Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (1): 70-78.doi: 10.13229/j.cnki.jdxbgxb20200738

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Influence on thermal stress of autobody steel-aluminum clinch-adhesive connection structure

Wei-min ZHUANG(),Shen CHEN,Nan WANG   

  1. State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
  • Received:2020-09-25 Online:2022-01-01 Published:2022-01-14

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Abstract:

In view of the influence of temperature change on steel-aluminum clinch-adhesive connection structure during the coating process， the main factors influencing the thermal stress were studied. The high temperature thermal expansion tests were carried out based on the tensile tests and thermal expansion tests of steel， aluminum and adhesive， and the strain value was obtained. The finite element simulation model of thermal expansion of steel-aluminum clinch-adhesive connection structure was established， which was verified by experiments. The stress changes of the joints and the bonding part in the process of heating， heat preservation and cooling were analyzed， and the variation of the overall size of the steel-aluminum clinch adhesive connection structure with temperature in the thickness direction was obtained. The effects of adhesive thickness， bonding width and riveting sequence of metals on the properties of steel-aluminum clinch-adhesive connection structure were studied. The results show that the residual thermal stress and thermal deformation of the structure occur after high temperature. Residual thermal stress and stress concentration and thermal deformation of the whole structure can be reduced by properly increasing the thickness of the adhesive. Increasing the proportion of adhesive width can effectively reduce the residual stress in the joint， but it leads to the increase of plastic deformation in the steel-aluminum clinch-adhesive connection structure. The residual thermal stress of clinch-adhesive joint is smaller when aluminum plate is riveted at the top to steel plate.

Key words: vehicle engineering, steel-aluminum clinch-adhesive connection, material thermal expansion, residual thermal stress, thermal deformation

CLC Number: 

  • U270.4

Fig.1

Dimensions of steel-aluminum clinch-adhesive connection structure（mm）"

Fig.2

Attachment position of strain gauge"

Table 1

Strain value of steel plate and aluminum plate"

位 置钢 板铝 板
测试点125634537
测试点223844434
测试点325034413
测试点425904246
测试点525694195
测试点625454149
测试点725204112

Fig.3

Finite element simulation model"

Fig.4

Dimensions of adhesive tensile specimen（mm）"

Fig.5

Stress-strain curves of adhesive at different temperatures"

Fig.6

Thermal expansion coefficient curve of materials"

Table 2

Material properties parameters"

材 料密度 /（g·cm-3）

弹性模量

/GPa

泊松比
钢7.82100.3
铝2.7700.3
粘接剂1.12—0.35

Fig.7

Temperature loading curve"

Fig.8

Boundary conditions of 1/4 model（mm）"

Fig.9

Thermal strain curve"

Fig.10

Strain curves of steel plate and aluminum plate of simulations and experiments"

Fig.11

Stress distribution in loading process"

Fig.12

Residual stress distribution of steel plate and aluminum plate"

Fig.13

Maximum thermal stress curves of bonding part"

Fig.14

z-direction displacement of steel-aluminum clinch-adhesive connection structure at 200 ℃"

Fig.15

Δt and Δt'curves of steel-aluminum clinch-adhesive connection structure"

Fig.16

Residual stress of clinch joint and bonding part with different adhesive thicknesses"

Fig.17

Variation of center points distance of aluminum plate and steel plate and deformation of whole structure with different adhesive thicknesses"

Fig.18

Residual stress of clinch joint and bonding part with different adhesive widths"

Fig.19

Variation of center points distance of aluminum plate and steel plate and deformation of whole structure with different adhesive widths"

Table 3

Residual stress of each part in different metal clinch sequences"

结构不同部分铝上钢下/MPa钢上铝下/MPa
胶铆接头149.55173.64
钢板12.7711.39
铝板7.448.70
粘接剂50.5451.22

Table 4

Residual deformation of each part in different metal clinch sequences"

热变形量铝上钢下/mm钢上铝下/mm
200 ℃ Δt1.031.03
20 ℃ Δt0.010.01
200 ℃ Δt'5.735.74
20 ℃ Δt'0.070.08
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