On the prediction of fatigue crack retardation using Wheeler and Willenborg models

Pereira, M. V.; Darwish, Fathi Aref; Camarão, Arnaldo Freitas; Motta, S. H.

doi:10.1590/s1516-14392007000200002

Cited by 25 publications

(17 citation statements)

References 19 publications

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“…The accelerated crack was tended to vanish the beneficial effect of load sequence. It was also denoted an increase of R values showed a detrimental effect of delayed plastic zone size (Pereira et al 2007). A repeated deceleration of crack growth rates was noticed for R=0.7 similar to the finding of R=0.1 indicating repeated sequence loading had showed its merit with respond to the development of plastic zone at the crack tip.…”

Section: Constant Amplitude Loadingsupporting

confidence: 66%

“…A numbers of theories discussed on crack growth retardation and it has been explained by a mechanism of residual stresses, crack closure, blunting and sharpening of crack tip and cyclic strain hardening and softening (Benachour et al 2013 andPereira et al 2007). Most of the proposed models concerning to crack growth under VA loading were oriented to the experimental test.…”

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

confidence: 99%

“…Cleaning process was followed by soaking in acetone and rinsed with distilled water. A scribe lines were drawn on the surface parallel to the specimen axis to facilitate the monitoring crack growth during cyclic loading (Pereira et al 2007). At each 1 mm of crack growth, the accumulated number of cycles was recorded.…”

Section: Fatigue Crack Growth Testmentioning

confidence: 99%

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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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Section: Constant Amplitude Loadingsupporting

confidence: 66%

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

confidence: 99%

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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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“…As for most of the plasticity-based models describing the crack growth retardation, it is supposed that once the current plastic zone reaches the boundary of large plastic zone, the retardation phenomenon vanishes [11,21,22,23]. However, according to the experimental observations in the SEM and optical microscopy testing, both of the crack growth rate recovery location and the plastic zone restoration position are further away from the overload site than the classical solution.…”

Section: Discussionmentioning

confidence: 99%

In-situ SEM and optical microscopy testing for investigation of fatigue crack growth mechanism under overload

Zhang

Liu

2018

MATEC Web Conf.

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Abstract. In this paper, the in-situ scanning electron microscope (SEM) and optical microscopy experiments are performed to investigate the crack growth behavior under the single tensile overload. The objectives are to (i) examine the overload-induced crack growth micromechanisms, including the initial crack growth acceleration and the subsequent retardation period ; (ii) investigate the effective region of single overload on crack growth rate. The specimen is a small thin Al2024-T3 plate with an edge-crack, which is loaded and observed in the SEM chamber. The very high resolution images of the crack tip are taken under the simple variable amplitude loading. Imaging analysis is performed to quantify the crack tip deformation at any time instant. Moreover, an identical specimen subjected to the same load condition is observed under optical microscope. In this testing, fine speckling is performed to promote the accuracy of digital imaging correlation (DIC). The images around the crack tip are taken at the peak loads before, during and after the single overload. After that, the evolution of local strain distribution is obtained through DIC technique. The results show that the rapid connection between the main crack and microcracks accounts for the initial crack growth acceleration. The crack closure level can be responsible for the crack growth rate during the steady growth period. Besides that, the size of retardation area is larger than the classical solution.

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“…Miner's model of linear accumulation of crack growth is severely conservative for determination of life estimates. Very often complex loading sequences exist with different amounts of static and dynamic loads or mixed loading modes [2] due to which prediction of fatigue crack growth becomes even more difficult. This was because of ignoring the plasticity-affected zone in front of the crack-tip and in the wake of the advancing crack.…”

Section: Introductionmentioning

confidence: 99%

A simulation study on fatigue with single and block overloads

Harmain

Qureshi

2010

Trans Indian Inst Met

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An investigation into crack retardation behavior for variable magnitude single overloads and block overloads is conducted on some aluminum alloys. Plasticity zone interactions and plasticity induced crack closure has been used to obtain fatigue crack growth rates in the simulation study of this investigation. The relationship between Over Load Ratio (OLR) and retardation parameter is developed and provides an insight into nonlinear behavior of overloads on fatigue growth. Thus, the lacunae in Wheeler's model pertaining to single overload applications and block overloads are addressed from the viewpoint of dependence of retardation phenomenon on the magnitude of overload ratio. The importance of introduction of overload ratios in the governing equations is emphasized. Thorough calibrations have been performed with the experimental results from various sources in open literature and the model is capable of simulating fatigue crack growth, delay cycles due to single over load and block overloads and the fidelity of the model is established. The predictions on number of delay cycles, Fatigue Crack Growth (FCG) and Fatigue Crack Growth Rate (FCGR) of the model are representative retardation behavior and agree with the experimental data. The computational analysis of load-interaction effects on fatigue crack growth is presented. The model shows that a combined effect of plasticity and crack closure is a controlling mechanism of crack growth for single overload and block overload problems. Model development is presented in Fig. 1 and some plasticity zones are given in Fig. 2, while other results obtained are provided in Figs.3, 4, 5 and 6.

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On the prediction of fatigue crack retardation using Wheeler and Willenborg models

Cited by 25 publications

References 19 publications

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

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

In-situ SEM and optical microscopy testing for investigation of fatigue crack growth mechanism under overload

A simulation study on fatigue with single and block overloads

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