Chapter 26—Environmental Cracking-Corrosion Fatigue

Schully, JR; Gangloff, Richard P.

doi:10.1520/mnl11032m

Cited by 6 publications

(6 citation statements)

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“…In comparison to fatigue in air, corrosion fatigue is more complex and requires the consideration of more variables such as load frequency and chemical properties of the water. Although the exact contributions to corrosion fatigue remain unclear due to difficulty in differentiating between all mechanisms during experimentation, hydrogen embrittlement and anodic dissolution are commonly identified as the main driving factors (Gangloff 2009;Kang et al 2011;Salivar et al 1981). Hydrogen embrittlement increases crack growth rate by making the material around the crack more brittle.…”

Section: Underwater Fatigue Crack Growth In Steelmentioning

confidence: 99%

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Experimental fatigue evaluation of underwater steel panels retrofitted with fiber polymers

Mahmoud¹,

Riveros²,

Hudak³

et al. 2023

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Many steel structures are susceptible to fatigue loading and damage that potentially threaten their integrity. Steel hydraulic structures (SHS) experience fatigue loading during operation and exposure to harsh environmental conditions that can further reduce fatigue life through stress corrosion cracking and corrosion fatigue, for example. Dewatering to complete inspections or repairs to SHS is time consuming and leads to economic losses, and current repair methods, such as rewelding, often cause new cracks to form after relatively few cycles, requiring repeated inspection and repair. The use of bonded carbon fiber–reinforced polymer (CFRP) to repair fatigue cracks in metallic structures has been successful in other industries; recent work suggests that this method offers a more reliable repair method for SHS. Studies regarding CFRP retrofits of SHS indicate that early bond failure often controls the degree of fatigue life extension provided by the repair. This study aims to extend previous studies and increase the fatigue life of repaired steel components by employing methods to improve CFRP bonding. Additionally, using basalt reinforced polymer (BFRP) instead of CFRP is proposed. BFRP is attractive for SHS because it does not react galvanically and has excellent resistance to chemically active environments.

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Section: Underwater Fatigue Crack Growth In Steelmentioning

confidence: 99%

“…Hydrogen in water absorbs into crack surfaces and interferes with grain boundary cohesion. Anodic dissolution occurs as the newly exposed material from crack growth reacts with the water and is dissolved (Gangloff 2009). In the air, loading frequency has little effect on fatigue crack growth rate in steels.…”

Section: Specimens' Failure Modementioning

confidence: 99%

Experimental fatigue evaluation of underwater steel panels retrofitted with fiber polymers

Mahmoud¹,

Riveros²,

Hudak³

et al. 2023

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“…1. In the following classification when K max < K ISCC the fatigue refers as True Corrosion Fatigue (TCF), where the crack growth is increased by environmental effects, for example, filiform, pitting, exfoliation [12] and the CFCG rate is in the form:…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the SCC is the result of a combination of 3 factors: exposure to a corrosive environment, susceptible material and tensile stresses above a threshold value [1]. Additionally, the reduction of frequency of the cycles or the increase of the load ratio triggers the SCC mechanism [12,13]. There is no unified mechanism for SCC in the literature.…”

Section: Introductionmentioning

confidence: 99%

Titanium alloy corrosion fatigue crack growth rates prediction: Peridynamics based numerical approach

Karpenko

Oterkus

Öterkuş

2022

International Journal of Fatigue

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“…However, the recommended curve for seawater has been proposed based on the mentioned reduction factor. Therefore, the proposed curve has the same slope for the whole region, and this is against the mechanism of corrosion fatigue of steel [2][3][4] which exhibits a larger difference between fatigue lives in corrosive and non-corrosive environments in the VHCF region than the low-cycle fatigue region [2][3][4][5][6][7]. A new theory for fatigue damage assessment is presented recently by Pavlou [8] based on S-N curves.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Strength Curve for Tubular Joints of Offshore Structures under Dynamic Loading

2021

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Offshore structures are subjected to dynamic environmental loads (wave and wind loads). A stress-life fatigue strength curve is proposed for tubular joints which are in the splash zone area of offshore jacket structures. The Det Norske Veritas (DNV) offshore structures standards given design T-curve in the air is modified with the environment-dependent parameters to obtain this fatigue strength curve. Validity of the curve is done by comparing fatigue lives given by the proposed curve with experimental fatigue lives of tubular joints tested in seawater under different loading conditions. The fatigue assessment of a case study tubular joint is performed using the proposed curve. Nominal stress ranges of the members, which are connected to the joint, are obtained by dynamic analysis of the jacket structure. Stress concentration factors are utilized with the nominal stresses to obtain the hot spot stress ranges. Fatigue lives are calculated and compared with the conventional approach. Hence the applicability and significance of the proposed fatigue strength curve are discussed.

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Chapter 26—Environmental Cracking-Corrosion Fatigue

Cited by 6 publications

References 0 publications

Experimental fatigue evaluation of underwater steel panels retrofitted with fiber polymers

Experimental fatigue evaluation of underwater steel panels retrofitted with fiber polymers

Titanium alloy corrosion fatigue crack growth rates prediction: Peridynamics based numerical approach

Fatigue Strength Curve for Tubular Joints of Offshore Structures under Dynamic Loading

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