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An interval-energy-based method for lifetime assessment of dissimilar lightweight metal welded joints

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Abstract

In consideration of uncertainties of material characteristics and its welding and forming process, an interval strain energy density method for predicting fatigue life of dissimilar lightweight metal welded joints was presented in this paper. Firstly, the mechanical performance parameters and fatigue properties of welded joints with parental material aluminum alloy 5083H111 and 5754 were obtained by experimental work. Based on the interval number approach, the interval relationship between the elastic and plastic strain energy density and fatigue life was constructed, including lower and upper interval bounds. Then, a finite element model of the dissimilar lightweight metal cross welded joint was generated to calculate the stress-strain response curve under cyclic loadings through the non-linear finite element analysis. The predicted lifetime and failure location for the cross welded joint based on the interval strain energy density method agreed well with the tested results.

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Abbreviations

σ max :

Maximum tensile stress

E :

Young’s modulus

\({\bar \sigma _{ \pm \max }}\) :

Signed maximum equivalent stress

ε p :

Plastic strain

ΔW e+ :

Elastic strain energy density

ΔW p :

Plastic strain energy density

ΔW t :

Total strain energy density

N f :

Fatigue life cycle

A :

Strain energy density coefficient

B :

Strain energy density exponent

X I :

Interval parameter

X C :

Midpoint value of the interval number

y :

Dependent variable log10 (ΔWt)

x :

Independent variable log10 (Nf)

β 1 :

Coefficient for the linear term

β 2 :

Coefficient for the constant term

N :

Number of equation

ε a :

Strain amplitude

K′:

Cyclic strength coefficient

n′:

Cyclic strain hardening exponent

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Acknowledgments

This work is supported by the Natural Science Foundation of Hunan Province (Grant No. 2020JJ6075 and 2020JJ6076 and 2021JJ50042).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hunan University of Technology, Zhouzhou, 412007, China

    Zhengshun Ni, Dong Zhang, Tao Xiong, Chengji Mi, Xiao Sun & Rui Ming

Authors
  1. Zhengshun Ni
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  2. Dong Zhang
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  3. Tao Xiong
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  4. Chengji Mi
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  5. Xiao Sun
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  6. Rui Ming
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Corresponding author

Correspondence to Chengji Mi.

Additional information

Chengji Mi is an Associate Professor at School of Mechanical Engineering, Hunan University of Technology. He has completed Ph.D. in Hunan University. His research interests include fatigue life estimation and optimization design.

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Ni, Z., Zhang, D., Xiong, T. et al. An interval-energy-based method for lifetime assessment of dissimilar lightweight metal welded joints. J Mech Sci Technol 36, 317–324 (2022). https://doi.org/10.1007/s12206-021-1229-1

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  • DOI: https://doi.org/10.1007/s12206-021-1229-1

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