2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 7: Yang Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Aifantis E, Wang H, Zhu T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 190 pages |
| ISBN: | 978-1-987820-48-5 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Power-law singularity characteristics of damage and failure of nano-particle ceramic coating systems
Yueguang Wei1;1INSTITUTE OF MECHANICS, Beijing, China;
Type of Paper: Regular
Id Paper: 299
Topic: 1
Abstract:
Damage and failure rule of nano-particle ceramic coatings bonded on the alloy substrates are studied by observing crack evolution in the coating systems under in situ three- and four-point bending tests with corresponding load-displacement curves. A general damage and catastrophic failure model for the nano-particle ceramic coatings is proposed based on the elastic-brittle material model. Simultaneously, a mathematical model of damage and catastrophic is also used to describe the failure of the nano-particle ceramic coatings. The results indicate that the damage increases with increasing stress and obeys the power-law characteristics with the power exponent of 1/2, the damage tends to be complete as the stress reaches the failure point. The damage rate increases rapidly when the stress is near to the failure point and shows the power law singularity of -1/2. The experimental results of thin and thick coatings are all in agreement with the predictions based on the models.