Experimental Research on Strengthening and Fastening for Thick-Section Aluminium Alloy Bolted Joints

Abstract:

For 7050-T7451 plate with the thickness of 16mm, ∅6 hi-bolts were installed with 0.11mm interference by electromagnetic riveting. Split-sleeve cold expansion was employed with 4% expansion. Combine joining of 4% expansion+0.11mm interference was carried out. The effect of strengthening was estimated from microstructure, stress and fatigue life. The results show that the microstructures are the same before and after strengthened. Along the installing direction, materials flow locate near the exit. Residual compressive stresses generate by strengthening process and gradually increase by the process of interference bolted joining, split-sleeve cold expansion and combine joining, within some diameter in the exit. The fatigue lives N₅₀ also gradually increase by the process of interference bolted joining, split-sleeve cold expansion and combine joining.

• Periodical: Advanced Materials Research (Volume 1082)
• Pages: 365-370
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1082.365
• Online since: December 2014
• Authors: Qing Yun Zhao*, Hong Huang, Qing Dong Xiao, Feng Lei Liu
• Keywords: Electromagnetic Riveting, Fastener, Fatigue Life, Hole Cold Expansion, Interference, Mechanical Joining, Residual Stress, Split-Sleeve

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