ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Interference-fit evenness riveting method based on symmetrical loading
Received date: 2015-01-30
Revised date: 2015-04-27
Online published: 2015-05-25
Supported by
Shaanxi Science & Technology Co-ordination & Innovation Project(2015KTCQ01-83);Aeronauical Science Foundation of China(2015ZE53065)
Evenness of riveting interference plays an important role in fatigue life of aircraft assembly joints, which is also one of the main reasons causing riveting structure deformation. With the purpose of improving the evenness of riveting interference, a research on symmetrical loading riveting process method is carried out, based on the symmetrical electromagnetic riveting with stress wave loading. In this paper, the rivet theoretical stress level under symmetrical loading is derived through propagation and superposition principle of stress wave, and electromagnetic guns' stress wave and superposition principle of stress wave are recorded through the experiment. With the riveting experiments and micro-analysis of riveting structure, the riveting quality is also studied under symmetrical loading. The results show that under symmetrical loading, the stress waves of two riveting guns simultaneously trigger with the same pulse length, and the rivet theoretical stress level is higher than that under uniaxial loading. Under the symmetrical stress wave loading, the overall deformation of rivet is uniform, forming an effective interference through the whole rivet, and rivet head and interlayer joint closely. The average level of interference is larger than the interference under uniaxial loading by 14%. Moreover, the average interference evenness increases by 37.5% under symmetrical loading which makes for achieving high fatigue life of aircraft assembly joints. The riveting structure deformation is smaller under symmetrical loading, doing good to ensure assembly accuracy.
Key words： symmetrical loading; riveting; interference-fit; interference; evenness; fatigue life
ZUO Yangjie , CAO Zengqiang , YANG Liu , ZANG Chuanqi . Interference-fit evenness riveting method based on symmetrical loading[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(3) : 1049 -1059 . DOI: 10.7527/S1000-6893.2015.0113
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