7050-T7451干涉螺接双剪接头疲劳寿命与失效模式研究

赵庆云; 陈群志; 黄宏; 崔长京; 肖庆东

doi:10.13433/j.cnki.1003-8728.2015.0531

7050-T7451干涉螺接双剪接头疲劳寿命与失效模式研究

doi: 10.13433/j.cnki.1003-8728.2015.0531

1.
北京航空制造工程研究所, 北京 100024;
2.
北京航空工程技术中心, 北京 100076

详细信息

作者简介:
赵庆云（1969-），高级工程师，硕士，研究方向为航空紧固件的开发及长寿命机械连接技术研究工作，zhaoqy_1997@163.com

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出版历程
- 收稿日期: 2013-08-29
- 刊出日期: 2015-05-05

Fatigue Life and Failure Analysis of 7050-T7451 Interference-fit Double-shear Bolted Joints

1.
Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China;
2.
Beijing Aeronautical Research Center of Engineering & Technology, Beijing 100076, China

摘要

摘要: 针对不同干涉量的7050-T7451双剪接头，进行疲劳试验，对比分析了不同干涉量接头的疲劳寿命。通过扫描电镜（SEM）方法，研究了干涉接头疲劳断口形貌特征。研究结果表明：采用干涉量0.08 mm~0.14 mm对7050-T7451板材双剪接头进行干涉安装，可取得较好的疲劳强化效果，并且在0.11 mm干涉量下，疲劳寿命增益最显著。7050-T7451双剪接头试样疲劳断口呈现混合型穿晶疲劳断裂特征，材料具备一定韧性。干涉螺接对孔壁有强化作用，干涉螺接的试片裂纹源于结构表面，而不源于孔壁，结构表面的改进将有利于疲劳寿命的提高。
- 干涉 /
- 强化 /
- 螺接 /
- 疲劳寿命 /
- 失效分析 /
- 断口 /
- 疲劳裂纹源 /
- 孔
Abstract: Fatigue tests were carried out for 7050-T7451 double-shear joints with different interferences and the fatigue life of joints was analyzed. Fatigue fracture behavior morphology characteristics of interference-fit bolted joints were studied with scanning electron microscope. The results show that 7050-T7451 double-shear bolted joints will obtain long fatigue life with interference of 0.08~0.14 mm, and the fatigue life of the joint with 0.11 mm interference is the longest. The fatigue crack fractography presents hybrid transgranular fracture characteristics and the material of 7050-T7451 has good toughness. Interference-fit bolted jointing can strengthen the wall of hole and make fatigue crack source from the surface of structure, not the wall of hole. The improvement of structure surface can benefit for increasing the fatigue life of joints.
- bolted joints /
- crack fractography /
- design of experiments /
- failure analysis /
- fatigue crack source /
- fatigue life /
- fatigue of materials /
- hole

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参考文献(13)

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