Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2024 , Vol. 58 >Issue 3: 342 - 351

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2022.288

Mechanical Engineering

Influence of Countersink Fillet Radius on Mechanical Performance of CFRP/Al Bolted Joints

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  • 1. Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China
    2. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2022-07-21

  Revised date: 2022-09-12

  Accepted date: 2022-09-16

  Online published: 2023-03-16

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Abstract

Carbon fiber reinforced polymer (CFRP) and aluminum alloys (Al) are widely used in the new generation of commercial aircraft due to their excellent mechanical/physical properties. CFRP/Al countersink bolted structures are important connection forms, where the radius of the countersink fillet affects the mechanical connection performance. The countersink fillet radius is an important factor affecting the mechanical performance of bolted joints. In this paper, the countersink fillet radius is controlled by specially-designed drill-countersink tools with different countersink fillet radii. Meanwhile, the finite element model based on the progressive damage method of composite material is established and utilized to simulate the mechanical performance of different composite/metal bolted joints. The failure mechanism of CFRP/Al bolted joints is analyzed. The results show that the countersink fillet radius can be effectively controlled by specially-designed drill-counterbore tools. The ultimate strength of bolted joints with dimple in the CFRP layer is higher than that in the aluminum alloy layer. In terms of the countersink fillet radius, both CFRP and aluminum alloy materials have the maximum strength when the countersink fillet radius is 1.0 mm. That is, the countersink fillet radius should be slightly larger than the bolt fillet radius, which is conducive to a better mechanical performance.

Key words： carbon fiber reinforced polymer (CFRP); countersink; fillet radius; mechanical joint; finite element method

Cite this article

WANG Xianfeng, ZOU Fan, LIU Chang, AN Qinglong, CHEN Ming . Influence of Countersink Fillet Radius on Mechanical Performance of CFRP/Al Bolted Joints[J]. Journal of Shanghai Jiaotong University, 2024 , 58(3) : 342 -351 . DOI: 10.16183/j.cnki.jsjtu.2022.288

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