Metallic materials fatigue behavior: Scale levels and ranges of transition between them

Shanyavskiy, Andrey; Soldatenkov, A. P.

doi:10.1016/j.ijfatigue.2022.106773

Cited by 11 publications

(9 citation statements)

References 31 publications

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“…It is related to the fact that in this range of life, the fatigue cracks originate by the mechanism which is different as compared with the mechanism of crack initiation at the lower durability range. Moreover, as performed analysis had shown the part of cracks was initiated from raceway surface, and it corresponds to the fact that in the transitional region from VHCF to HCF, two modes of crack origination belonging to two different fracture mechanisms (surface and subsurface) may be observed simultaneously 40,41 …”

Section: Discussionmentioning

confidence: 95%

“…Moreover, as performed analysis had shown the part of cracks was initiated from raceway surface, and it corresponds to the fact that in the transitional region from VHCF to HCF, two modes of crack origination belonging to two different fracture mechanisms (surface and subsurface) may be observed simultaneously. 40,41 Therefore, it is obvious that fatigue curves for bearings with regard to the durability range up to 10 8 cycles plotted by results of bench tests do not allow to predict the bearing durability greater than 10 9 cycles, where material behavior at the crack initiation is different and necessary to be investigated.…”

Section: Discussionmentioning

confidence: 99%

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Crack path and regularities for ball‐bearing fracture in the very‐high‐cycle fatigue regime

Shanyavskiy

Soldatenkov²

2022

Fatigue Fract Eng Mat Struct

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The process of fatigue spalling in the rings of ball bearings at durability exceeding 10 8 cycles under in-service loading conditions is analyzed on the basis of fractography and the slices prepared in radial planes of rings. The cracks are shown to originate at subsurface from carbides inherent in the bearing steel or inclusions permissible by sizes for the material. Subsequently, the development of cracks perpendicular to the ring raceway surface takes place similarly as in the very-high-cycle fatigue (VHCF) regime with the elliptical "fish-eye" formation. The subsequent crack growth was demonstrated step-by-step up to the ring material fragment separation. The total crack path by alternating stops of propagation and new crack nucleation under conditions of mixedmode I + II + III mechanisms with the crack branching was discussed. In the final stage, the crack grows towards the ring raceway and either appears on the raceway surface or coalesces with a similar adjacent crack followed by fatigue spalling formation.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Crack path and regularities for ball‐bearing fracture in the very‐high‐cycle fatigue regime

Shanyavskiy

Soldatenkov²

2022

Fatigue Fract Eng Mat Struct

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“…This transition between domains extends within a certain range of stress of the material. Within this range of stress, the probability of fracture in the HCF domain decreases as the applied load decreases [ 37 ]. Moreover, microstructural heterogeneities and a wide distribution of defects, such as coarse carbides and inclusions, may raise the scatter of fatigue results within the transition between HCF and VHCF domains [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

An Experimental Analysis of the High-Cycle Fatigue Fracture of H13 Hot Forging Tool Steels

et al. 2022

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In this study, the axial fatigue behaviour of hot forging tool steels at room temperature was investigated. Fatigue tests were performed on two steels within the same H13 specification. The fatigue tests were carried out in the high-cycle fatigue domain under normal conditions. These tests were also performed on specimens in contact with a corrosive medium, applying stress values that led to the high-cycle fatigue domain under normal conditions for the sake of comparison. Both materials showed similar fatigue strengths when they were tested under normal conditions. In contrast, corrosion fatigue lives were much lower than in normal tests and differed significantly between the two steels. Crack initiation was triggered by microstructural and surface defects in the normal tests, whereas the formation of corrosion pits caused crack initiation in the corrosion fatigue tests. Moreover, a fracture surface analysis revealed dissimilar crack propagation areas between both steels, which suggested that both steels had different fracture toughness. These results were in line with the differences observed between the carbide and grain sizes of both of the material microstructures.

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“…Moreover, as performed analysis had shown the part of cracks were initiated from raceway surface, and it corresponds to the fact that in the transitional region from VHCF to HCF, two modes of crack origination belonging to two different fracture mechanisms (surface and subsurface) may be observed simultaneously. 39,40 Therefore, it is obvious that fatigue curves for bearings with regard to the durability range up to 10 8 cycles plotted on results of bench tests do not allow to predict the bearing durability greater than 10 9 cycles, where material behavior at the crack initiation is different and necessary to be investigated.…”

Section: Discussionmentioning

confidence: 99%

Crack path and regularities for ball-bearing fracture in the very high cycle fatigue regime

Shanyavskiy¹,

Soldatenkov²

2022

Preprint

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The process of fatigue spalling in the rings of ball bearings at durability exceeding 10 cycles under in-service loading conditions is analyzed on the basis of fractography and the slices prepared in radial planes of rings. The cracks are shown to originate at subsurface from carbides inherent in the bearing steel or inclusions permissible by sizes for the material. Subsequently, the development of cracks perpendicular to the ring raceway surface takes place similarly as in the VHCF regime with the elliptical “fish-eye” formation. The subsequent crack growth was demonstrated step-by-step up to the ring material fragment separation. The total crack path by alternating stops of propagation and new crack nucleation under conditions of mixed-mode I+II+III mechanisms with the crack branching was discussed. In the final stage, the crack grows towards the ring raceway and either appears on the raceway surface or coalesce with a similar adjacent crack followed by fatigue spalling formation.

show abstract

Metallic materials fatigue behavior: Scale levels and ranges of transition between them

Cited by 11 publications

References 31 publications

Crack path and regularities for ball‐bearing fracture in the very‐high‐cycle fatigue regime

Crack path and regularities for ball‐bearing fracture in the very‐high‐cycle fatigue regime

An Experimental Analysis of the High-Cycle Fatigue Fracture of H13 Hot Forging Tool Steels

Crack path and regularities for ball-bearing fracture in the very high cycle fatigue regime

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