Corrosion Fatigue of Metals in Marine Environments

Jaske, Carl E.; Payer, Joe H.; Balint, V S

doi:10.21236/ada107247

Cited by 44 publications

(22 citation statements)

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“…5. where h, can be calculated by substituting t = to into equation (1). Therefore the design life t, can be determined as t d = to + t,.…”

Section: Pitting Corrosion Type Alloysmentioning

confidence: 99%

“…On the other hand, for pitting corrosion type alloys such as aluminium alloys and stainless steels, a pit depth can be estimated empirically by h = b . t " (1) where h = pit depth (mm) t = time (s) and 6, n = parameters related to material-environment systems [ 101.…”

Section: Prediction Of Changes In a Metal Surfacementioning

confidence: 99%

“…[ 1,2]. Therefore the estimation of corrosion fatigue strength of materials, operating under corrosive environments for long periods, is very difficult.…”

Section: Introductionmentioning

confidence: 99%

“…When a time-dependent corrosion process is superposed on fatigue, the corrosion fatigue strength is affected by load frequency, load wave-form, crevices, galvanic couples, etc. [ 1,2]. Therefore the estimation of corrosion fatigue strength of materials, operating under corrosive environments for long periods, is very difficult.…”

Section: Introductionmentioning

confidence: 99%

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Considerations of Allowable Stress of Corrosion Fatigue (Focused on the Influence of Pitting)

Kawai

Kasai

1985

Fatigue Fract Eng Mat Struct

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Long life corrosion fatigue behaviour is discussed. The importance of (i) quantification of corrosion pit depth (or surface roughness caused by corrosion) as a function of service period and (ii) corrosion pit modelling is emphasized. Extreme value statistics is useful for corrosion pit depth quantification. It is demonstrated that a corrosion pit can be treated as an elliptical crack with the same depth and surface length as a pit. From these considerations, a method for determination of a reasonable allowable stress in corrosion fatigue is proposed. Finally, an example of an allowable stress is given, i.e. the allowable stresses of a real machine component under rotating bending stress are determined from estimation curves of pit depth together with corrosion fatigue crack growth data. NOMENCLATURE a = crack length area = projected area of a hole on a horizontal plane b, C, C i , C2, ho, m, n, a , , a2 = constants d = pit (or hole) diameter f = frequency F = correction factor h = pit (or hole) depth h, = pit depth, at which corrosion fatigue crack growth starts h,,, = maximum pit depth hf= final depth of crack AK = stress intensity factor range K,,, = maximum stress intensity factor AK,, = threshold stress intensity factor range (for R > 0) KmaX.,, = threshold stress intensity factor (for R < 0) AKtaCF = threshold stress intensity factor range in corrosive environments (for R > 0) Kmai,th,CF = threshold stress intensity factor in corrosive environments (for R < 0) AK,,, = allowable value of AK,,.,, Kall = allowable value of Kmar,th,CF N, = number of cycles to failure R = stress ratio ( = urmn/amai) r = correlation coefficient S = safety factor t, = design lifetime rf= fatigue crack growth period T = stress increasing time (or stress rise time) in a stress cycle Aa = stress range Au,,, = allowable stress range (for R z 0) amax = maximum stress AuW = stress range at the fatigue limit in tension or bending ( R > 0) Aa; = Aa,,, for h = 0 u,,,~~,~,, = allowable maximum stress (for R < 0)Authors' proposal uw = maximum stress at the fatigue limit in tension or bending ( R < 0) c&=u, for h = O uWCF = fatigue limit in tension or bending under corrosive environments ( R < 0) uLcF = uWCF for h = 0 T~ = fatigue limit in torsion ( R < 0).

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“…5. where h, can be calculated by substituting t = to into equation (1). Therefore the design life t, can be determined as t d = to + t,.…”

Section: Pitting Corrosion Type Alloysmentioning

confidence: 99%

Section: Prediction Of Changes In a Metal Surfacementioning

confidence: 99%

“…[ 1,2]. Therefore the estimation of corrosion fatigue strength of materials, operating under corrosive environments for long periods, is very difficult.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Considerations of Allowable Stress of Corrosion Fatigue (Focused on the Influence of Pitting)

Kawai

Kasai

1985

Fatigue Fract Eng Mat Struct

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“…The exfoliation corrosion (EXCO) on 2024 T3 aluminium alloy (Leybold et al, 1958;MIL-HDBK-5H, 1998) is a specifically severe inter-granular corrosion type that influences material properties and fatigue characteristics. Properties variation is investigated in Alexopoulos, and Papanikos (2008) to Voris and Min-Ten (1990) for the case of pre-existent corrosion, while fatigue life reduction of the same alloy in air and in artificial seawater for rotating bending load is presented in Jaske et al (1981) without analytical correlation. Some results on prior pitting corrosion are also presented but fatigue load is applied subsequently in air.…”

Section: Introductionmentioning

confidence: 99%

Preliminary evaluation of the fatigue behaviour of aluminium alloy in corrosive environment

Frulla

Avalle

Sapienza

2015

Aircraft Eng & Aerospace Tech

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Purpose -The purpose of this paper is to investigate the effect of fatigue life reduction of 2024 Al alloy for aerospace components due to the corrosive (exfoliation) environment. Both standard fatigue tests on prior corroded samples and fatigue tests conducted with the samples in corrosive solution are developed to define some guidelines for the inclusion of such effect in design and to improve aircraft life management. Design/methodology/approach -The effect of corrosion is taken into consideration, introducing specific concentration factors into the life estimation relationship. Differences between fatigue in corroded specimens and fatigue in presence of corrosive environment are emphasized. No crack propagation is considered. Two alternative procedures are considered in the analysis: "a-procedure" based on maximum stress calculated on un-corroded sample section; "b-procedure" based on stress calculated on final residual section, including corrosion. Findings -Related concentration factors are derived and compared by the experimental results with the aid of an original proposed a "power law". Typical power law (square kt) has been derived to cope with the coupling effect of fatigue and corrosive environment. Research limitations/implications -The original approach developed in the paper is based on few samples. For this reason, the conclusions are addressed as tendency behaviour. Practical implications -The combined effect of fatigue load acting in presence of corrosive environment reveals an important reduction in fatigue life that cannot be determined by means of classical fatigue tests performed on prior corroded samples. Social implications -Specific design updating procedure can be determined to cope with ageing of structures during service improving structural integrity. Originality/value -The derivation indicates a substantial equivalence of the considered two procedures both in the case of prior corroded samples and in combined situation. This tendency is consistent with the available data results. Original analytical relations are introduced to manage such kind of combined effect revealing consistency of data also if few samples were tested.

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Environmentally Enhanced Fatigue

Burns

Munger

2022

LaQue's Handbook of Marine Corrosion

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Corrosion Fatigue of Metals in Marine Environments

Cited by 44 publications

References 0 publications

Considerations of Allowable Stress of Corrosion Fatigue (Focused on the Influence of Pitting)

Considerations of Allowable Stress of Corrosion Fatigue (Focused on the Influence of Pitting)

Preliminary evaluation of the fatigue behaviour of aluminium alloy in corrosive environment

Environmentally Enhanced Fatigue

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