Numerical investigation on the effect of thickness and stress level on fatigue crack growth in notched specimens

Gadallah, Ramy; Murakawa, Hidekazu; Ikushima, Kazuki; Shibahara, Masakazu; Tsutsumi, Sadami

doi:10.1016/j.tafmec.2021.103138

Cited by 9 publications

(1 citation statement)

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“…The used approach is based on the strain life curve, considering the stress gradient and microstructure effects, for the most severe conditions where the notch radius is in the order of 10 μm, approximate 15% fatigue life is spent in the initiation phase. Gadallah et al [7] investigated the effect of thickness and stress level on fatigue crack growth FCG behavior for mild steel in notched specimens. Their results showed that thickness has a remarkable effect on the crack growth rate at the free surface when the applied stress level is below and close to the general yield where the thinner specimens gave faster crack growth rates.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Crack Propagation Rate in Notched Specimens Using XFEM Method under Bending Load Condition

Zergot¹,

Moussaoui²,

Hachi³

2022

ACSM

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The crack initiation and propagation often occur in structures subjected to fatigue loads and their privileged sites it is the geometric discontinuity in particular the notches. The geometric configuration of the notches always leads to disturbances of stress fields in the vicinity of the notch end as a consequence of the effects on the crack initiation site and on the crack rate. The present study is interested to the evolution of crack speed propagation in the notched specimens subjected to bending. The specimens chosen are made of PMMA material containing two opposite notches U or V that presented two different parameters, a radius for U-notch and angle for V-notch. The variations taken into account for the sharp notches (V-notch) going from the small angle to the large angle, which are 30°; 45°, 90°, and 140°, and for blunt notches (U-notch) the radius takes the different values 0.5, 1, 1.5, and 2 mm. The fracture brittle behavior adapted to this material led to predict the Fatigue crack growth using a modified form of Paris’s law with the equivalent stress intensity factor (ΔKeq) relying on extended finite element method (XFEM) in order to follow the interaction between the notch and the crack on one side and study the evolution of crack growth rate to another side. The variations, which brought to these parameters entailed an influence on the crack propagation speed, which was born at the end of notch of component as well as the variations of equivalent notch intensity stress factors (ΔKeq). The variations made to the parameters of notches have a huge influence on the crack propagation rate.

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Section: Introductionmentioning

confidence: 99%