Fatigue reliability prediction of defective materials based on a useful equivalent Wöhler curve

Saggar, Maroua; Bouraoui, Chokri; Nasr, Anouar

doi:10.1007/s00170-018-1975-0

Cited by 4 publications

(3 citation statements)

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“…It should be noted that the initiation phase consists of the initiation and the propagation of small cracks. This assumption was supported by direct experimental observations made by Nasr et al 14 Recent work conducted later by Saggar et al 16 allows to create a common equivalent Wo¨hler curve for defective materials where fatigue limits are identified and updated for each number of cycles at initiation. These new findings have been investigated to further explore the behavior of this type of material under variable amplitude loading.…”

Section: Introductionmentioning

confidence: 75%

“…It seems consistent with the logic that a relative variation of this curve can have a major impact on the life spans. For that, the probabilistic approach made by Saggar et al 16 can be very useful in the sizing of the Wo¨hler curve to give a more secure prediction of the HCF behavior of the defective materials.…”

Section: Resultsmentioning

confidence: 99%

“…This technique is based on the transition from the multiaxial to the uniaxial field suggested by Saggar et al 16 Based on the Chaboche model, 20 a nonlinear fatigue damage model is considered in this attempt. The cumulative damage and the residual lifetime can be achieved, from the entire loading, through the following steps:…”

Section: Fatigue Damage Model: Formulationmentioning

confidence: 99%

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Prediction of fatigue damage accumulation of defective materials under variable amplitude loading

Saggar

Nasr

Sallem

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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The main goal of this attempt is to explore and analyze the behavior of a material containing artificial surface defect and solicited under variable amplitude cyclic loading. The observation and the follow-up of the loading history and the characterization of the damage accumulation were evaluated in the presence of an artificial surface defect. The results made it possible to highlight a strong nonlinearity of the damage accumulation. However, the absence of sequence effects encountered in a defect-free material has been found. In the perspective of developing an approach to evaluate the influence of the defects on cumulative damage under variable amplitude loading, this work consists of coupling a multiaxial fatigue criterion adapted to defective materials with a law of uniaxial damage solicited under variable amplitudes loading. A cumulative damage law has been used to analyze the validity of the proposed method. Introducing the equivalent multiaxial fatigue stress due to the presence of the defect allowed us to predict the residual lifetime of a defective material, and to find the effects of sequences usually observed for variable amplitude loading for the defect-free material. A coherent agreement is observed between the results predicted by the improved model and those obtained from the experimental investigations on specimens containing artificial surface defect subjected to purely alternating tension and torsion under increasing and decreasing load levels.

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Section: Introductionmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Fatigue Damage Model: Formulationmentioning

confidence: 99%

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