Fatigue limit assessment for defective materials based on affected depth

Nasr, Anouar; Wannes, Hassine; Bouraoui, Chokri

doi:10.1051/metal/2017045

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…In previous investigations, Nasr et al [13] showed that the AD parameter was independent of the defect shape. Therefore, for the elliptical void and the notched void, we keep the same a w parameter corresponding to the spherical defect determined later.…”

Section: Fatigue Limit Calculation Based On Three Hcf Criteriamentioning

confidence: 93%

“…The AD approach was developed by Nasr et al [13] for materials containing surface defects and subjected to periodic loadings. This approach calculated the fatigue limit of defective materials by using the HCF criteria.…”

Section: Affected Depth Approach (Background)mentioning

confidence: 99%

“…The main focus of our work is to propose a comparative study of fatigue assessment of defective material based on AD suggested by Nasr et al [13]. The FE calculations are performed for C35 steel with spherical, elliptical, and circumferential defects for diverse sizes and different loadings which lead to determining the equivalent stress for three fatigue criteria near the defect.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of fatigue assessment of defective material based on affected depth

Youssef¹,

Nasr²

2022

Comptes Rendus. Mécanique

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In this work, we propose a comparative study of fatigue assessment of artificial surface defects based on affected depth (AD). The defect is assumed to be a void (semi-spherical, elliptical, or circumferential notches) on the surface of a material subjected to fatigue loading.An elastic-plastic model of Chaboche is implanted in Abaqus to simulate the cyclic Finite Element (FE) calculations.The AD model is exploited with Crossland, Dang Van, and Papadopoulos fatigue criteria to determine Kitagawa diagrams. The experimental data of the defective material C35 steel are used for model validation and comparison. The proposed comparative study of fatigue assessment provides interesting results.

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Section: Fatigue Limit Calculation Based On Three Hcf Criteriamentioning

confidence: 93%

Section: Affected Depth Approach (Background)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative study of fatigue assessment of defective material based on affected depth

Youssef¹,

Nasr²

2022

Comptes Rendus. Mécanique

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“…Depending on their size, these imperfections contribute to the degradation of the mechanical properties of the material and they are often at the origin of its failure. [6][7][8][9] Sizing of these components is often done under ideal conditions and in particular for perfect surface conditions.…”

Section: Introductionmentioning

confidence: 99%

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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