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Corrosion fatigue crack growth mechanisms in welded joints of marine steel structures

海洋钢结构焊接接头的腐蚀疲劳裂纹扩展机理

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Abstract

This paper presents a model of fatigue crack growth in a welded joint and a two-dimensional model of anodic dissolution based on Donahue model and anodic dissolution mechanism, respectively. In addition, a model for predicting the corrosion fatigue crack growth rate in welded joints of steel marine structures is established and crack growth mechanisms are analyzed. The results show that during early stages of crack growth, corrosion fatigue crack growth rate in welded joints is mainly controlled by corrosion action, whereas cyclic loading becomes more influential during the later stage of crack propagation. Loading frequency and effective stress ratio can affect rupture period of protective film at the corrosion fatigue crack tip and the length of corrosion crack increment, respectively, which changes the influence of corrosion action on crack growth rate. However, the impact of stress amplitude on crack growth rate is only significant when crack propagation is caused by cyclic loading. Welding residual stress not only improves the effective stress ratio of cyclic loading, but also promotes crack closure and increases corrosion fatigue crack growth rate in welded joints. Compared to corrosion action, welding residual stress has a more significant influence on crack growth caused by cyclic loading.

摘要

本文分别基于 Donahue 模型和阳极溶解机理, 提出了焊接接头疲劳裂纹扩展模型和阳极溶解二维模型。 此外, 建立了预测海洋钢结构焊接接头腐蚀疲劳裂纹扩展速率的模型, 并分析了裂纹扩展机理。 结果表明, 在裂纹扩展的早期阶段, 焊接接头的腐蚀疲劳裂纹扩展速率主要受腐蚀作用控制, 而在裂纹扩展的后期, 受到循环载荷的影响更大。 加载频率和有效应力比会分别影响保护膜在腐蚀疲劳裂纹尖端的破裂时间和腐蚀裂纹扩展长度, 从而改变腐蚀作用对裂纹扩展速率的影响。 但是, 应力振幅对裂纹扩展速率的影响仅在周期性载荷引起裂纹扩展时才显着。 焊接残余应力不仅提高了循环载荷的有效应力比, 而且还促进了裂纹的闭合并提高了焊接接头的腐蚀疲劳裂纹扩展率。 与腐蚀作用相比, 焊接残余应力对循环载荷引起的裂纹扩展的影响更大。

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Abbreviations

SIF:

Stress intensity factor

ΔK :

SIF range

ΔK th :

Threshold of SIF range

\(K_{{\rm{eff}}}^{\max }\) :

Maximum effective SIF

\(K_{{\rm{eff }}}^{\min }\) :

Minimum effective SIF

K res :

SIF increment due to welding residual stress

C, m :

Material constants

Φ 0 :

Complete elliptic integral of the second kind

M s :

Free surface correction coefficient

M T :

Finite thickness correction factor

M k :

Weld toe correction factor

Δσ :

Actual stress amplitude

Δσ eff :

Effective stress amplitude

σ max :

Maximum cyclic stress

σ f :

Flow stress

σ y :

Yield strength

σ u :

Tensile strength

\(\sigma _0^{{\rm{res}}}\) :

Welding residual stress at the crack tip

c :

Semi-elliptical surface crack length

a :

Crack depth

B :

Welded plate thickness

θ :

Parameter related to the residual height of the welded joint

χ :

Shape coefficient

R :

Stress ratio

R eff :

Effective stress ratio

a th :

Fatigue crack growth threshold

b 1 :

Fatigue strength factor

U :

Opening ratio

α :

Stress-strain constraint coefficient

f :

Loading frequency

\({\bar V_{\rm{t}}}\) :

Anodic dissolution crack growth

Q f :

Oxidation charge density

ε et :

Strain rate at the crack tip

εf :

Rupture strain of oxide film

n :

Number of electrons released

F :

Faraday’s constant

M :

Molar mass

ρ :

Metal density

i 0 :

Corrosion current density

λ :

Passivation coefficient of current attenuation

t d :

Passivating time required for generating passivated film

T :

Time of oxide film rupture at the crack tip

w m :

Average width of crack increment

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Authors and Affiliations

  1. College of Field Engineering, Army Engineering University of PLA, Nanjing, 210007, China

    Qian Xu  (徐倩), Fei Shao  (邵飞), Lin-yue Bai  (白林越), Qing-na Ma  (马青娜) & Mei Shen  (申玫)

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  1. Qian Xu  (徐倩)
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Contributions

SHAO Fei provided the concept and edited the draft of manuscript. XU Qian and BAI Lin-yue conducted theoretical analysis. XU Qian conducted manuscript writing, data analysis, and edited the draft of manuscript. MA Qing-na conducted a literature review survey. SHEN Mei conducted data verification and icon verification nuclear.

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Correspondence to Fei Shao  (邵飞) or Lin-yue Bai  (白林越).

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XU Qian, SHAO Fei, BAI Lin-yue, MA Qing-na and SHEN Mei declare that they have no conflict of interest.

Foundation item

Project(2018M643852) supported by the Postdoctoral Science Foundation of China; Projects(30110010403, 30110030103) supported by Equipment Pre-Research Project, China; Project(51979280) supported by the National Natural Science Foundation of China

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Xu, Q., Shao, F., Bai, Ly. et al. Corrosion fatigue crack growth mechanisms in welded joints of marine steel structures. J. Cent. South Univ. 28, 58–71 (2021). https://doi.org/10.1007/s11771-021-4586-0

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