Mechanical Characteristic Analysis of Carbon Fiber Reinforced Polymer Bolted Joints

doi:10.12068/j.issn.1005-3026.2025.20230301

Abstract

Abstract:

Aiming at the deformation of carbon fiber reinforced polymer （CFRP） bolted joints subjected to transverse load as well as the loading situation， a model is established to predict the tensile strength of a titanium alloy bolted joint with CFRP plates based on the three-dimensional Hashin failure criterion， in which the load-displacement curve of the CFRP bolted joint from the beginning of loading to complete destruction is divided into five stages， i.e. the stationary stage， the slip stage， the complete slip stage， the bolted rod load-bearing stage and the failure stage. Then， the contact state as well as the mode of load transfer in each stage are analyzed， the magnitude of bending moment and shear force as well as the distribution of the bolted joint at different stages are investigated， and the effects of CFRP thickness and bolt preload on the strength of the joint， bending moment and shear force at the joint are analyzed. The results show that the maximum error between theoretical calculations and simulation results for bending moment and shear force at the bolted joint does not exceed 20% in the slip stage and the complete slip stage， and the maximum error does not exceed 15% in the bolted rod load-bearing stage and the failure stage.

Key words: CFRP, bolted joint, numerical simulation, transverse load, mechanical characteristic

CLC Number:

TB 33

Hai-yan WANG, Yan FENG, Qing-chao WANG, Wan-chun YU. Mechanical Characteristic Analysis of Carbon Fiber Reinforced Polymer Bolted Joints[J]. Journal of Northeastern University(Natural Science), 2025, 46(5): 71-79.

Figures/Tables 10

Table 1 Failure criteria for CFRP in different modes

损伤类型	失效准则
纤维拉伸破坏 $σ 11 ≥ 0$	$e f t = σ 11 X t 2 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1 e f c = σ 11 X c 2 ≥ 1 e m t = σ 22 + σ 33 Y t 2 + σ 23 2 - σ 22 σ 33 S 232 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1 e m c = σ 22 + σ 33 Y c Y c 2 S 23 2 - 1 + σ 22 + σ 33 2 S 23 2 + σ 23 2 - σ 22 σ 33 S 232 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1$
纤维压缩破坏 $σ 11 < 0$
基体拉伸破坏 $σ 22 + σ 33 ≥ 0$
基体压缩破坏 $σ 22 + σ 33 < 0$

Table 1 Failure criteria for CFRP in different modes

损伤类型	失效准则
纤维拉伸破坏 $σ 11 ≥ 0$	$e f t = σ 11 X t 2 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1 e f c = σ 11 X c 2 ≥ 1 e m t = σ 22 + σ 33 Y t 2 + σ 23 2 - σ 22 σ 33 S 232 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1 e m c = σ 22 + σ 33 Y c Y c 2 S 23 2 - 1 + σ 22 + σ 33 2 S 23 2 + σ 23 2 - σ 22 σ 33 S 232 + σ 12 S 12 2 + σ 13 S 13 2 ≥ 1$
纤维压缩破坏 $σ 11 < 0$
基体拉伸破坏 $σ 22 + σ 33 ≥ 0$
基体压缩破坏 $σ 22 + σ 33 < 0$

Fig.1 Geometry of single-lap bolted parts

Fig.2 Comparison between simulated and experimental results of load-displacement curves

Fig.3 Load-displacement curve stages division

Fig.4 Contact state of bolted connections at different stages

Fig.5 Variation of rotational restraint factor with CFRP plate thickness and bolt torque

Fig.6 Comparison of bending moment and shear force at the joint for different CFRP plate thicknesses

Fig.7 Load-displacement curves for different CFRP plate thicknesses

Fig.8 Load-displacement curves for different bolt torques

Fig.9 Comparison of bending moment and shear force at the joint for different bolt torques

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