A new test to determine the tensile strength of brittle balls—The notched ball test

Supancic, Peter; Dänzer, Robert; Witschnig, Stefan; Polaczek, Erich; Morrell, R.

doi:10.1016/j.jeurceramsoc.2009.02.018

Cited by 20 publications

(1 citation statement)

References 15 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies have addressed the issue of strength and ring crack initiation [2][3][4], crushing [5,6], and the tensile fracture of a notched ceramic ball [7] under quasi-static loading, as well as the rolling contact fatigue strength properties [8][9][10][11][12][13][14][15][16][17][18][19] at room and high temperatures. On the other hand, many studies have addressed the fracture behavior, fracture strength properties, and the evaluation of monolithic ceramics subjected to thermal shock [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock

Matsuda

2016

J Mater Sci

View full text Add to dashboard Cite

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.

show abstract