Fretting and plain fatigue behavior of Al 7075-T651 at elevated temperatures

Majzoobi, G.H.; Soori, Mohsen

doi:10.1177/1350650113495189

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Also, the load transfer during dry sliding action between the asperities of base alloy and mating steel disc was repetitive in behavior and which may lead to fretting fatigue wear mechanism. Majzoobi and Soori observed that the fretting fatigue wear occurs when the mating surfaces were subject to oscillating loads and sliding motions at the same time [32]. The asperities on the surface of base alloy sample and mating disc have undergone repetitive loading actions which lead to crack formation and propagation as shown in Figure 11.…”

Section: Wear Propertiesmentioning

confidence: 99%

Effect of SiC/Fly Ash Reinforcement on Surface Properties of Aluminum 7075 Hybrid Composites

et al. 2020

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Friction stir processing (FSP) has emerged as a valuable technique in the surface metal matrix composite fabrication field. In this process, solid-state processing mostly avoids the formation of detrimental phases inside composites. Despite having a high specific strength, further extensive Al alloy applications are limited due to their poor surface properties. A hybrid reinforcement approach can be used to improve surface properties. In this study, industrial waste fly ash material is mixed with hard SiC ceramic particles. The main focus of this research is to improve wear resistance under dry sliding conditions and microhardness of aluminum 7075-T651 by dispersion of silicon carbide-fly ash (SiC/fly ash) powder in a base alloy by FSP. The parameters used for this investigation are: tool rotation rpm (500, 1000 and 1500), the tool traverse mm/min (20, 30 and 40), the reinforcement’s hybrid ratio HR (60:40, 75:25 and 90:10) and the volume percentage vol.% (4%, 8% and 12%). The influence of these parameters on the resultant composite’s microstructure, dry sliding wear rate and micro-hardness was studied. By using response surface methodology (RSM), desirable ranges of process parameters for lower wear rate and higher microhardness were obtained. The interaction effect of SiC/fly ash volume percentage and hybrid ratio had the most influential effect on the wear rates, as well as microhardness of composites. Moreover, microhardness increased with an increase in the volume percentage of SiC/fly ash powders towards high SiC content in hybrid ratio. Interestingly, among stirring parameters, tool traverse speed was found to be more influential than tool rotational speed. The minimum wear rate was observed for the Run 20 sample (w: 1000 rpm, v: 40 mm/min, HR: 75:25, vol.%: 8). A maximum microhardness of 241.20 HV was achieved for Run 15 (w: 500 rpm, v: 40 mm/min, HR: 90:10, vol.%: 12) sample. Mainly, reinforcement distribution—in accordance with the stirring action generated by the tool—had a major role in controlling the surface properties of the resultant composites.

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Section: Wear Propertiesmentioning

confidence: 99%

Effect of SiC/Fly Ash Reinforcement on Surface Properties of Aluminum 7075 Hybrid Composites

et al. 2020

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“…Aluminum alloy materials offer a potential for widespread applications in the automotive industry because of its lightweight. [1][2][3][4][5] Several investigations have been conducted on the wear resistances of Al-Si alloy. [6][7][8] Chen et al 9 detailed the wear resistance of Al-Si alloys subjected to boundary-lubricated contact during pin-on-disk tests.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface chemical etching on the lubricated reciprocating wear of honed Al–Si alloy

Shen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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To improve the wear resistance of the honed Al-Si alloy cylinder liner, the chemical etching was applied on the surface of the Al-Si alloy samples. The effect of the etching time on the wear behaviors of the etched surface was investigated using an in-house designed reciprocating wear machine with oil lubrication. Meanwhile, the tribological properties were related to the changes in the surface morphology of the Al-Si alloy samples before and after the wear tests to analyze the associated underlying wear mechanisms. Results show that 5% NaOH solution is an effective chemical agent to etch the surface of Al-Si alloy samples. The 2 min etched Al-Si alloy samples exhibits low friction coefficient and small weight loss, indicating a good wear behavior of the properly etched surface. The insufficiently etched surface was found when the etching time was less than 2 min. Rare silicon particles are exposed due to the little removal of the aluminum on the surface, such that aluminum will be in direct contact with the piston ring during friction, causing adhesive wear. In contrast, overetching leads to the even more seriously worn out surface as observed in the samples etched for more than 3 min. The silicon particles tends to debond from the matrix with the increase of etching depth, then serve as the abrasive grains in the friction, resulting in the considerable increase of the friction coefficient and weight loss.

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“…1 Fretting fatigue is influenced by many factors such as friction, contact geometry, temperature, frequency, slip amplitude, contact pressure, etc. 2,3 Since there is no standard and globally accepted test rig for fretting fatigue experiments, researchers have to design their own rig to meet specific requirements, which in turn increase the number of test rig concepts. From the literature it is deduced that fretting fatigue test configurations can be divided into two main categories: coupon and full-scale test rigs.…”

Section: Introductionmentioning

confidence: 99%

Developing a new experimental set up to study fretting fatigue behavior under cyclic contact loading

Abbasi

Majzoobi

Barjesteh³

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The disk slot and blade attachment in the gas turbine engines are operated under both cyclic axial and contact loads simultaneously. In this investigation, a new coupon scale testing apparatus is designed and manufactured to study the fretting fatigue behavior of materials under cyclic contact loads. In this cyclic contact load fretting fatigue device (CCLFFD), a simple synchronized electro-mechanical system is used for generating cyclic contact loads with frequency of 0-200 Hz and magnitude of 0-10 kN. The CCLFFD is well instrumented for adjusting, measuring and online monitoring the contact load frequency, contact load graph, and rotation speed of the servomotors. Repeatability and reliability of the test rig were examined by experiment. The performance of the CCLFFD was verified using the experimental results reported in the literature and also by conducting a number of fretting fatigue tests on Al7075-T6 at different contact load frequencies in this work. The results showed that fretting fatigue was significantly affected by the contact load frequency particularly for high cycle fatigue regime. However, the effect was less important for low cycle fatigue regime and totally insignificant for frequencies higher than 80 Hz.

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Fretting and plain fatigue behavior of Al 7075-T651 at elevated temperatures

Cited by 7 publications

References 21 publications

Effect of SiC/Fly Ash Reinforcement on Surface Properties of Aluminum 7075 Hybrid Composites

Effect of SiC/Fly Ash Reinforcement on Surface Properties of Aluminum 7075 Hybrid Composites

Effect of surface chemical etching on the lubricated reciprocating wear of honed Al–Si alloy

Developing a new experimental set up to study fretting fatigue behavior under cyclic contact loading

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