Abstract
In order to improve the joint performance of a titanium alloy rivet connecting aircraft CFRP structure and promote the wide application of ordinary titanium alloy rivets in the aviation field, the ductility of a Ti45Nb rivet was improved using a current-assisted method in this paper. Through experiments, the mechanical behavior and temperature during the riveting process were monitored, and the variation rules of interference and damage were studied in detail. The results show that a current within 16.5 A/mm2 can effectively reduce the riveting pressure requirement, and the maximum engineering stress is reduced by nearly 22%. As the current density increases, the softening effect is obvious, but as the processing time increases, the softening effect has an upper threshold. The current-assisted method can significantly increase the interference fit level, and the uniformity of riveting can be improved by nearly 30%. The outlet burr height of a joint obtained by new technology meets the relevant standards. When the current density is too large or the action time is long, the damage pattern and mechanism at different depths of hole have obvious regional differences.
Highlights
Carbon fiber reinforced polymer (CFRP) has been widely used in the aerospace and aviation fields due to its high specific strength and specific stiffness, and its structural connection technology has attracted much attention [1]
Due to the large forming force of titanium alloy rivets, there are problems, such as easy cracking of the upsetting head and uneven distribution of nail rod interference, which limit the wide application of titanium alloy rivets in aeronautical engineering [4]
The curves ratio the riveting force to the initial nail section area ofarea the of rivet
Summary
Carbon fiber reinforced polymer (CFRP) has been widely used in the aerospace and aviation fields due to its high specific strength and specific stiffness, and its structural connection technology has attracted much attention [1]. Titanium alloy fasteners are often used to replace aluminum alloy fasteners in aircraft composite structural connections to reduce galvanic corrosion between dissimilar materials in the structure [2,3]. Due to the large forming force of titanium alloy rivets, there are problems, such as easy cracking of the upsetting head and uneven distribution of nail rod interference, which limit the wide application of titanium alloy rivets in aeronautical engineering [4]. Exploring a method that can effectively improve the uniformity of the interference distribution and reduce the riveting forming force is the key to promoting the widespread application of ordinary titanium rivets in the aviation field. In the field of currentassisted metal forming, many scholars have studied the deformation ability and forming energy requirements of metal materials during the forming process. Perkins et al [8]
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