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Failure mode mapping for rolling/sliding contacts under low lambda conditions

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Abstract Tribological failures come in different forms, and there are many parameters (e.g. speed, pressure, sliding, roughness, viscosity, etc.) that affect which failure mode will be realized in testing. It… Click to show full abstract

Abstract Tribological failures come in different forms, and there are many parameters (e.g. speed, pressure, sliding, roughness, viscosity, etc.) that affect which failure mode will be realized in testing. It is not uncommon to have two apparently identical tests produce different failure modes. In this study, the failure modes of pitting, micropitting, and abrasive wear were evaluated for rolling/sliding contacts and mapped at low lambda conditions (λ (1) increasing film thickness, and thus reducing asperity contact, does not necessarily reduce the likelihood of micropitting in low lambda conditions, and (2) when the lambda ratio is less than 0.1, there exists a sensitivity where one cannot predict the resultant failure mode, most likely due to competing failure modes between abrasive wear and pitting. Additionally, some recommendations will be discussed for replicating gear tests with a disc test stand.

Keywords: low lambda; failure; rolling sliding; failure mode; lambda conditions

Journal Title: Wear
Year Published: 2021

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