The Ball-on-Three-Balls strength test for discs and plates: Extending and simplifying stress evaluation

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


The Ball-on-Three-Balls-test has proven to be an accurate and easy-to-use option for strength testing. However, the maximum stress must be calculated based on Finite-Element-Analysis results. For this purpose, a fitted function was already provided. This function is based on results which were generated under the assumption of punctiform load introduction. Deviations from these conditions occur through an increase in contact-area between the loading ball and the specimen, large specimen deformations, friction, or plastic deformation of the balls. These non-linear effects are investigated by Finite-Element-Analysis for a wide range of specimens. It is shown that the maximum stress is sensitive to the area of contact between the loading ball and the specimen. Furthermore, thin specimens are subject to large deformations, which significantly decrease the maximum stress. Therefore, a revised fitted function is derived. For specimens with exceptional geometries, non-linear effects are considered with correction factors added to the new fitted function.

Seiten (von - bis)648-660
FachzeitschriftJournal of the European Ceramic Society
Frühes Online-Datum28 Sept. 2022
PublikationsstatusVeröffentlicht - Feb. 2023

Bibliographische Notiz

Funding Information:
M. Staudacher gratefully acknowledges financial support by the Austrian BMVIT and BMWFW in the project "CharAM" ( FFG 877684 ) of the COIN/IraSME program.

Publisher Copyright:
© 2022 The Authors

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