Effect of Component Differential Hardnesses on Residual Stress and Rolling-contact Fatigue PDF Download
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Author: Erwin V. Zaretsky
Publisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 18
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Book Description
Residual stress measurements were made in the zone of resolved shearing stress on five SAE 52100 upper test ball specimens with an average Rockwell C hardness of 63.2. These upper test ball specimens were run against lower test balls of nominal Rockwell C hardnesses of 60, 62, 63, 65, and 66 until either ft conditions included an or both components failed because of fatigue. Test conditions included an average race temperature of 150 F, a maximum (Hertz) compressive stress of 800,000 psi, and a highly purified naphthenic mineral oil lubricant. Fatigue lives of the upper test balls were compared with measured residual stresses in the subsurface zone of resolved shearing stress. The compressive residual stress induced in the upper test ball during running is a function of delta H, the hardness of the lower test balls minus the upper test ball hardness An interrelation is indicated among differences in com- ponent hardness, induced compressive residual stress, and fatigue life. Measured values of compressive residual stress within the zone of resolved maximum shearing stress ranged from 178,000 and 294,000 psi. The apparent maximum residual stress occurs above where delta H = 0.
Author: Erwin V. Zaretsky
Publisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 18
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Book Description
Residual stress measurements were made in the zone of resolved shearing stress on five SAE 52100 upper test ball specimens with an average Rockwell C hardness of 63.2. These upper test ball specimens were run against lower test balls of nominal Rockwell C hardnesses of 60, 62, 63, 65, and 66 until either ft conditions included an or both components failed because of fatigue. Test conditions included an average race temperature of 150 F, a maximum (Hertz) compressive stress of 800,000 psi, and a highly purified naphthenic mineral oil lubricant. Fatigue lives of the upper test balls were compared with measured residual stresses in the subsurface zone of resolved shearing stress. The compressive residual stress induced in the upper test ball during running is a function of delta H, the hardness of the lower test balls minus the upper test ball hardness An interrelation is indicated among differences in com- ponent hardness, induced compressive residual stress, and fatigue life. Measured values of compressive residual stress within the zone of resolved maximum shearing stress ranged from 178,000 and 294,000 psi. The apparent maximum residual stress occurs above where delta H = 0.
Author: David W. Reichard
Publisher:
ISBN:
Category : Roller bearings
Languages : en
Pages : 36
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Book Description
Author: Erwin V. Zaretsky
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 26
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Book Description
Author: Pei Moo Ku
Publisher:
ISBN:
Category : Lubrication and lubricants
Languages : en
Pages : 602
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Book Description
Lubrication, wear, and design aspects of rolling contact bearings.
Author: P. M.. Ku
Publisher:
ISBN:
Category :
Languages : en
Pages : 616
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1188
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: J. J. C. Hoo
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 420
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Book Description
Author:
Publisher:
ISBN:
Category : Hardness
Languages : en
Pages : 26
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Book Description
Rolling-contact fatigue tests were performed on SAE 52100 207-size deep-groove ball bearing determine the relation between bearing fatigue life and actual bearing component hardness differences and the effect of actual component hardness differences on bearing fatigue life scatter. The 207-size bearings with inner and outer races from the same heat of SAE 52100 material and with nominal Rockwell C hardnesses of 63 were assembled with SAE 52100 balls from the same heat of material tempered to nominal Rockwell C hardnesses of 60, 63, 65, and 66. Test conditions included an inner race speed of 2750 rpm, a radial load of 1320 pounds, which produced maximum Hertz stresses of 352 000 and 336 000 psi at the inner and the outer races, respectively, and a highly purified naphthenic mineral oil as the lubricant. Subsequent to testing, the bearings were disassembled, and all component hardnesses were measured. The bearings were regrouped according to their actual values of AH for Rockwell C hardness increments of 0. 5 and 1. 0, where AH is the difference between the actual hardness of the rolling elements in the bearing and the actual hardness of the inner race. The fatigue life and scatter results were compared with component hardness combinations and data previously obtained from the five-ball fatigue tester. The following results were obtained
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 478
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Book Description
Author: J. Y. Mann
Publisher: Elsevier
ISBN: 1483189511
Category : Reference
Languages : en
Pages : 512
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Book Description
Bibliography on the Fatigue of Materials, Components and Structures, Volume 3 addresses the problems associated with fatigue loadings as evident in branches of engineering and technology. Such debilitating factor also affects the human skeletal system. The book provides several references that show an increasing focus being given to the problem of fatigue in materials, components, and structures. The journals and lists of references used in the book, which discuss the subject of fatigue, are chosen to give an initial identification of citations. These sources are accompanied by computer-based documentation systems. The bibliographical data for each citation are thoroughly reviewed by checking the original bases of publication. The references in the book are arranged chronologically according to its year of publication. Major use has been made of abbreviations for the titles of journals and publications. The book can serve as a valuable tool for doctors, therapists, students, and researchers in the field of medicine.
