Application Limits of small dimensioned Sintered Journal Bearings in Grease-lubricated Planetary Gears
- Perforation and penetration mechanics research is mostly governed by experimental and numerical investigations while analytical models are less available due to the extremely complicated nature of the subject. Sufficiently thick ductile targets are perforated by rigid, nose-pointed projectiles in a ballistic process whose dominant failure mode is ductile hole enlargement. Several recent studies have shown that for perforation process by ductile hole formation, the specific cavitation energy, which reflects the target material
resistance to steady hole expansion, is essential for analytical predictions of ballistic limit velocities. The ballistic limit velocity is the minimum impact speed that is required for complete perforation of a given target by a given projectile. A logarithmic formulation for the specific cavitation energy of metal targets, which is based on the concepts of (spherical cavitation) effective yield stress and hole slenderness ratio, is shown in several recent studies to be very useful for analytical predictions ofPerforation and penetration mechanics research is mostly governed by experimental and numerical investigations while analytical models are less available due to the extremely complicated nature of the subject. Sufficiently thick ductile targets are perforated by rigid, nose-pointed projectiles in a ballistic process whose dominant failure mode is ductile hole enlargement. Several recent studies have shown that for perforation process by ductile hole formation, the specific cavitation energy, which reflects the target material
resistance to steady hole expansion, is essential for analytical predictions of ballistic limit velocities. The ballistic limit velocity is the minimum impact speed that is required for complete perforation of a given target by a given projectile. A logarithmic formulation for the specific cavitation energy of metal targets, which is based on the concepts of (spherical cavitation) effective yield stress and hole slenderness ratio, is shown in several recent studies to be very useful for analytical predictions of ballistic limit velocities. The logarithmic
formulation for the specific cavitation energy is presented, and the concepts of cavitation effective yield stress and hole slenderness ratio are reviewed and discussed regarding their importance for accurate analytical predictions of ballistic limit velocities. The present article is a review of these two concepts and their usefulness in perforation mechanics.…


| Author: | Luis Huber, Alexander MonzORCiD |
|---|---|
| DOI: | https://doi.org/10.11159/icmie23.131 |
| ISSN: | 2369-8136 |
| Parent Title (English): | World Congress on Mechanical, Chemical, and Material Engineering |
| Publisher: | Avestia Publishing |
| Place of publication: | Ottawa |
| Document Type: | conference proceeding (article) |
| Language: | English |
| Reviewed: | Begutachtet/Reviewed |
| Release Date: | 2025/02/18 |
| Tag: | Grease; Journal Bearings; Lubrication |
| Volume: | 9 |
| Article Number: | ICMIE 131 |
| Pagenumber: | 8 |
| First Page: | 1311 |
| Last Page: | 1318 |
| Konferenzangabe: | Proceedings of the 9 th World Congress on Mechanical, Chemical, and Material Engineering (MCM'23) Brunel University, London, United Kingdom - August 06-08, 2023 |
| institutes: | Fakultät Maschinenbau und Versorgungstechnik |
| Institut für Chemie, Material- und Produktentwicklung | |
| Research Themes: | Materialien & Produktionstechnik |
