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 22 publications

(3 citation statements)

References 15 publications

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“…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

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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: Introductionmentioning

confidence: 99%

Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock

Matsuda

2016

J Mater Sci

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“…Similarly, the influence of boundary phase manipulation and the effect of grain bridging on the strength and toughness were illustrated in [3]. Understanding the nature of crack growth in ceramic materials and its relation with the resistance curve (R-curve) behaviour helps to improve the fracture resistance in ceramics [4]. However, more recently it has been noted that those mechanisms do not adequately account for the steep-rising crack growth resistance curves (R-curves) observed for some materials [5].…”

Section: Introductionmentioning

confidence: 99%

Microindentation Test Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach

Kozák

Chlup

2014

KEM

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Silicon nitride based ceramics have received considerable attention during the last decades due to their very good room and high-temperature properties. Ceramics such as silicon nitride (Si3N4) are acknowledged as first choice for modern bearing applications. The influence of grain bridging on the strength and toughness was found. The prediction of crack propagation through interface elements based on the fracture mechanics approach and cohesive zone model is investigated from amount damage models. Using cohesive models the behaviour of materials is realized by two types of elements. The former is the element for classical continuum and the latter is the connecting cohesive element. Within the standard finite element package Abaqus the new finite element has been developed; it is written via the UEL procedure. The shape of the traction separation law for experimental materials is estimated from macroscopic tests,J–Rcurve is predicted and stability of the bridging law is tested. The shape of the bridging law is verified using the microindentation test, where the maximum crack length not exceeded 150 μm. The scope of the bridging effect is verified using the standard XFEM elements implemented in Abaqus.

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“…Bearing applications lead to damage initiation and accumulation. Understanding the nature of crack growth in ceramic materials and its relation with the resistance curve (R-curve) behaviour helps to improve the fracture resistance in ceramics [4]. A rising R-curve behaviour occurs when the microstructure impedes the crack extension.…”

Section: Introductionmentioning

confidence: 99%

Crack Growth Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach

Kozák

Chlup

2013

KEM

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Specific silicon nitride based materials are considered according to certain practical requirements of process, the influence of the grain size and orientation on the bridging mechanisms was found. Crack-bridging mechanisms can provide substantial increases in toughness coupled with the strength in ceramics. The prediction of the crack propagation through interface elements based on the fracture mechanics approach and cohesive zone model is investigated and from the amount of damage models the cohesive models seem to be especially attractive for the practical applications. Using cohesive models the behaviour of materials is realized by two types of elements. The former is the element for classical continuum and the latter is the connecting cohesive element. Within the standard finite element package Abaqus a new finite element has been developed; it is written via the UEL (users element) procedure. Its shape can be very easily modified according to the experimental data for the set of ceramics and composites. The new element seems to be very stable from the numerical point a view. The shape of the traction separation law for three experimental materials is estimated from the macroscopic tests, JR curve is predicted and stability of the bridging law is tested.

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

Cited by 22 publications

References 15 publications

Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock

Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock

Microindentation Test Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach

Crack Growth Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach

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