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• W4324334414 abstract "Carbon fiber reinforced plastic (CFRP) and aluminum stacks are widely used in aviation industry due to light weight and high performance. Millions of rivet holes need to be drilled on body materials, and more than 80% of fatigue cracks occur at the connection holes, so the damage and residual stress of hole surface have crucial effect on the riveting fatigue life of CFRP/aluminum stacks and the flight performance. Recently, robotic rotary ultrasonic drilling (RRUD) technology is a promising method to machine the stacks. However, the hole surface strengthening mechanism in RRUD and the service performance of the riveting joint are not verified. Thus, in this paper, the hole surface strengthening mechanism of RRUD for CFRP/aluminum stacks is investigated, a theoretical residual stress model is established, and the fatigue life experiment of riveted joints is conducted. Firstly, analysis on residual stress in RRUD is carried out with consideration of strengthening force and cutting temperature. Residual stress model is established based on the calculation of elastic stress, plastic stress and stress release. Validation experiment results show that ultrasonic vibration changes residual stress from tensile stress to compressive stress. At the same time, comparative damage analysis of CFRP hole exit and hole surface in robotic conventional drilling (RCD) and RRUD is presented. Finally, fatigue strength experiments of riveted joints are conducted for performance verification. Experimental results indicate that fatigue life of single-hole riveted joints is increased by 68% with ultrasonic vibration, and four-hole riveted joint arranged according to aerospace design standards is increased by more than 86%." @default.
• W4324334414 created "2023-03-16" @default.
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• W4324334414 date "2023-03-01" @default.
• W4324334414 modified "2023-09-25" @default.
• W4324334414 title "Hole surface strengthening mechanism and riveting fatigue life of CFRP/aluminum stacks in robotic rotary ultrasonic drilling" @default.
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• W4324334414 doi "https://doi.org/10.1016/j.cja.2023.03.023" @default.
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