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Experimental and Numerical Investigation of Stress Concentration Factor of Cable Steel Wire with Corrosion Pits

  • Structural Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Fatigue crack initiates from corrosion pits in various metallic structures, leads to the decline of the fatigue life. In the present study, the effects of the width, depth, angle and spacing of primary and secondary pits on failure mechanism and stress concentration factor are investigated by the experimental and numerical analysis. The results show that depth-width ratio of corrosion pits is the critical factor that affects the dangerous area and stress concentration factor. The development of secondary pits will lead to the multiplier effect of stress concentration factor. The maximum stress is basically located at the mouth or middle part of secondary pits. In addition, the pit angle does not change the distribution of dangerous area, but with the pits angle increasing, the stress concentration factor increases as a whole. The contours that classical butterfly-like distribution rotates and the rotation angle is basically the same with that of the corrosion pits. Furthermore, with the pits spacing increasing, the stress concentration factor increases gradually and converges to the fixed value, which is equal to the stress concentration factor under the single pit. Finally, the relationship between the pits parameters and stress concentration factor is systematically predicted.

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Abbreviations

b :

Pit length

H :

Diameter

H 1 :

Depth of primary pit

H1/W1 :

Depth-width ratio of primary pit

H 2 :

Depth of secondary pit

H2/W2 :

Depth-width ratio of secondary pit

K t :

Stress concentration factor

L :

Distance of pits centerlines on the different sides

Puave :

The average ultimate load of the test

PuFEA :

The ultimate load of the finite element

Pyave :

The average yield load of the test

PyFEA :

The yield load of the finite element

R 2 :

Goodness of Fit

W 1 :

Width of primary pit

W 2 :

Width of secondary pit

δu :

The error of the ultimate load

δ y :

The error of the yield load

θ :

Pit rotation angle

σnominal :

Nominal stress

σpeak :

Peak stress

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Acknowledgements

The financial support provided by National Natural Science Foundation of China under Grant Nos. 51778135 and 51078080 is highly acknowledged. The authors also would like to express the gratitude to the reviewers for careful comments.

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Authors and Affiliations

  1. School of Civil Engineering, Southeast University, Nanjing, 210096, China

    Rou Li, Chang-qing Miao & Mei-ling Zhuang

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  1. Rou Li
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  2. Chang-qing Miao
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  3. Mei-ling Zhuang
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Correspondence to Rou Li.

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Li, R., Miao, Cq. & Zhuang, Ml. Experimental and Numerical Investigation of Stress Concentration Factor of Cable Steel Wire with Corrosion Pits. KSCE J Civ Eng 24, 1581–1592 (2020). https://doi.org/10.1007/s12205-020-1787-2

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  • DOI: https://doi.org/10.1007/s12205-020-1787-2

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