复合材料沉头衬套螺栓干涉连接渐进损伤数值模拟分析方法

doi:10.3901/JME.2025.07.156

摘要/Abstract

摘要： 强度增益的衬套式干涉连接技术已成为碳纤维增强复合材料结构的先进连接技术之一，然而在复杂轴、径向安装载荷下，衬套容易发生非均匀塑性变形，从而导致不均匀的损伤分布，降低连接质量。对CFRP沉头衬套螺栓干涉安装进行了试验研究，提出基于应变3D-Hashin准则和连续刚度退化理论的渐进损伤模型，用于模拟CFRP干涉安装层内损伤行为，并采用内聚力模型揭示CFRP分层损伤起始与扩展。结果表明：有限元模型与试验结果拟合度较好，沉头衬套材料在安装过程中向出口处流动堆积，孔壁径向位移沿安装方向逐渐增大；孔壁出口处损伤最为严重，基体压缩损伤面积最大，其与孔壁径向位移分布趋势相似；衬套螺栓的设计干涉量为3%时，能在降低制孔精度的要求下有效控制干涉安装损伤。

关键词: 衬套式干涉连接, 非均匀塑性变形, CFRP, 渐进损伤模型, 干涉量

Abstract: The strength-enhancing interference-fit sleeved bolt joint has evolved into a advanced joint design for carbon fiber reinforced polymer(CFRP) structures. However, under complex axial and radial installation loads, the sleeve is prone to non-uniform plastic deformation, leading to uneven damage distribution and reduced joint quality. An experimental study is conducted to investigate the installation behavior of CFRP interference-fit joint with sleeved bolt. A progressive damage model based on the strain-based 3D-Hashin criterion and continuous stiffness degradation theory is proposed to simulate the intra-laminar damage behavior of CFRP during interference-fit installation. Additionally, a cohesive zone model is employed to reveal the initiation and propagation of delamination. The results indicated that the finite element model showed good agreement with the experimental results. During installation, the countersunk sleeve material is flowed and accumulated towards the exit, with the radial displacement of the hole wall gradually increasing along the installation direction. The damage is most severe at the hole wall exit, with the largest area of matrix compression damage, which follows a distribution trend similar to the radial displacement of the hole wall. When the interference-fit size of the sleeved bolt is designed to be 3%, it can effectively control interference installation damage while reducing the hole-making precision requirements.

Key words: interference-fit joint with sleeved bolt, non-uniform plastic deformation, CFRP, progressive damage model, interference-fit size

中图分类号:

TB330

王岚, 樊宇航, 程晖. 复合材料沉头衬套螺栓干涉连接渐进损伤数值模拟分析方法[J]. 机械工程学报, 2025, 61(7): 156-166.

WANG Lan, FAN Yuhang, CHENG Hui. Numerical Simulation Analysis Method of Progressive Damage for Composite Interference-fit Joint with Countersunk Sleeved Bolt[J]. Journal of Mechanical Engineering, 2025, 61(7): 156-166.

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