Load sequence effects in fatigue crack growth of thick-walled welded C–Mn steel members

Maljaars, Johan; Pijpers, R.J.M.; Slot, Henk

doi:10.1016/j.ijfatigue.2015.04.021

Cited by 22 publications

(9 citation statements)

References 45 publications

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“…Great crack growth retardation signifies long sample life. Other research suggested that the level and sequence of the load cycles can cause retardation or acceleration of crack growth, which can influence the fatigue life [ 59 ]. The retardation of crack growth is related to the changes in the size of plastic zone at the crack tip [ 60 , 61 , 62 ].…”

Section: Resultsmentioning

confidence: 99%

Prediction of Fatigue Crack Growth Rate Based on Entropy Generation

Idris

Abdullah

Thamburaja

et al. 2019

Entropy

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This paper presents the assessment of fatigue crack growth rate for dual-phase steel under spectrum loading based on entropy generation. According to the second law of thermodynamics, fatigue crack growth is related to entropy gain because of its irreversibility. In this work, the temperature evolution and crack length were simultaneously measured during fatigue crack growth tests until failure to ensure the validity of the assessment. Results indicated a significant correlation between fatigue crack growth rate and entropy. This relationship is the basis in developing a model that can determine the characteristics of fatigue crack growth rates, particularly under spectrum loading. Predictive results showed that the proposed model can accurately predict the fatigue crack growth rate under spectrum loading in all cases. The root mean square error in all cases is 10−7 m/cycle. In conclusion, entropy generation can accurately predict the fatigue crack growth rate of dual-phase steels under spectrum loading.

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Section: Resultsmentioning

confidence: 99%

Prediction of Fatigue Crack Growth Rate Based on Entropy Generation

Idris

Abdullah

Thamburaja

et al. 2019

Entropy

View full text Add to dashboard Cite

show abstract

“…Toribio et al (2015) elucidates the retardation or acceleration effect with regard to FCG being closely related to VA loading sequences which depending of the combination of load parameters, geometry of specimen, material properties and environment. Overloads are generally retarding a crack growth, while underloads are known to accelerate a crack growth (Huang et al 2008 andMaljaars et al 2015). However, as reported by Benachour et al (2013) the degree of retardation was primarily associated with range of stress intensity factor (SIF), a number of large and small amplitude and the number of cycles continued instantly after the last peak stress is applied.…”

Section: Latin American Journal Of Solids and Structures 14 (2017) 20mentioning

confidence: 95%

“…The participation of the load sequencing or load interaction effects under VA loading affect the rate of fatigue crack growth (FCG) and complicate the lives prediction. Maljaars et al (2015) estimated the crack growth rates of thick-walled C-Mn steel with welded attachment. The fatigue life was effectively enlarge by a sequence of overload.…”

Section: Latin American Journal Of Solids and Structures 14 (2017) 20mentioning

confidence: 99%

Discerning the Fatigue Crack Growth Behavior of API X65 Steels Under Sequence Loading

Mansor

Abdullah

Ariffin

2017

Lat. Am. j. solids struct.

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This paper presents the effect of sequence loading on fatigue crack growth of API X65 steel tested in room temperature. Most of pipeline steels are subjected to wide spectrum of loading during the length of service. Influence of load history effect can cause a trickier assessment to the fatigue behaviour. The objective of this study is to determine the fatigue crack growth behaviour under sequence loading. The material used in this study is X65 steel grade, broadly used in transporting the oil and gas. The constant amplitude loading under mode-I loading and stress ratio of 0.1 and 0.7 are investigate. The effects of sequence load are presents by the two-level block loading. The retardation effect is more intense for block sequence loading. At least about 9.7x10 4 delayed numbers of cycles was observed which is two times longer compared to constant amplitude loading. The load sequence was suggested affected by retardation consequently delayed the crack growth. It was further observed an increase of overload load ratio consequently resulted a crack grows faster about 18%. It was concluded a lengthy in crack growth was associated with the delay cycles suggesting that the fatigue life depends mainly on size of delay zone and compressive residual stress near the crack tip.

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“…Finally, Márquez-Domínguez & Sørensen [18] calibrate fatigue design factors of support structures with a fracture mechanics model. To the knowledge of the authors, there is no published work that addresses the effect of the sequence of loading and weather seasonality on fatigue crack growth for offshore wind jackets, although studies on other applications have shown that subsequent load peaks might cause acceleration and retardation of crack growth [19][20][21][22]. Additionally, there is a need to critically assess the difficulties of a fracture mechanics model for OWT jackets concerning lifetime prediction: what are suitable parameterization approaches, and how sensitive are crack growth results to changes in the model parameters?…”

Section: State Of the Artmentioning

confidence: 99%

Comparing a Fracture Mechanics Model to the SN-Curve Approach for Jacket-Supported Offshore Wind Turbines: Challenges and Opportunities for Lifetime Prediction

Ziegler

Muskulus

2016

Volume 6: Ocean Space Utilization; Ocean Renewable Energy

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Accurate lifetime predictions are needed for support structures of offshore wind turbines to optimize operation and maintenance and to decide about lifetime extension of aging wind farms. A comparison of a facture mechanics model to the SN-curve approach for jacket supported offshore wind turbines shows that it is attractive for lifetime extension decisions; however major challenges are calibration of material parameters and assumptions for initial crack size. Crack growths on a Y-joint connecting brace and jacket leg was analysed with simulations of structural response to aero- and hydrodynamic loading and Paris’ law for crack propagation. The model was calibrated to yield an identical fatigue life as obtained from the SN-curve analysis. The effect of weather seasonality on crack growth was evaluated with a Markov weather model and Monte Carlo simulations. Results show that crack growth is sensitive to parameter calibration and follows seasonal weather trends.

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Load sequence effects in fatigue crack growth of thick-walled welded C–Mn steel members

Cited by 22 publications

References 45 publications

Prediction of Fatigue Crack Growth Rate Based on Entropy Generation

Prediction of Fatigue Crack Growth Rate Based on Entropy Generation

Discerning the Fatigue Crack Growth Behavior of API X65 Steels Under Sequence Loading

Comparing a Fracture Mechanics Model to the SN-Curve Approach for Jacket-Supported Offshore Wind Turbines: Challenges and Opportunities for Lifetime Prediction

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