Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (4): 1190-1197.doi: 10.13229/j.cnki.jdxbgxb20200503

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Equivalent modeling of tensile-shear behavior for friction stir spot welding joints

Xin CHEN(),Gui-shen YU,Biao ZHANG,Kai-xuan PAN,Li-fei YANG   

  1. State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
  • Received:2020-07-04 Online:2021-07-01 Published:2021-07-14

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Abstract:

In this paper, an equivalent modeling method of the cohesive zone weld model (CZWM) is proposed for the simulation of the most dominant tensile-shear loads in automotive body welds. Based on the measurement results of the initial damage and fracture energy from single spot weld joints through tensile-shear and multi-angle tension, an equivalent model of the joint is established. The model is in good agreement with the experimental results of the single spot weld joint in tensile-shear process. At the same time, the effectiveness of the CZWM is verified by three kinds of double weld joints. The results show that the maximum deviation of CZWM in tensile-shear failure load (TSFL) and failure displacement (FD) is 9.3% and 7.1% respectively. When the distribution of welds is parallel to the direction of the external load, the bearing capacity is the highest, the vertical is the lowest, and the diagonal is in the middle. This model provides an option for the numerical simulation of the mechanical behavior in automotive body FSSW welds.

Key words: vehicle engineering, friction stir spot welding, cohesive zone weld model, tensile-shear behavior, failure load, welds distribution

CLC Number: 

  • U41

Fig.1

Cohesion zone model at crack tip"

Fig.2

Traction-displacement and stress-displacement models of CZM"

Fig.3

Dimensions of test specimen"

Fig.4

FSSW gantry system and physical images of used welding tool"

Fig.5

Multi-axial tensile strength tests"

Fig.6

Stress components in axial and tangential directions of tensile-shear and multi-angle tensile strength in SSW joints and their fitting curve"

Fig.7

Load and boundary conditions of SSW joint （t1=t2=2 mm， L=180 mm， W=c=40 mm）"

Fig.8

Loading FEM model of SSW joint in CZWM"

Fig.9

Distribution of CSDMG function in overlap area during stretching"

Fig.10

Load-displacement curves for experimental and numerical simulation of SSW joints"

Fig.11

Schematic diagram of the structure and size of three types of dual spot weld joints"

Fig.12

Experimental displacement-load curves for four types of joints （SSW， SDSW， PDSW and DDSW）"

Fig.13

FEM of three types of double-spot joint"

Fig.14

Numerical simulation results of load-displacement for four types of joints and comparison of numerical simulation and experimental results on TSFL and FD"

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