Numerical analyses of stress induced damage during a reciprocating lubricated test of fecmo sps sintered alloy

Fukumasu, Newton Kiyoshi; Boidi, G.; Seriacopi, Vanessa; Machado, Guilherme Antônio Assis; Souza, R.M.; Machado, Izabel Fernanda

doi:10.1016/j.triboint.2016.12.025

Cited by 11 publications

(14 citation statements)

References 16 publications

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“…Main results showed that high porosity decrease elastic properties and surface load support capacity, causing excessive wear and closure of local pores [114]. Surface pore collapse avoids any beneficial effect on lubrication, as previously found by Boidi and co-authors [19,22]. Furthermore, Ebner and co-authors [113] verified that close porosity could improve lubrication rather than open one (connected network of pores).…”

Section: Tribological Effect Of Surface Porosity In Pm Materialssupporting

confidence: 56%

“…3 The essential information for understanding the research was reported here, and complementarily the main results obtained has been already published elsewhere [18][19][20][21][22][23].…”

Section: Research Questionsmentioning

confidence: 66%

“…Harsh test conditions combining high contact pressure and sliding speed caused significant plastic deformation and surface pores closure in more porous surfaces (D8). Low density material did not offer enough surface load capacity when tested at high contact pressure, therefore pores could collapse, as showed in [19,22]. In this context, the E/H ratio could be used as a deformation indicator, as reported in [116].…”

Section: Before Tribological Test (A)mentioning

confidence: 95%

“…The application of an external electric field influenced the movement of crystalline defects, nucleation and crystal growth, evaporation and oxidation processes, as reported by Chen et al [30]. The SPS process is a variation of the electric field applied technique and has attracted considerable attention [19,22,[31][32][33].…”

Section: Spark Plasma Sintering (Sps) Techniquementioning

confidence: 95%

“…Besides total (volume) porosity, also pore distribution and main geometrical characteristics should be considered [15,22,23].…”

Section: Porosity and Pore Morphology Measurementsmentioning

confidence: 99%

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An experimental assessment of surface micro irregularities (porosity and texture) effects on tribological behaviour under lubricated conditions.

Boidi¹

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recent years, although this procedure usually implies extra manufacturing operations and costs. On the other hand, sintered materials contain themselves surface cavities that could potentially act as surface texture and, consequently, lead to friction reduction. This research aims to extend the current knowledge on the tribological influence of micro surface irregularities (pores and laser texture) under lubricated experimental tests and explore the use of these features for tribological applications. Samples were manufactured using both sintering and texturing processes to obtain different surface characteristics. Three different porosity conditions were produced for sintered steels, whereas grooves and dimples configurations were designed for textured steel samples. After that, experimental tests were performed under varying sliding-rolling conditions (from prevalent rolling to prevalent sliding) especially using non-conformal contact. Speed was also varied during frictional tests to cover a wide range of operational conditions and verify the effects of surface features under different lubrication regimes. Friction tests were carried out with two tribometers using configurations of pin-on-disk, roller-on-disk and ball-on-disk. Film thickness was measured by an ultra-thin optical interferometry rig using a methodology properly designed for rough samples. Samples with smooth surfaces were utilized as a reference bench to be compared to material with surface modification (texture or porosity). Main results showed that the decrease of porosity led to friction reduction in the sintered steel. Material with reduced porosity performed even better than reference smooth samples. In addition, the dimple configuration promoted friction reduction, whereas grooves generally performed similarly or worse than reference material. Even if textured dimples and small porosity on sintered material were produced by different techniques, they presented similar geometrical characteristics and consequently they both reduced friction compared to reference samples. As part of the outcome, main results were mapped to better understand the effect of each surface feature on tribological performance. Furthermore, a preliminary phenomenological model was proposed to predict frictional response of surface with micro cavities (pores or texture) from reference steel results. Main findings suggest that the effect of tailored surface cavities could be somehow compared to randomly distributed ones, even if produced by very different manufacturing techniques.

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Section: Tribological Effect Of Surface Porosity In Pm Materialssupporting

confidence: 56%

“…3 The essential information for understanding the research was reported here, and complementarily the main results obtained has been already published elsewhere [18][19][20][21][22][23].…”

Section: Research Questionsmentioning

confidence: 66%