Waveform and frequency effects on corrosion-fatigue crack growth behaviour in modern marine steels

Igwemezie, Victor; Mehmanparast, Ali

doi:10.1016/j.ijfatigue.2020.105484

Cited by 42 publications

(25 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental methods have been discussed in full elsewhere. 23,39,43 The results of that study, for FCGR tests in air, are shown in Figure 7. Shown also are the typical microstructures of the J2N and TMCP (G10 and G8) steels examined.…”

Section: Fcgrs In Nr and Tmcp S355 Steels In Airmentioning

confidence: 99%

“…The test set-up, loading conditions, crack growth monitoring, estimation and FCGR calculations are presented in detail in other studies. 23,39,43…”

Section: Experimental Materials and Test Conditionsmentioning

confidence: 99%

“…The details of the experimental procedures have been discussed elsewhere. 23,39,43 The experimental results are shown in Figure 16. Three corrosion fatigue crack growth rate (CFCGR) curves, obtained at 12 kN, 9 kN and under 0.3 Hz for the J2N studied by Adedipe et al, 51 were plotted from the data extracted from a versus N curves.…”

Section: Fcgrs In Nr and Tmcp S35steels In Swmentioning

confidence: 99%

“…The corrosioncontrolled domain appears to be strongly influenced by the K max and time of crack tip exposure to the corrosive environment. 43 Figure 19A is a typical nature of the crack path in the J2N steel in SW. Figure 19B is a schematic of Figure 19A. The crack propagated with predominance of low-angle crack tip diversion and very limited low-angle crack branching with the shorter arm in comparison with the TMCP steels.…”

Section: Microstructure and Fcg Path In Sw Under Sinewavementioning

confidence: 99%

See 3 more Smart Citations

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Igwemezie

2020

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

This paper presents a study on the effect of microstructure on the fatigue crack growth (FCG) rate in advanced S355 marine steels in the Paris Region of the da/dN versus ΔK log–log plot. The environments of study were air and seawater (SW), under constant amplitude sinewave fatigue loading. Fundamentally, three phenomena (crack tip diversion, crack front bifurcation and metal crumb formation) were observed to influence the rate of FCG. These phenomena appear to be a function of the material microstructure, environment and crack tip loading conditions. The three factors retarded the crack growth by reducing or redistributing the effective driving force at the main active crack tip. A crack path containing extensively the three phenomena was observed to offer strong resistance to FCG. In SW, the degree of the electrochemical dissolution of the microplastic zone appears to be an additional primary factor influencing FCG in the steels.

show abstract

Section: Fcgrs In Nr and Tmcp S355 Steels In Airmentioning

confidence: 99%

“…The test set-up, loading conditions, crack growth monitoring, estimation and FCGR calculations are presented in detail in other studies. 23,39,43…”

Section: Experimental Materials and Test Conditionsmentioning

confidence: 99%

Section: Fcgrs In Nr and Tmcp S35steels In Swmentioning

confidence: 99%

Section: Microstructure and Fcg Path In Sw Under Sinewavementioning

confidence: 99%

See 2 more Smart Citations

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Igwemezie

2020

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, fatigue fracture of metals and propagation of fatigue cracks depend on stress levels and rates, surface roughness, heterogeneity of microstructure, etc. To an extent, all of these factors are relevant for the growth of fatigue cracks [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

et al. 2020

View full text Add to dashboard Cite

Research was carried out to explore the effect of pulsed electron beam irradiation on the behavior of structure and phase state in AISI 310S steel exposed to high-cycle fatigue. A 2.2 times increase in the fatigue life of samples irradiated by electron beams was revealed. The outcomes of scanning and transmission electron microscopic studies suggest the most probable reason for the fracture of steel samples irradiated by a high-intensity electron beam to be microcraters originating on a treated surface and acting as stress risers initiating the propagation of microcracks. The irradiation with a pulsed electron beam causes extremely fast melting of the surface. As a result of the subsequent rapid crystallization, a polycrystalline structure nearly twice as small as an average grain in the untreated steel is formed. Since a surface layer crystallizes rapidly, crystallization cells ranging from 120 to 170 nm develop in the volume of grains. The fatigue testing is shown to be associated with a martensite transformation γ ⇒ ε in the surface layer. One option to intensify a fatigue life increase of the steel in focus is supposed to be the neutralization of crater-forming on a surface treated by electron beams.

show abstract

Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach

et al. 2020

Self Cite

View full text Add to dashboard Cite

The structural integrity of offshore wind turbine (OWT) support structures is affected by one of the most severe damage mechanisms known as pitting corrosion-fatigue. In this study, the structural reliability of such structures subjected to pitting corrosion-fatigue is assessed using a damage tolerance modelling approach. A probabilistic model that ascertains the reliability of the structure is presented, incorporating the randomness in cyclic load and corrosive environment as well as uncertainties in shape factor, pit size and aspect ratio. A non-intrusive formulation is proposed consisting of a sequence of steps. First, a stochastic parametric Finite Element Analysis (FEA) is performed using SMART© crack growth and Design Xplorer© facilities within the software package ANSYS. Secondly, the results obtained from the FEA are processed using an Artificial Neural Network (ANN) response surface modelling technique. Finally, the First Order Reliability Method (FORM) is used to calculate the reliability indices of components. The results reveal that for the inherent stochastic conditions, the structure becomes unsafe after the 18th year, before the attainment of the design life of 20 years. The FEA results are in very good agreement with results obtained from analysis steps outlined in design standard BS 7910 and other references designated as 'theoretical analysis methods' in this study. The results predict, for the case study, that the pit growth life is approximately 56% of the total pitting corrosion fatigue life. Sensitivity analysis results show that the aspect ratio of pits at critical size plays a significant role on the reliability of the structure.

show abstract

Waveform and frequency effects on corrosion-fatigue crack growth behaviour in modern marine steels

Cited by 42 publications

References 36 publications

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

Fatigue-Induced Evolution of AISI 310S Steel Microstructure after Electron Beam Treatment

Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach

Contact Info

Product

Resources

About