二次弯曲作用下复合层合板螺栓连接的刚度特性

doi:10.13229/j.cnki.jdxbgxb.20231187

摘要/Abstract

摘要：

针对二次弯曲作用下的复合材料层合板单搭接连接结构，提出了一种更准确的螺栓连接刚度模型。首先，通过考虑偏心载荷产生的二次弯曲来计算弯曲刚度。其次，通过ABAQUS有限元软件建立碳-铝单搭接模型，并与M-G模型进行对比。最后，分析摩擦因数、螺栓孔间隙、金属板厚度、铺层顺序等参数对螺栓连接结构各阶段刚度的影响，揭示连接接触面接触状态对螺栓连接结构的影响规律。结果表明：摩擦因数的增大会导致粘滞阶段的临界摩擦力增大，但不影响螺栓连接结构刚度；螺栓孔间隙的增大会导致螺栓孔与螺杆之间的接触面积减小，从而降低螺栓连接结构刚度；金属板厚度对粘滞阶段和接触阶段螺栓连接结构刚度的影响更显著；0°铺层会提高层合板的刚度和承载能力，45°铺层会提升孔周围的抗挤压强度。

关键词: 复合材料, 单搭接连接, 二次弯曲, 刚度, 接触状态

Abstract:

A more accurate bolt connection stiffness model is proposed for the single lap joint structure of composite laminates under secondary bending. Firstly， the bending stiffness is calculated by considering the secondary bending caused by eccentric loads. Secondly， the carbon-aluminum single lap model is established by ABAQUS finite element software and compared with the M-G model. Finally， the influence of friction coefficient， bolt hole clearance， metal plate thickness and ply sequence on the stiffness of bolted connection structure at each stage is analyzed， and the influence of contact state of connection contact surface on bolt connection structure is revealed. The results show that the increase of the friction coefficient will lead to the increase of the critical friction force in the viscous stage， but it does not affect the stiffness of the bolt connection structure. The increase of the bolt hole clearance will lead to the decrease of the contact area between the bolt hole and the screw， thus reducing the stiffness of the bolt connection structure. The metal plate thickness has a more significant effect on the stiffness of the bolt connection structure in the viscous stage and the contact stage. The 0°ply can improve the stiffness and bearing capacity of the laminate， and the 45°ply can improve the compressive strength around the hole.

Key words: composite, single lap joint, secondary bending, stiffness, contact state

中图分类号:

TB332

李玲,江志文,妙东浩,解妙霞,程福安. 二次弯曲作用下复合层合板螺栓连接的刚度特性[J]. 吉林大学学报(工学版), 2025, 55(8): 2520-2529.

Ling LI,Zhi-wen JIANG,Dong-hao MIAO,Miao-xia XIE,Fu-an CHENG. Stiffness characteristics of bolt connection of composite laminates under secondary bending[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(8): 2520-2529.

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材料	弹性模量 /MPa	泊松比	密度 /（g·cm^-3）	剪切模量 /MPa
合金钢	21 000	0.3	8	-
铝	73 100	0.33	2.7	-
CFRP	165 000（E₁₁）	0.35（v₁₂）	1.5	5 080（G₁₂）
	9 300（E₂₂）	0.35（v₁₃）		5 080（G₁₃）
	9 300（E₃₃）	0.487（v₂₃）		3 127.1（G₂₃）