A continuum damage mechanics model for pit-to-crack transition in AA2024-T3

Amiri, Mehdi; Arcari, Attilio; Airoldi, Luca; Naderi, Mehdi; Iyyer, Nagaraja

doi:10.1016/j.corsci.2015.06.009

Cited by 48 publications

(24 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have focused on stress corrosion cracking [6,7], corrosion fatigue [8][9][10] and hydrogen-induced cracking [11][12][13] and erosion-corrosion [14][15][16]. It has been reported that 23-33% of the low-alloy steel weight loss was attributed to the mechano-electrochemical effects, while the number could be 55-62% for austenitic stainless steels [17].…”

Section: Introductionmentioning

confidence: 99%

Mechano-electrochemical modelling of corroded steel structures

Wang

Wharton

Shenoi

2016

Engineering Structures

View full text Add to dashboard Cite

A numerical methodology is established to study the mechanoelectrochemical performance of corroded steel structures under external and internal stresses. Results show that mechanical stimuli (elastic/plastic deformation) increase the local anodic current density, and thus the corrosion behavior dynamically responds to the loading conditions. The current density increment for a multi-component stress system is largely dependent on both hydrostatic pressure and equivalent plastic strain. Moreover, the mechano-electrochemical corrosion is more affected by plastic deformation, resulting in localized areas being more anodic. Existing corrosion introduces extra stress/strain concentration, which further reduces the structural strength capacity and intensifies the corrosion damage. ABSTRACTA numerical methodology is established to study the mechano-electrochemical performance of corroded steel structures under external and internal stresses. Results show that mechanical stimuli (elastic/plastic deformation) increase the local anodic current density, and thus the corrosion behavior dynamically responds to the loading conditions. The current density increment for a multi-component stress system is largely dependent on both hydrostatic pressure and equivalent plastic strain. Moreover, the mechanoelectrochemical corrosion is more affected by plastic deformation, resulting in localized areas being more anodic. Existing corrosion introduces extra stress/strain concentration, which further reduces the structural strength capacity and intensifies the mechano-chemical corrosion damage.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechano-electrochemical modelling of corroded steel structures

Wang

Wharton

Shenoi

2016

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…A model to compute the fatigue life of material (to crack initiation) under corrosion fatigue should takes many variables into consideration: chemical nature of the environment, stress/strain levels, stress ratio and loading frequency. Most investigators agree that CFCI occurs at the surface around corrosion defects [11][12][13][14]. The effect of corrosion on fatigue life of stainless steels is most closely related to the passive film resistance [11,15].…”

Section: Introductionmentioning

confidence: 99%

“…1. competition between pit growth and short crack propagation [1,2], 2. preferential dissolution of plastically deformed material [3,19,20,8,14], 3. local rupture of the passive film by slip bands [4][5][6][21][22][23][24] and 4. lowering of surface energy due to adsorption of specific species from the environment [7].…”

Section: Introductionmentioning

confidence: 99%

Modelling of corrosion fatigue crack initiation on martensitic stainless steel in high cycle fatigue regime

et al. 2018

View full text Add to dashboard Cite

This paper presents an analytical model for assessing the corrosion fatigue crack initiation life on a martensitic stainless steel X12CrNiMoV12-3 in high cycle fatigue regime (between 10 5 and 10 7 cycles). Based on in-situ electrochemical measurements during corrosion fatigue tests in NaCl aqueous solution, the corrosion fatigue crack initiation mechanism was identified. Two main stages were investigated: (i) the fracture of the passive film by slip bands and (ii) the free dissolution of the metal developing fatigue crack initiation from a critical corrosion defect. The depassivation stress threshold corresponds to the median fatigue strength at 10 7 cycles for fatigue corrosion tests. For an applied stress range less than this threshold, the depassivation phenomenon was not observed at 10 7 cycles and no crack initiation occurred. The proposed model takes into account the depassivation process induced by the slip bands emergence at the specimen surface and the corrosion rate under cyclic loading. The experimental results are compared to the proposed model taking into account mechanical and electrochemical material parameters.

show abstract

“…The stress distribution at semi elliptical corrosion pits in steel showed that aspect ratio is the main parameter affecting stress concentration factor . A continuum damage mechanics model for corrosion‐fatigue damage was presented to study the pit‐to‐crack initiation life in AA2024‐T3 . The model was based on the single dominant flaw approach, assuming that although several pits may be present, only 1 pit grows to a critical depth and transitions to a fatigue crack.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre‐corrosion on damage evolution and crack propagation in aluminum alloy 7050‐T7651

Song

Bai

Zhang

et al. 2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

This paper investigates the effects of pre‐corrosion on the tensile behavior of aluminum alloy 7050‐T7651. A combined experimental approach involving digital image correlation, scanning electron microscopy, and tensile testing is presented for quantitative and qualitative analysis. A tensile damage model is presented for plasticity‐induced, post‐corrosion mechanical damage for interpretation and identification of damage and cracking thresholds. Although multiple corrosion‐induced cracks evolve simultaneously in diffuse regions, propagation and coalescence of the main cracks, originating from key damage regions, dominate the failure process. A combined corrosion and mechanical damage model was used to successfully predict the effects of pre‐corrosion on the tensile stress‐strain response.

show abstract

A continuum damage mechanics model for pit-to-crack transition in AA2024-T3

Cited by 48 publications

References 61 publications

Mechano-electrochemical modelling of corroded steel structures

Mechano-electrochemical modelling of corroded steel structures

Modelling of corrosion fatigue crack initiation on martensitic stainless steel in high cycle fatigue regime

Effect of pre‐corrosion on damage evolution and crack propagation in aluminum alloy 7050‐T7651

Contact Info

Product

Resources

About