Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (1): 131-139.doi: 10.13229/j.cnki.jdxbgxb.20240662

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Stiffness prediction model of thermoplastic composites-metal bonded-riveted hybrid joints

Hong-zhe ZHANG1(),Yu-xin JIA1,Yong-jie BAO2,Yu-xing YANG2()   

  1. 1.Engineering Training Center，Dalian University of Technology，Dalian 116024，China
    2.College of Marine Engineering，Dalian Maritime University，Dalian 116026，China
  • Received:2024-06-14 Online:2026-01-01 Published:2026-02-03
  • Contact: Yu-xing YANG E-mail:zhanghongzhe@dlut.edu.cn;yangyuxing@dlmu.edu.cn

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Abstract:

Given the relatively limited development of analytical models for adhesive-rivet hybrid joints in automotive lightweight design， this paper proposes a load-bearing stiffness prediction model for carbon fiber-reinforced thermoplastic composite-to-metal adhesive-rivet hybrid joints based on spring-mass theory， aiming to deepen the understanding of stiffness in hybrid joint structures. The reliability of the spring-mass model was verified by quasi-static tensile test. Based on the proposed spring-mass model， the effects of adhesive layer thickness， lap length， and rivet hole diameter on the stiffness of the joint structure are discussed. The main conclusions are as follows： with an increase in the thickness of the adhesive layer， both the overall stiffness of the joint and the shear stiffness of the adhesive layer decrease. For every 0.01 mm increase， the shear stiffness of the adhesive layer decreases by about 1.94% on average. Increasing the lap length can improve the overall stiffness of the joint and the shear stiffness of the adhesive layer， but it numerically reduces the stiffness of the metal substrate significantly. As the diameter of the rivet hole increases， both the overall stiffness of the joint and the stiffness of the rivet increase， but the shear stiffness of the adhesive layer is reduced， which affects the joint's connection performance.

Key words: carbon fiber reinforced thermoplastic composites, spring-mass model, bonded-riveted hybrid joint, stiffness prediction

CLC Number: 

  • TG498

Fig.1

Schematic diagram and spring-mass model of single lap bonded-riveted hybrid joint"

Fig.2

Force analysis of mass M4，M5"

Fig.3

Shear stress analysis of connected objects"

Table 1

Mechanical properties of CFRTP"

参数变量数值
纤维方向弹性模量/GPaE1138
基体方向弹性模量/GPaE213.8
面内剪切模量/GPaG123.7
泊松比υ0.3
纤维方向拉伸失效强度/MPaXT2107
纤维方向压缩失效强度/MPaXC814.5
基体方向拉伸失效强度/MPaYT81.4
基体方向压缩失效强度/MPaYC139.8
面内剪切强度/MPaG1234.7

Table 2

Mechanical properties of different materials"

参数304不锈钢

6061-T6

铝合金

Araldite AV

138M/HV998

弹性模量/GPa193694.89±0.81
剪切模量/GPa--1.56±0.01
泊松比0.250.330.35

Fig.4

Size schematic of substrate， adhesive layer and rivet（unit：mm）"

Fig.5

Test equipment and layout"

Fig.6

Load-displacement curves"

Fig.7

Comparison of predicted displacement value ofspring-mass model with experimental data"

Fig.8

Effect of adhesive layer thickness on stiffness"

Fig.9

Effect of lap length on stiffness"

Fig.10

Effect of rivet hole diameter on stiffness"

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