Stress and fracture surface analysis of uncoated and coated 7075-T6 specimens under the rotating bending fatigue loading

Baragetti, Sergio; Božić, Željko; Arcieri, Emanuele Vincenzo

doi:10.1016/j.engfailanal.2020.104512

Cited by 41 publications

(13 citation statements)

References 35 publications

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“…Assuming compression as the starting point, the crack opens and grows during the following traction. A new 33,34,[41][42][43] compression closes the micro crack again. This mechanism introduces the striations which can only be seen with a scanning electron microscope.…”

Section: Resultsmentioning

confidence: 99%

“…Failure surfaces of some specimens, the surfaces of the sample with DLC film are in the order of σitalicfinal: a) U1; b) T8; c) T4; d) T6; e) T1. 33 , 34 , 41–43 …”

Section: Resultsmentioning

confidence: 99%

“…Experimental results for AA7075-T6 specimens subjected to rotating bending loading 33 , 34 , 41–43 with two different possible regression models. The circles refer to the experimental results of the specimens without the DLC film, the squares refer to the samples with the film.…”

Section: Resultsmentioning

confidence: 99%

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Effects of thin hard film deposition on fatigue strength of AA7075-T6

Baragetti

Arcieri

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Thanks to their favorable strength-to-weight ratio, Aluminum-Zinc alloys are often used in high-performance industrial sectors. These alloys are characterized by poor erosion resistance, which could be increased by the deposition of thin films. For example, PVD (Physical Vapor Deposition) films can reduce wear and ensure appreciable performance in aggressive environments. This paper describes the effects of thin hard film deposition on the strength of AA7075 under cyclic loading. Uncoated samples and samples with a DLC (Diamond-Like Carbon) surface layer were tested with a rotating bending fatigue machine within the range of [Formula: see text]–[Formula: see text] cycles. Two regression models were tested to study the relationship between fatigue strength and number of cycles within the range considered. For the samples without the film, even a linear regression can be suitable. With regard to the fatigue strength of the samples with surface layer, a piecewise linear regression is suggested, although a high scatter of experimental data can be observed. Finite element (FE) modelling was used to calculate the stresses induced by bending moment. The bending stresses were added to the residual stresses induced by the film deposition. The maximum value was found beneath the sample surface. Therefore, crack nucleation is expected under the surface of samples with film. The fatigue cracks initiate at the surface in untreated samples.

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Section: Resultsmentioning

confidence: 99%

“…Failure surfaces of some specimens, the surfaces of the sample with DLC film are in the order of σitalicfinal: a) U1; b) T8; c) T4; d) T6; e) T1. 33 , 34 , 41–43 …”

Section: Resultsmentioning

confidence: 99%

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Effects of thin hard film deposition on fatigue strength of AA7075-T6

Baragetti

Arcieri

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Therefore, low temperature coatings should be preferred, particularly if deposited on light alloys, as confirmed in a study on the contribution of type of coating and deposition temperature on 7075-T6 aluminum alloy [8]. The deposition of DLC coatings has been found to globally reduce the fatigue strength of 7075-T6 aluminum alloy within the number of cycles range 200,000-10,000,000 [9][10][11][12]. Another study which testifies to the doubtful contribution of PVD coatings on fatigue strength, better RCF strength, is presented in [13], where a more uniform damage-load diagram was obtained for uncoated spur gears compared to the coated components.…”

Section: Introductionmentioning

confidence: 89%

Finite Element Analysis and Experiments for Predicting Fatigue and Rolling Contact Fatigue Behavior of Spur Gears

Baragetti

2022

Period. Polytech. Mech. Eng.

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This paper presents the Finite Element (FE) analyses carried out with the aim to predict the tooth root fatigue and Rolling Contact Fatigue (RCF) behavior of spur gears, in terms of crack propagation maximum number of cycles. The combination of different materials, i.e. steel and titanium, and surface treatments, i.e. case-hardening and application of surface layers by Physical Vapor Deposition (PVD), are investigated. The residual stresses induced by the deposition of the coating are modelled. The stress intensity is described by linear elastic relations based on the crack tip opening displacement and the crack propagation in the case-hardened spur gears is described with the help of mathematical models. Experiments are carried out to evaluate tooth damage under RCF for different treated gears. The best solutions in terms of bulk material – treatment combination among the ones investigated are identified, also highlighting innovative possibilities which can guarantee appreciable performance.

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“…Moreover, the growth of these types of films can be performed at low temperatures (~200 • C) [24]. Consequently, the range of applications is huge, including use in cutting tools (drills) [25][26][27], automotive parts (piston rings, clutch plates, pumps, injectors) [28][29][30][31], optical components (lenses) [32], oxygen barrier films for plastic bottles [33,34], sanitary equipment (faucets) and bathtub mirrors [35], decorative items, windows [36,37], electrical and electronic equipment (hard disks, integrated circuits) [38,39], and molds (injection molding) [40][41][42][43]. Due to the excellent wear resistance and low friction properties, automotive applications are growing exponentially.…”

Section: Introductionmentioning

confidence: 99%

Overview on the Antimicrobial Activity and Biocompatibility of Sputtered Carbon-Based Coatings

et al. 2021

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Due to their outstanding properties, carbon-based structures have received much attention from the scientific community. Their applications are diverse and include use in coatings on self-lubricating systems for anti-wear situations, thin films deposited on prosthetic elements, catalysis structures, or water remediation devices. From these applications, the ones that require the most careful testing and improvement are biomedical applications. The biocompatibility and antibacterial issues of medical devices remain a concern, as several prostheses still fail after several years of implantation and biofilm formation remains a real risk to the success of a device. Sputtered deposition prevents the introduction of hazardous chemical elements during the preparation of coatings, and this technique is environmentally friendly. In addition, the mechanical properties of C-based coatings are remarkable. In this paper, the latest advances in sputtering methods and biocompatibility and antibacterial action for diamond-based carbon (DLC)-based coatings are reviewed and the greater outlook is then discussed.

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Stress and fracture surface analysis of uncoated and coated 7075-T6 specimens under the rotating bending fatigue loading

Cited by 41 publications

References 35 publications

Effects of thin hard film deposition on fatigue strength of AA7075-T6

Effects of thin hard film deposition on fatigue strength of AA7075-T6

Finite Element Analysis and Experiments for Predicting Fatigue and Rolling Contact Fatigue Behavior of Spur Gears

Overview on the Antimicrobial Activity and Biocompatibility of Sputtered Carbon-Based Coatings

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