Research Papers: Contact Mechanics

Prediction of Tribological Limits in Sliding Contacts: Flash Temperature Calculations in Sliding Contacts and Material Behavior

[+] Author and Article Information
Heinz Kloß

Bundesanstalt für Materialforschung
und-prüfung (BAM),
Unter den Eichen 44–46,
Berlin 12203, Germany
e-mail: heinz.kloss@bam.de

Mathias Woydt

Bundesanstalt für Materialforschung
und-prüfung (BAM),
Unter den Eichen 44–46,
Berlin 12203, Germany
e-mail: mathias.woydt@bam.de

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 7, 2015; final manuscript received February 11, 2016; published online May 17, 2016. Assoc. Editor: James R. Barber.

J. Tribol 138(3), 031403 (May 17, 2016) (11 pages) Paper No: TRIB-15-1147; doi: 10.1115/1.4033132 History: Received May 07, 2015; Revised February 11, 2016

In order to achieve greater efficiency or to meet light weight requirements, components are downsized. This, however, increases the load, e.g., Hertzian or nominal contact pressures and stresses of tribosystems. This load is expressed as pa·v-value, the product of nominal contact pressure and sliding velocity. pa·v-values are an effective tool for design engineers for predicting low wear/high wear transitions. Therefore, in the present work, topographical analysis has been combined with the plasticity of micro-asperities and the flash temperatures to estimate the limits of pa·v diagrams. The central piece of this set of models presented here is the calculations for flash temperatures and contact mechanics of micro-asperities. This central piece is used to predict the performance of materials in high velocity (turbines, machinery) and low velocity (human joint) applications. It is shown that the model combination suggested here is a useful tool for screening and preselecting a candidate and new materials with respect to tribological requirements before engaging in expensive testing.

Copyright © 2016 by ASME
Topics: Wear , Temperature
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Fig. 1

Comparison of flash temperature models in a normalized diagram A: Archard, TK: Tian and Kennedy, KW: Kuhlmann-Wilsdorf

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Fig. 2

Comparison of the calculated (KW), maximum flash temperature with results from literature; Brackets denote λr values, KW (1): λr = 1 and KW (40.5): λr = 40.5

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Fig. 3

Blade tip coating with abrasive SiC particles

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Fig. 4

Flow diagram for temperature calculation

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Fig. 5

Predicted abrasive wear of different tip materials relative to ZrO2

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Fig. 6

Schematic representation of pa·v curves of tribomaterials under dry sliding [41]

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Fig. 7

Predicted pa·v diagram (It = 1.78 × 10−2 mm s−1) dot chain line: flash temperature ΔT = 500 K, dashed line: seizure

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Fig. 8

Distance of neighbor summits l and enlarged plastic contact radius c as a function of normalized contact pressure: c, l (in μm), H = 6.3 GPa

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Fig. 9

pH·v diagram of Eq. (32) for ball-disk results, ball: Al2O3, disk: Al2O3, μ = 0.5, elastic contact assumed





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