罗鹏博,廖凯,胡俊,李立君,陈飞

• 1:中南林业科技大学机电工程学院

摘要(Abstract)：

首先，通过线切割在7075-T651铝合金表面制备不同裂纹深度的试样，随后对这些试样进行喷丸修复试验；然后，采用拉-拉加载疲劳试验，对喷丸修复的能力进行分析，评价喷丸工艺参数对不同深度裂纹的修复能力；最后，通过对试样裂纹处进行宏、微观观察分析，阐释喷丸对亚表面裂纹修复的机制。结果表明：喷丸强化作用能够在局部增大7075-T651铝合金的塑性变形强度，且由于晶粒间变形滑移使得位错增加而形成局部高温，促使裂开的组织在短时间内在高温高压的作用下能够发生闭合。对50、100和150μm不同裂纹深度试样经喷丸修复后发现，50μm裂纹深度试样裂纹修复后的效果最好，疲劳周期大都优于无裂纹标准试样，而随着裂纹深度的增大，裂纹修复效果会减弱，表明喷丸对7075-T651铝合金亚表面裂纹修复具有积极的作用。

关键词(KeyWords)： 喷丸;裂纹修复;铝合金;疲劳寿命;表面应力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51475483);; 国家重点研发计划(2022YFD2202103)

作者(Author): 罗鹏博,廖凯,胡俊,李立君,陈飞

DOI: 10.13289/j.issn.1009-6264.2022-0646

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