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End Hemispherical Cavities Roller: A Comparative Evaluation of Prospects of Higher Fatigue Life

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Strength of Materials Aims and scope

Since fatigue life is the pivotal parameter in rolling element bearings, an enhancement in fatigue life has been enviable always. The flexibility of rolling elements can aid in reduction of contact stresses which eventually can increase fatigue life of rolling element bearings and that led to the hollow roller concept, however hollow roller concept encountered limitations in applications due to its catastrophic fractures at relatively lower loading conditions. Thus, the concept of end hemispherical cavities (EHC) roller, which possesses enough strength against such catastrophic failures along with probability of higher fatigue life than solid roller, has been treated further. Correspondingly, the present paper discusses the methodology for predicting fatigue life of rolling element bearings and employs the understanding of fatigue life models for comparing performance of EHC roller concept with other variants from fatigue life aspect. The simulations were performed for variants considered ensuing validation of methodology by exercising analytical results of Hertzian contact pressure. The stressed volume and the magnitude of decisive stress were emphasized to gauge performance of variants. Attained results indicated that EHC roller concept has prospects of transcending fatigue life of solid roller.

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Abbreviations

E I, E II :

– elastic moduli of the materials of contacting bodies I and II, respectively (MPa)

L :

– life of bearings, million revolutions

A :

– material constant

τ:

– failure-causing stress (MPa)

τu :

– threshold value of failure-causing stress (MPa)

c :

– stress exponent

h :

– depth exponent

e :

– Weibull slope

Z :

– depth of occurrence of maximal stress or weighted average depth (mm)

Q :

– normal force between roller and race (N)

b :

– semi-contact width of contact area (mm)

l :

– length of cylindrical rolling element (mm)

ξI, ξII :

– Poisson’s ratio for materials of contacting bodies I and II, respectively

σmax :

– maximum Hertzian contact stress (MPa)

∑ρ:

– curvature sum (mm–1)

37H:

– hollow roller with 37% hollowness

61H:

– hollow roller with 61% hollowness

CRB:

– cylindrical roller bearings

DGBB:

– deep-groove ball bearings

EHC:

– end hemispherical cavities (roller)

RCF:

– rolling contact fatigue

SVP:

– stress-volume product

SVPR:

– stress-volume product ratio

TRB:

– tapered roller bearings

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India

    P. C. Chhotani & D. P. Vakharia

Authors
  1. P. C. Chhotani
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  2. D. P. Vakharia
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Correspondence to P. C. Chhotani.

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Translated from Problemy Prochnosti, No. 3, pp. 118 – 128, May – June, 2021.

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Chhotani, P.C., Vakharia, D.P. End Hemispherical Cavities Roller: A Comparative Evaluation of Prospects of Higher Fatigue Life. Strength Mater 53, 491–501 (2021). https://doi.org/10.1007/s11223-021-00310-1

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