Tribological Properties of Brass Surfaces Machined by Abrasive - Free Ultrasonic Finishing Process

Aleš, Zdeněk; Pavlů, Jindřich; Hromasová, Monika; Svobodová, Jaroslava

doi:10.21062/ujep/235.2019/a/1213-2489/mt/19/1/3

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…The smaller the size of the wear area on the cylinder, the better the lubricating properties of the oil. Equation 4 was used to calculate the elliptical surface [34].…”

Section: Analysis Of Lubrication Propertiesmentioning

confidence: 99%

Mechanical Pressing of Coconut Oil and Evaluation of Its Lubricant Properties

Mizera,

Aleš,

Herák

et al. 2023

Processes

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Vegetable oils represent an important element in protecting a sustainable environment. The pursuit of environmentally friendly solutions and the ever-increasing costs of synthetic oil production are increasing the interest in natural vegetable oils. This paper presents and discusses the possibilities of using the oils obtained from coconuts (Cocos nucifera L.) harvested in Indonesia (North Sumatra region), with three maturity levels (green, yellow, and brown), as lubricants. The specific mechanical energy for linear pressing of the green, yellow, and brown types was 22.3, 20.7, and 18.5 J·goil−1, respectively. The water content of the oils obtained from the green, yellow, and brown types was 1786, 2033, and 1902 mg H2O·g−1, respectively. The mathematical models for linear pressing were established. The sizes of the wear area for the green, yellow, and brown types were 25.7, 24.4, and 34.3 mm2, respectively. The UV–visible spectral curves of the oils, in the range of 180–320 nm, were determined. The results of the lubrication properties of the Reichert test showed that better lubrication properties were exhibited by the green and yellow types, which are comparable to the lubricating properties of engine oils. The results from the SEM images also showed a better structure of the worn surface and fewer traces of abrasive wear.

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“…The smaller the size of the wear area on the cylinder, the better the lubricating properties of the oil. Equation 4 was used to calculate the elliptical surface [34].…”

Section: Analysis Of Lubrication Propertiesmentioning

confidence: 99%

Mechanical Pressing of Coconut Oil and Evaluation of Its Lubricant Properties

Mizera,

Aleš,

Herák

et al. 2023

Processes

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Increased the fatigue resistance of grade 4 ultrafine grain titanium using non-abrasive ultrasonic finishing

Asfandiyarov¹,

Аксенов²,

Shishkunova³

2023

Ii International Scientific and Practical Conference “Technologies, Materials Science and Engineering”

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Finite element analysis of stress-strain state of the deformation zone of a UFG TI Grade 4 workpiece subjected to abrasive-free ultrasonic finishing

Asfandiyarov

Raab

Гундеров

et al. 2022

Izv.VUZ. Tsvet. Met.

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An effective approach to increasing the fatigue resistance of metal products is to create compressive residual stresses on the surface of the product using surface plastic deformation (SPD) processing. One of the effective SPD methods is the process of abrasive-free ultrasonic finishing (AFUF). Another well-known approach to improving mechanical properties including fatigue resistance is to create an ultrafinegrained (UFG) structural state in the product. This research focuses on the finite-element study of the stress-strain state of a UFG workpiece subjected to SPD by the AFUF method. Commercially pure Grade 4 titanium in the UFG state obtained by the ECAP-Conform method was chosen as a workpiece material. In the course of the study, the stress-strain state of the deformation zone was analyzed after a single indentation with subsequent unloading under the elastic-plastic scenario. The effect of the indenter oscillation amplitude and its geometry on radial residual stresses including their depth of occurrence, average normal stress and strain intensity was analyzed. It was found that as the indenter radius increases, the strain intensity (e) value decreases. The e parameter distribution has a gradient nature with a decrease in values from the surface to the center of the workpiece. An analysis of simulation results shows that radial residual stresses in the deformation zone are predominantly compressive, and, accordingly, they will increase the fatigue resistance of the finished product. It was established that as the indenter oscillation amplitude increases, the values of compressive radial residual stresses also increase. Their maximum values reach 540 MPa at an amplitude of 75 μm with the depth of these stresses up to 0.3 mm. An increase in the indenter radius, i.e. in fact the contact area, leads to an increase in the magnitude of compressive radial residual stresses with an almost linear behavior.

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Tribological Properties of Brass Surfaces Machined by Abrasive - Free Ultrasonic Finishing Process

Cited by 3 publications

References 10 publications

Mechanical Pressing of Coconut Oil and Evaluation of Its Lubricant Properties

Mechanical Pressing of Coconut Oil and Evaluation of Its Lubricant Properties

Increased the fatigue resistance of grade 4 ultrafine grain titanium using non-abrasive ultrasonic finishing

Finite element analysis of stress-strain state of the deformation zone of a UFG TI Grade 4 workpiece subjected to abrasive-free ultrasonic finishing

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