超高周疲劳裂纹萌生过程与机理受到疲劳领域广泛关注,并有若干研究新进展.对此,有几个问题需要进一步论述,包括:(1)微结构细化并演化为纳米晶层的裂纹萌生特征区是发生在裂纹形成之前或之后? (2)特征区的形成与加载应力比的关系? (3)特征区纳米晶层的厚度、连续性和微结构细化程度? (4)特征区的形成是否需要真空环境?此外,不同高强合金和不同加载方式的特征区形态也有新的进展.本文将基于近年文献中的结果,对这些问题进行综合论述.本文还简要论述了裂纹萌生特征区概念和大数往复挤压模型的启示,包括:合金材料超高周疲劳特性的评估与预测、提高增材合金材料超高周疲劳性能的途径、制备纳米晶薄层材料的可能性.在郑哲敏先生仙逝一周年之际,以此文告慰我的导师郑先生. |
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其他语种文摘
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With regard to very-high-cycle fatigue (VHCF) of high-strength metallic materials,we previously proposed the concept of crack initiation characteristic region and the related characteristic parameter (IJFatigue 2014,58:144-151),and proposed the numerous cyclic pressing (NCP) model to reveal the formation mechanism of this characteristic region(IJFatigue 2016,89:108-118).This crack initiation characteristic region is so-called fine granular area (FGA) on fracture surface for high-strength steels or rough area (RA) on fracture surface for titanium alloys.In recent years,the investigators in fatigue research field have paid great attention to the topic of crack initiation of VHCF for high-strength metallic materials and obtained new results.Therefore,several issues on this topic are of great interests and are necessary to be clearly addressed.These include:Does the microstructure refinement as well as nanograin formation in crack initiation characteristic region happen before or after crack initiation? What is the correlation between applied stress ratio and the formation of crack initiation characteristic region? What are the details of refined microstructure in crack initiation characteristic region including the thickness and the distribution of nanograins? Is vacuum environment the necessary condition for the formation of crack initiation characteristic region? What are the features of crack initiation characteristic region in different materials or with different loading modes? This article will clarify such issues by the comprehensive review of the recent results in the literature.This article will also briefly describe the important implications of the crack initiation characteristic region concept and the NCP model,which include:the assessment and prediction of VHCF properties for high-strength metallic materials,the approach to improve the VHCF properties of additively made metallic materials,and the possibility of manufacturing thin film metallic materials with nanograin microstructure.Specially,this article is dedicated to the memory of my supervisor Prof.Che-Min Cheng who passed away on August 25,2021. |
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来源
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力学学报
,2022,54(8):2101-2118 【核心库】
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DOI
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10.6052/0459-1879-22-276
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关键词
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超高周疲劳
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裂纹萌生
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特征区
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高强钢
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钛合金
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地址
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中国科学院力学研究所, 非线性力学国家重点实验室(LNM), 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0459-1879 |
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学科
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力学 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:7292447
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参考文献 共
41
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