Compared Influence of a Lubricant on Mode I and Mode II Fatigue Crack Growth Kinetics in a Gear Steel

Véronique Doquet; Maël Zaid; Vincent Bonnand; Didier Pacou; Vincent Chiaruttini; Pierre Depouhon

doi:10.1111/ffe.14541

Compared Influence of a Lubricant on Mode I and Mode II Fatigue Crack Growth Kinetics in a Gear Steel

Véronique Doquet, Maël Zaid, Vincent Bonnand, Didier Pacou, Vincent Chiaruttini, Pierre Depouhon

Research output: Contribution to journal › Article › peer-review

Abstract

The influence of a helicopter gearbox lubricant on Mode I or Mode II fatigue crack growth in 16NCD13 steel was characterized through tests performed on single-edge notched tensile samples loaded in tension–compression and on cruciform samples submitted to reversed shear plus static biaxial compression, respectively. In Mode I, the lubricant reduced the growth rate at low ΔK_I and increased the threshold (Formula presented.), while in Mode II, it accelerated crack growth at low ΔK_II^effective, which was not only due to a reduction in crack face friction. The upward convective flow of lubricant carrying debris exuding from the crack, a modification in oil aspect and properties, and chemical analyses near the crack front suggest that a temperature-induced degradation of the lubricant leads to a corrosive attack of the metal, which accelerates crack growth. A tribologically transformed structure is observed along the lips of cracks grown in Mode II with normal compression in oil.

Original language	English
Pages (from-to)	1137-1150
Number of pages	14
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	48
Issue number	3
DOIs	https://doi.org/10.1111/ffe.14541
Publication status	Published - 1 Mar 2025
Externally published	Yes

Keywords

Mode I
Mode II
corrosion
fatigue crack
lubricant
tribologically transformed structure

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10.1111/ffe.14541

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@article{8ee6b51c88ef4a4ea5f89d612508571d,

title = "Compared Influence of a Lubricant on Mode I and Mode II Fatigue Crack Growth Kinetics in a Gear Steel",

abstract = "The influence of a helicopter gearbox lubricant on Mode I or Mode II fatigue crack growth in 16NCD13 steel was characterized through tests performed on single-edge notched tensile samples loaded in tension–compression and on cruciform samples submitted to reversed shear plus static biaxial compression, respectively. In Mode I, the lubricant reduced the growth rate at low ΔKI and increased the threshold (Formula presented.), while in Mode II, it accelerated crack growth at low ΔKIIeffective, which was not only due to a reduction in crack face friction. The upward convective flow of lubricant carrying debris exuding from the crack, a modification in oil aspect and properties, and chemical analyses near the crack front suggest that a temperature-induced degradation of the lubricant leads to a corrosive attack of the metal, which accelerates crack growth. A tribologically transformed structure is observed along the lips of cracks grown in Mode II with normal compression in oil.",

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author = "V{\'e}ronique Doquet and Ma{\"e}l Zaid and Vincent Bonnand and Didier Pacou and Vincent Chiaruttini and Pierre Depouhon",

note = "Publisher Copyright: {\textcopyright} 2024 John Wiley \& Sons Ltd.",

year = "2025",

month = mar,

day = "1",

doi = "10.1111/ffe.14541",

language = "English",

volume = "48",

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T1 - Compared Influence of a Lubricant on Mode I and Mode II Fatigue Crack Growth Kinetics in a Gear Steel

AU - Doquet, Véronique

AU - Zaid, Maël

AU - Bonnand, Vincent

AU - Pacou, Didier

AU - Chiaruttini, Vincent

AU - Depouhon, Pierre

PY - 2025/3/1

Y1 - 2025/3/1

N2 - The influence of a helicopter gearbox lubricant on Mode I or Mode II fatigue crack growth in 16NCD13 steel was characterized through tests performed on single-edge notched tensile samples loaded in tension–compression and on cruciform samples submitted to reversed shear plus static biaxial compression, respectively. In Mode I, the lubricant reduced the growth rate at low ΔKI and increased the threshold (Formula presented.), while in Mode II, it accelerated crack growth at low ΔKIIeffective, which was not only due to a reduction in crack face friction. The upward convective flow of lubricant carrying debris exuding from the crack, a modification in oil aspect and properties, and chemical analyses near the crack front suggest that a temperature-induced degradation of the lubricant leads to a corrosive attack of the metal, which accelerates crack growth. A tribologically transformed structure is observed along the lips of cracks grown in Mode II with normal compression in oil.

AB - The influence of a helicopter gearbox lubricant on Mode I or Mode II fatigue crack growth in 16NCD13 steel was characterized through tests performed on single-edge notched tensile samples loaded in tension–compression and on cruciform samples submitted to reversed shear plus static biaxial compression, respectively. In Mode I, the lubricant reduced the growth rate at low ΔKI and increased the threshold (Formula presented.), while in Mode II, it accelerated crack growth at low ΔKIIeffective, which was not only due to a reduction in crack face friction. The upward convective flow of lubricant carrying debris exuding from the crack, a modification in oil aspect and properties, and chemical analyses near the crack front suggest that a temperature-induced degradation of the lubricant leads to a corrosive attack of the metal, which accelerates crack growth. A tribologically transformed structure is observed along the lips of cracks grown in Mode II with normal compression in oil.

KW - Mode I

KW - Mode II

KW - corrosion

KW - fatigue crack

KW - lubricant

KW - tribologically transformed structure

U2 - 10.1111/ffe.14541

DO - 10.1111/ffe.14541

M3 - Article

AN - SCOPUS:85211584862

SN - 8756-758X

VL - 48

SP - 1137

EP - 1150

JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 3

ER -

Compared Influence of a Lubricant on Mode I and Mode II Fatigue Crack Growth Kinetics in a Gear Steel

Abstract

Keywords

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