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| 摘要: |
| 金属疲劳裂纹萌生的微细观过程理论认为，最关键的初始阶段是细观先屈服区的形成，这样才能使裂纹萌生的概率条件、晶体学条件和力学条件得到满足。本文利用X-射线衍射法证实了疲劳加载的初始阶段，或在表面或在次表面上存在一个包含若干个晶粒厚度的循环塑性变形层，亦即细观先屈服区。 |
| 关键词: 裂纹萌生 屈服区 循环塑性 金属疲劳 晶粒 表面 晶体学 初始阶段 效应 X-射线衍射法 |
| DOI： |
| 分类号:TG111.2 TG132 |
| 基金项目: |
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| Meso Effect of Fatigue Process in Metals and Its Experimental Verification |
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Wang Renzhi YaoMei Shao Peige
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| Abstract: |
| The mecro-meso-proeess theory of fatigue crack initiation in metals has been shown that the key of the initial process is the formation of the meso-yielding regions, only by which the probabilistic, crystallographic and mechanical conditions for development of strain concentration slip band can be satisfied .By means of X-ray diffration method, the existence of meso-yielding region as thick as several grains, in whicl the cyclic plastic deformaion takes place, has been verified in the present paper. |
| Key words: Fatigue crack initiation, mesoyielding region, strain concentration slip band,fatigue limit |
