Acceleration effect of a graphite dust environment on the fatigue crack propagation rates of Al alloy

Chen, Y.Q.; Zhang, H.; Song, Wencheng; Pan, Suping; Liu, W.H.; Liu, X.; Zhu, Biwu; Song, Yufeng; Zhou, Wu‐Xing

doi:10.1016/j.ijfatigue.2019.04.033

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…A previous study showed that as for steel, fatigue life is longer in vacuum condition than in air and that the fracture surface is rougher in air [ 17 ]. In addition, it was found that an air environment can accelerate crack propagation but does not change the fracture mode [ 18 , 19 , 20 , 21 ]. Fracture morphologies vary greatly in air and vacuum condition and in a vacuum-loading environment, the fatigue crack propagation rate could be retarded significantly [ 22 , 23 , 24 ].…”

Section: Discussionmentioning

confidence: 99%

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

et al. 2022

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As nickel-based alloys are more and more widely used in engineering fields for bearing cyclic loadings, it is necessary to study their very-high-cycle fatigue (VHCF) properties. In this paper, the fatigue properties of nickel-based alloy 625 were investigated using an ultrasonic fatigue test apparatus. The fracture microscopy shows that around the crack initiation site there are two characteristic zones, a rough area (RA) and a fine granular area (FGA). Inclusions caused the interior fatigue crack initiation, and the coalescence of neighboring micro cracks was strongly influenced by the local microstructure, resulting in the RA morphology. Subsequently, the contact and compressing of the crack surfaces contributed to the formation of the FGA. Finally, the stress intensity factors of the RA and FGA were quantitatively evaluated for further discussion of the crack initiation and propagation processes.

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Section: Discussionmentioning

confidence: 99%

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

et al. 2022

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“…The rate of crack growth da/dN is commonly used to indicate the crack growth performance of metal materials. Herein, the fatigue life prediction of the 5083/6005A was made based on Paris law [27] as given by:…”

Section: Prediction Model Of Fatigue Life After Corrosionmentioning

confidence: 99%

Corrosion Mechanism and the Effect of Corrosion Time on Mechanical Behavior of 5083/6005A Welded Joints in a NaCl and NaHSO3 Mixed Solution

Chen

Wang³

et al. 2022

Crystals

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The effect of corrosion time on the mechanical behavior of 5083/6005A welded joints in a 3.5% NaCl + 0.01 mol/L NaHSO3 solution was evaluated via scanning electron microscopy (SEM), polarization curve analysis, and X-ray photoelectron spectroscopy (XPS). The prediction model of fatigue life after corrosion was established based on the experimental results and the theory of fracture mechanics, and the formula for the effect of corrosion time on lifespan was determined. The results show that with increasing corrosion time, the corrosion of the sample becomes increasingly severe, and the elongation and fatigue life of the 5083/6005A welded joints decrease significantly. The corrosion resistance of the 5083/6005A welded joints decreases with increasing corrosion time because the corrosive medium promotes the destruction of the oxide film and thereby reduces the corrosion resistance. The corrosion products of the 5083/6005A welded joints are Al(OH)3 and AlCl3.

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“…In some cases, the temperature of some certain special vehicles reaches more than 200°C, 5 and the temperature of some aerospace engines reaches more than 1000°C, 6 the working condition of high temperature requires better thermal shock resistance, better friction properties, and heat dissipation of rolling bearings. 7 In recent years, scholars have conducted in-depth research on the properties of various materials, [8][9][10] Engineering ceramics such as zirconia and silicon nitride are used to be made full ceramic ball bearings, and exhibit excellent thermal shock resistance in wide temperature ranges. Therefore, there is a great applied prospect under the working conditions of a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the misalignment of full ceramic ball bearing rotor system caused by varying gap in wide temperature ranges

Bai

Zheng

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The temperature-varying gap between the full ceramic ball bearings and the steel pedestal in wide temperature ranges leads to misalignment of the bearing rotor system, and there is a significant impact on the vibration of the rotor system. In this paper, the dynamic model considering the temperature-varying gap and time-varying contact between the full ceramic ball bearing and the steel pedestal in wide temperature ranges is proposed. The rigid body elements and the inner rings are coupled in the model, and the influence of the temperature-varying gap is analyzed. Results show that the increased gap at high temperatures brings about the looseness of the full ceramic ball bearing, the misalignment occurs between the axes of the two full ceramic ball bearings due to the looseness. The interaction between the full ceramic ball bearing and the steel pedestal becomes more significant, which causes the vibration of the rotor system to rise. Appropriately increase the interference between the full ceramic ball bearing and the steel pedestal helps reduce the gap at high temperature, thus avoiding the excessive vibration caused by misalignment and improving the rotation accuracy of the rotor system. The research results provide a reference basis for the use of full ceramic ball bearings in wide temperature ranges.

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Acceleration effect of a graphite dust environment on the fatigue crack propagation rates of Al alloy

Cited by 12 publications

References 33 publications

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

Corrosion Mechanism and the Effect of Corrosion Time on Mechanical Behavior of 5083/6005A Welded Joints in a NaCl and NaHSO3 Mixed Solution

Investigation on the misalignment of full ceramic ball bearing rotor system caused by varying gap in wide temperature ranges

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