| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
The Ball-on-Three-Balls-Test: Improving Accuracy and Simplifying Stress Evaluation |
| Author(s) |
Maximilian Staudacher, Tanja Lube, Peter Supancic |
| On-Site Speaker (Planned) |
Maximilian Staudacher |
| Abstract Scope |
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 (FEA) results. For this purpose, a fitted function was provided in 2002. This function is based on results which were generated under the assumption of punctiform load introduction. Deviations from these ideal conditions occur through large specimen deformations, plastic ball deformation, friction, or an increase in contact-area between the balls and the specimen. These non-linear effects are investigated by FEA 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 presented. For specimens with exceptional geometries, non-linear effects are considered with adjustment factors added to the new fit function. |