Proposed modifications to the Wheeler retardation model for multiple overloading fatigue life prediction

Yuen, B. K. C.; Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬, Farid

doi:10.1016/j.ijfatigue.2005.12.007

Cited by 86 publications

(42 citation statements)

References 59 publications

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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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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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“…Table 2 contains the measured chemical composition of tested steel [32]. The high ductility of this steel is partly due to its high Mn and low C, P and S. The material used in the previous investigation [29] was 350 WT category 5 steel. This type of steel is both weldable and notch tough at low temperature, with minimum required yield strength of 350 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…In the current investigation, systematic crack growth modelling were conducted on 350 WT steel material that used by Yuen and Taheri [29] and X70 steel pipe material based on the NASGRO model. The present work aimed to improve the accuracy in predicting FCG and retardation effects including multiple overloading situations based on modelling and experimental works.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth rate of API X70 steel pipelines under spectrum loading

Beden

Abdullah

Ariffin

2012

International Journal of Pressure Vessels and Piping

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“…In this method, the effective stress intensity factor is defined to depict the retardation phenomenon. Many modifications of these two approaches have been proposed in the literatures [10,11]. Although most of the existing approaches can quantify the fatigue crack growth retardation after overload, they still offer the most potential improvements.…”

Section: Introductionmentioning

confidence: 99%

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

et al. 2018

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Abstract. Fatigue damage is one of the most important failure mechanisms in engineering components. The excited structures are usually subjected to spike loads in the fatigue weakness area during their service lives. The nonlinear loading sequence effects due to overloads are significant in the crack propagation process. In this paper, an in-situ scanning electron microscope (SEM) testing is performed to analyse the mechanisms of nonlinear fatigue crack growth affected by the load sequence. The crack tip behaviours under constant amplitude loading cycles superimposed by tensile overload were observed. The SEM experiment results reveal that the overload effects include the transient weakened area (shear bands and micro-cracks) and the relatively long-term retardation. Additionally, the observation loading sequence influence region is larger than the theoretical value. According to these SEM testing analyses, the Willenborg is modified considering the nonlinear loading sequence effects. In this approach, the damage zone concept is introduced to account for the instantaneous acceleration. Moreover, the loading sequence effect area is defined as the whole plastic zone due to overload rather than part of it. The proposed algorithm is validated by experiment data of 350WT steel and Al 2024-T351 specimens under constant loading with overloads. Good agreements are observed.

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Proposed modifications to the Wheeler retardation model for multiple overloading fatigue life prediction

Cited by 86 publications

References 59 publications

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

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

Fatigue crack growth rate of API X70 steel pipelines under spectrum loading

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

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