Study on Static and Dynamic Contact Strength of Ceramic Bearing Ball

Takahashi, Manabu; Kajikawa, Shinya; Matsuda, Shinya; Ogi, Keiji; Okabe, Nagatoshi

doi:10.2472/jsms.58.338

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…The bending strength r b , given in Table 1, was determined from a three-point bending test performed on the Si 3 N 4 , which adopted the standard method specified in Japanese Industrial Standard (JIS) R 1601 [for specimens with a rectangular cross section (4 mm 9 3 mm 9 40 mm)]. In addition, the grain size shown for the ceramic ball was calculated from the results of a contact strength analysis [31] because the size cannot be measured.…”

Section: Experimental Procedures Ceramic Ballsmentioning

confidence: 99%

Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock

Matsuda

2016

J Mater Sci

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The aim of this study was to clarify the fracture characteristics of ceramic balls, as used in bearings, when subjected to thermal shock. First, water-quench tests were performed on ceramic balls of a range of sizes. The fracture morphology and fracture surface were then observed. The crack propagation and branching behaviors were observed on the surfaces of the ceramic balls after they had been subjected to thermal shock. Manufacturing flaws were then observed on the surface of the fractures in the ruptured ceramic balls. Next, the relationship between the fracture strength, as calculated using a FEM analysis of the temperature difference at thermal shock fracture initiation and the equivalent crack length calculated from the manufacturing flaw size, was theoretically discussed to introduce a virtual crack model. As a result, it was concluded that the relationship can be estimated by applying a virtual crack model based on experimental data obtained from fracture strength tests for the difference fracture type, i.e., the temperature difference depends on the size of the manufacturing flaw. Finally, the temperature difference scatter was theoretically discussed based on the results of the two-parameter Weibull distribution in conjunction with a virtual crack model.

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Section: Experimental Procedures Ceramic Ballsmentioning

confidence: 99%