现代制造工程 ›› 2026, Vol. 551 ›› Issue (8): 90-95.doi: 10.16731/j.cnki.1671-3133.2026.08.012

• 制造技术/工艺装备 • 上一篇    下一篇

机加工与阳极化顺序对7050-T7451铝合金细节疲劳额定截止值的影响研究*

姜昊1, 杨荣1, 邹鹏2, 刘玄1   

  1. 1 中航通飞华南飞机工业有限公司,珠海 519000;
    2 中国飞机强度研究所强度与结构完整性全国重点实验室,西安 710065
  • 收稿日期:2025-12-02 出版日期:2026-08-18 发布日期:2026-09-01
  • 作者简介:姜昊,硕士,高级工程师,主要研究方向为飞机结构疲劳和损伤容限分析与试验。E-mail:jianghao001@126.com
  • 基金资助:
    *工信部民机预研课题项目(HN-2024-KJ-06004)

Influence of machining and anodising sequence on detail fatigue rating cutoff of 7050-T7451 aluminium alloy

JIANG Hao1, YANG Rong1, ZOU Peng2, LIU Xuan1   

  1. 1 AVIC GA Huanan Aircraft Industry Co.,Ltd.,Zhuhai 519000,China;
    2 National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi'an 710065,China
  • Received:2025-12-02 Online:2026-08-18 Published:2026-09-01

摘要: 7050-T7451铝合金作为航空航天关键结构材料,其疲劳性能直接影响构件可靠性,而细节疲劳额定截止值(DFRcutoff)是评估材料疲劳性能的重要指标,对疲劳寿命分析有重要意义。通过DFRcutoff试验片级试验,对比研究了机加工和阳极化先后顺序对该材料DFRcutoff的影响,试验设计包含先机加工后阳极化和先阳极化后机加工两种方案。结果表明,先阳极化后机加工工艺下的DFRcutoff值显著高于先机加工后阳极化工艺,相对提升幅度为12 %,结合试验结果,提出基于服役环境的工艺顺序适用场景确定原则,可为该材料构件的疲劳设计及工艺优化提供量化依据。

关键词: 阳极化, 7050-T7451铝合金, 细节疲劳额定截止值, 疲劳, 机加工, 顺序

Abstract: As a critical structural material in the aerospace industry,the fatigue performance of 7050-T7451 aluminum alloy directly affects the reliability of components. Detail Fatigue Rating cutoff (DFRcutoff) is a key indicator for evaluating the fatigue performance of materials and holds great significance for fatigue life analysis. The effects of the sequence of machining and anodizing on the DFRcutoff of this material are comparatively investigated via DFRcutoff specimen-level tests. Two test processes are designed, namely machining followed by anodizing and anodizing followed by machining. The results show that the DFRcutoff value under the anodizing followed by maching process is significantly higher than that of the maching followed by anodizing process,with a relative increase of 12 %. Based on the test results,a principle for determining the applicable scenarios of the process sequence according to the service environment is proposed,which can provide a quantitative basis for the fatigue design and process optimization of components made from this material.

Key words: anodising, 7050-T7451 aluminium alloy, detail fatigue rating cutoff, fatigue, machining, sequence

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