Effect of pitting corrosion on fatigue crack initiation and fatigue life

Rokhlin, S. I.; Kim, J.-Y.; Nagy, H.; Zoofan, B.

doi:10.1016/s0013-7944(98)00101-5

Cited by 203 publications

(95 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Harlow and Wei (1994) assumed that the pit took the shape of a semi-sphere and grew at an equal rate at all directions, and obtained the equation of pit depth varying over time. Rokhlin et al (1999) predicted a steadily decreasing rate of pit growth with time. Harlow and Wei (1998) assumed the actual shape of the pit to be half of a prolate spheroid, and proposed three approaches for pit growth: constant aspect ratio, discrete time-dependent aspect ratio and continuous time-dependent aspect ratio.…”

Section: Introductionmentioning

confidence: 97%

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

Huang

2013

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

This paper presents a deterministic model to predict the pit evolving morphology and crack initiation life of corrosion fatigue. Based on the semi-ellipsoidal pit assumption, the thermodynamic potential including elastic energy, surface energy and electrochemical energy of the cyclically stressed solid with an evolving pit is established, from which specific parameters that control the pit evolution are introduced and their influence on the pit evolution are evaluated. The critical pit size for crack nucleation is obtained from stress intensity factor criterion and the crack nucleation life is evaluated by Faraday's law. Meanwhile, this paper presents a numerical example to verify the proposed model and investigate the influence of cyclic load on the corrosion fatigue crack nucleation life. The corrosion pit appears approximately as a hemisphere in its early formation, and it gradually transits from semicircle to ellipsoid. The strain energy accelerates the morphology evolution of the pit, while the surface energy decelerates it. The higher the stress amplitude is, the smaller the critical pit size is and the shorter the crack initiation life is.

show abstract

Section: Introductionmentioning

confidence: 97%

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

Huang

2013

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

show abstract

“…The fatigue life of aluminium alloys has been shown to be significantly reduced when tested in a 3.5% NaCl solution compared to the fatigue life of the same alloy in air. This reduction in fatigue life has been attributed to premature crack initiation from surface pits by Chlistovsky et al [7], Rebiere et al [8] and Rokhlin et al [9], and higher crack growth rate resulting from synergistic interaction of fatigue and stress corrosion as observed by Maeng et al [10].…”

Section: Introductionmentioning

confidence: 98%

Corrosion fatigue behaviour of aluminium alloy 6061-T651 welded using fully automatic gas metal arc welding and ER5183 filler alloy

Mutombo

Toit

2011

International Journal of Fatigue

View full text Add to dashboard Cite

The fatigue life of aluminium 6061-T651 at various applied stress amplitudes in the unwelded and welded condition was found to be significantly reduced on immersion in a 3.5% NaCl simulated sea water solution, compared to that measured in ambient air. The ratio of fatigue life in NaCl test solution to that in air increased as the stress amplitude decreased. The observed reduction in the fatigue life in the NaCl test solution was most likely due to the presence of pits which nucleated on second phase particles or precipitates. Welded joints performed using pulsed gas metal arc welding and ER5183 filler wire failed at the interface between the weld metal and the heat-affected zone as a result of a high pitting rate in this region.

show abstract

“…The crack propagation life is typically obtained from a linear elastic fracture analysis with an initial crack size equal to the depth of the corrosion pit [1][2][3][4]. The crack initiation life may also be estimated by crack propagation analysis until a specific engineering crack [5,6], crack growth rate or stress intensity factor is reached [1][2][3][4]7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Recent efforts have been devoted to enhance the pit model by considering more specific shape factors, accurate stress concentration factors using finite element simulations, and multi-step crack growth hypotheses [3,4]. One of the major drawbacks of these approaches relies on the approximation of the pit shape as hemispherical or semielliptical.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Integrity of Steel Discs with Corrosion Pits

et al. 2018

View full text Add to dashboard Cite

Abstract. Currently, prediction of crack initiation by corrosion pits is only possible by assuming regular geometrical shapes, such as semi-spheres or semi-ellipsoids. Moreover, typical fatigue life diagrams associate the crack initiation life with geometrical features, such as pit depth or aspect ratio, often leading to unsatisfactory correlations due to high pit shape variability and data scatter. In the context of blade-disc fixation in aero engine turbines, this limitation translates into highly conservative life estimations. Therefore, a new crack initiation predictor is formulated based on experimental testing and numerical analysis of 28 artificial corrosion pits. A low-cycle fatigue test campaign is conducted using three-point bending test specimens to simulate maximum takeoff operation conditions of the aero engine and the associated loading of the blade root designed as firtree. An artificial pit is located at the critical point of each test specimen, respectively. The prediction criterion is based on finite element analysis and is formulated as the lowest plastic strain of a plastic region with a certain volume in the corrosion pit. This reference volume is varied until an optimum correlation with experimental crack initiation life is obtained. The criterion shows a superior correlation with crack initiation life compared to pure geometrical parameters such as pit depth.

show abstract

Effect of pitting corrosion on fatigue crack initiation and fatigue life

Cited by 203 publications

References 10 publications

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

Corrosion fatigue behaviour of aluminium alloy 6061-T651 welded using fully automatic gas metal arc welding and ER5183 filler alloy

Mechanical Integrity of Steel Discs with Corrosion Pits

Contact Info

Product

Resources

About