Measurement of atmospheric corrosion fatigue crack growth rates on AA7085-T7451

Free, Brandon; Marino, Gabriella; Schindelholz, Eric John; Dorman, Sarah Galyon; Locke, Jenifer

doi:10.1016/j.ijfatigue.2022.107368

Cited by 5 publications

(17 citation statements)

References 67 publications

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“…Sarah Dorman et al [99] worked on corrosion fatigue under moist air atmospheric conditions in samples with surface salt deposits. The result concludes that the structure and component are often subjected to cyclic loading under moisture conditions, which can lead to fatigue failure.…”

Section: Effect Of Humiditymentioning

confidence: 99%

“…Fracture and fatigue crack growth involve the initiation, expansion, and eventual instability of cracks within materials. In coastal conditions, factors like corrosion, temperature fluctuations, and humidity play critical roles in these processes, as mentioned by Sarah et al [99,108]. In the fracture process, small cracks usually originate at stress concentration points or material flaws and slowly develop under cyclic loading.…”

Section: Fracture Mechanisms In Coastal Environmentsmentioning

confidence: 99%

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Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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Aluminium alloys have been integral to numerous engineering applications due to their favourable strength, weight, and corrosion resistance combination. However, the performance of these alloys in coastal environments is a critical concern, as the interplay between fracture toughness and fatigue crack growth rate under such conditions remains relatively unexplored. This comprehensive review addresses this research gap by analysing the intricate relationship between fatigue crack propagation, fracture toughness, and challenging coastal environmental conditions. In view of the increasing utilisation of aluminium alloys in coastal infrastructure and maritime industries, understanding their behaviour under the joint influences of cyclic loading and corrosive coastal atmospheres is imperative. The primary objective of this review is to synthesise the existing knowledge on the subject, identify research gaps, and propose directions for future investigations. The methodology involves an in-depth examination of peer-reviewed literature and experimental studies. The mechanisms driving fatigue crack initiation and propagation in aluminium alloys exposed to saltwater, humidity, and temperature variations are elucidated. Additionally, this review critically evaluates the impact of coastal conditions on fracture toughness, shedding light on the vulnerability of aluminium alloys to sudden fractures in such environments. The variability of fatigue crack growth rates and fracture toughness values across different aluminium alloy compositions and environmental exposures was discussed. Corrosion–fatigue interactions emerge as a key contributor to accelerated crack propagation, underscoring the need for comprehensive mitigation strategies. This review paper highlights the pressing need to understand the behaviour of aluminium alloys under coastal conditions comprehensively. By revealing the existing research gaps and presenting an integrated overview of the intricate mechanisms at play, this study aims to guide further research and engineering efforts towards enhancing the durability and safety of aluminium alloy components in coastal environments.

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Section: Effect Of Humiditymentioning

confidence: 99%

Section: Fracture Mechanisms In Coastal Environmentsmentioning

confidence: 99%

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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“…When exposed to moist air, contaminant aerosols containing salts can deliquesce to yield surface electrolyte droplets [52,53]. When these electrolyte droplets are wicked into a crack, they have been shown to lead to increased da/dN over that expected from air alone [21,[54][55][56][57]. Speci cally, previous work by the authors showed that da/dN in AA7085-T7451 with 300 µg/cm² of NaCl deposited and exposed to 80% RH can be up to 5× higher than in humid air without surface salt [57].…”

Section: Introductionmentioning

confidence: 99%

“…When these electrolyte droplets are wicked into a crack, they have been shown to lead to increased da/dN over that expected from air alone [21,[54][55][56][57]. Speci cally, previous work by the authors showed that da/dN in AA7085-T7451 with 300 µg/cm² of NaCl deposited and exposed to 80% RH can be up to 5× higher than in humid air without surface salt [57]. This atmospheric environment was also shown to match or exceed da/dN measured while fully immersed in an equivalent salinity bulk aqueous environment [57].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Variable Humidity on Corrosion Fatigue of AA7085-T7451 with Surface Salt Deposits

Montiel,

Free,

Marino

et al. 2024

Preprint

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Corrosion fatigue (CF) crack growth is quantified as a function of relative humidity (RH) using AA7085-T7451 samples with NaCl deposited to understand the effect of deliquesced surface electrolyte droplets on CF performance when humidity varies. Fracture mechanics testing holding mechanical driving forces for cracking constant and incrementally increasing humidity show that crack growth rate (da/dN) more than doubles once RH moves above 78–80% RH. When decreasing RH, some amount of drying below the efflorescence RH (ERH) and/or a sufficient time is needed to pass in order for da/dN to return to that expected for a dry crack tip. All in all, this study establishes time of crack tip wetness as an important parameter for predicting fatigue lifetimes in atmospheric conditions, a parameter that cannot be solely predicted by RH, as accelerated cracking can continue for a limited amount of time even when RH is brought below the ERH.

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“…Understanding crack growth behaviour and the factors influencing it is paramount for confirming the structural integrity and reliability of components subjected to repeated loading. Materials are often exposed to complex environmental conditions [15] that significantly affect fatigue performance in real-world applications [5,16]. Among these conditions, temperature and humidity variations, particularly in coastal environments, play a critical role in finding the extent of crack growth and the overall durability of materials [5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Combined Influence of Temperature and Humidity on Fatigue Crack Growth Rate in Al6082 Alloy in a Coastal Environment

Alqahtani,

Starr,

Khan

2023

Materials

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The fatigue crack growth rate (FCGR) of aluminium alloys under the combined influence of temperature and humidity remains a relatively unexplored area, receiving limited attention due to its intricate nature and challenges in predicting the combined impact of these factors. The challenge was to investigate and address the specific mechanisms and interactions between temperature and humidity, as in coastal environment conditions, on the FCGR of aluminium alloy. The present study conducts a comprehensive investigation into the combined influence of temperature and humidity on the FCGR of the Al6082 alloy. The fatigue pre-cracked compact tension specimens were corroded for 7 days and then subjected to various temperature and humidity conditions in a thermal chamber for 3 days to simulate coastal environments. The obtained data were analysed to determine the influence of temperature and humidity on the FCGR of the Al6082 alloy. An empirical model was also established to precisely predict fatigue life cycle values under these environmental conditions. The correlation between FCGR and fracture toughness models was also examined. The Al6082 alloy exhibits a 34% increase in the Paris constant C, indicating reduced FCGR resistance due to elevated temperature and humidity levels. At the same time, fatigue, corrosion, moisture-assisted crack propagation, and hydrogen embrittlement lead to a 27% decrease in threshold fracture toughness. The developed model exhibited accurate predictions for fatigue life cycles, and the correlation between fracture toughness and FCGR showed an error of less than 10%, indicating a strong relationship between these parameters.

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Measurement of atmospheric corrosion fatigue crack growth rates on AA7085-T7451

Cited by 5 publications

References 67 publications

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

The Effect of Variable Humidity on Corrosion Fatigue of AA7085-T7451 with Surface Salt Deposits

Investigation of the Combined Influence of Temperature and Humidity on Fatigue Crack Growth Rate in Al6082 Alloy in a Coastal Environment

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