Experimental and numerical investigation of residual stress effects on fatigue crack growth behaviour of S355 steel weldments

Jacob, Anaïs; Mehmanparast, Ali; D'Urzo, Riccardo; Kelleher, Joe

doi:10.1016/j.ijfatigue.2019.105196

Cited by 48 publications

(20 citation statements)

References 23 publications

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“…In many reports, [3][4][5][6][7][8][9][10] microstructure, mean stress, residual stress, mechanical properties and initial crack length were said to have large influence on the threshold and final failure regions. In addition, the accelerated region is said to be influenced by sample thickness.…”

Section: Introductionmentioning

confidence: 99%

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

Igwemezie

2020

Fatigue Fract Eng Mat Struct

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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.

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Section: Introductionmentioning

confidence: 99%

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

Igwemezie

2020

Fatigue Fract Eng Mat Struct

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“…As depicted in Figure 6, there is a wide scatter in the fatigue crack growth rate in the threshold region for both the results predicted by the experiment and the FEA SMART© analysis tool. However, along the Paris' region, that is, after the threshold region, the test data points are seen to be dispersed around the best fit line of the experimental data such that it aligns in and can be represented by a straight line 54,65,71–79 . From the foregoing, it can be inferred that there is reasonable agreement between the test results and the FEA SMART© analysis results predicted.…”

Section: Resultsmentioning

confidence: 64%

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

et al. 2020

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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.

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“…Also seen in this figure is that the upper bound FCG rates in ER70S-6 WAAM specimens are on average around three and four times higher than S355G8+M and S355G+10M HAZ specimens, respectively. Knowing that S355G8+M and S355G+10M are widely used in the fabrication of offshore structures, which are subjected to severe cyclic loading conditions during their lifespan (Igwemezie et al 2019;Jacob et al 2019;Jacob and Mehmanparast 2021), the comparison of results in Fig. 7 shows that the WAAM technology can be potentially employed in the fabrication of less critical components and parts of offshore structures using low carbon steel wires, though the fatigue crack growth rates are expected to be higher than the S355 weldments but still lower than the recommended FCG trends provided in the BS7910 standard.…”

Section: Da/d N = C K Mmentioning

confidence: 99%

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

et al. 2021

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The new emerging Wire and Arc Additive Manufacturing (WAAM) technology has significant potential to improve material design and efficiency for structural components as well as reducing manufacturing costs. Due to repeated and periodic melting, solidification and reheating of the layers, the WAAM deposition technique results in some elastic, plastic and viscous deformations that can affect material degradation and crack propagation behaviour in additively manufactured components. Therefore, it is crucial to characterise the cracking behaviour in WAAM built components for structural design and integrity assessment purposes. In this work, fatigue crack growth tests have been conducted on compact tension specimens extracted from ER70S-6 steel WAAM built components. The crack propagation behaviour of the specimens extracted with different orientations (i.e. horizontal and vertical with respect to the deposition direction) has been characterised under two different cyclic load levels. The obtained fatigue crack growth rate data have been correlated with the linear elastic fracture mechanics parameter $$\varDelta K$$ Δ K and the results are compared with the literature data available for corresponding wrought structural steels and the recommended fatigue crack growth trends in the BS7910 standard. The obtained results have been found to fall below the recommended trends in the BS7910 standard and above the data points obtained from S355 wrought material. The obtained fatigue growth trends and Paris law constants from this study contribute to the overall understanding of the design requirements for the new optimised functionally graded structures fabricated using the WAAM technique.

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Experimental and numerical investigation of residual stress effects on fatigue crack growth behaviour of S355 steel weldments

Cited by 48 publications

References 23 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

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

Fatigue crack growth behaviour of wire and arc additively manufactured ER70S-6 low carbon steel components

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