self-healing microcapsules’ performances of friction noise in composite materials
- Paper number
IAC-09.C2.4.7
- Author
Prof. Li Zhang, China
- Coauthor
Dr. Xiuping Dong, China
- Year
2009
- Abstract
Micro cracks are usually formed in composite components under librating or friction load. An originally new method with technology of self-healing microcapsules is put forward in this paper. In the crack’s extending process, the stress is concentrated at the crack end, where the microcapsule is designed to be located. When the stress going through the microcapsules and cause them to break, the self-healing liquid runs out to fill the crack by the capillary and it will poly-react with catalyst in the composite. As a result, the crack is healed. Dicyclpentadiene (DCPD) microcapsules coated with poly (urea-formaldehyde) as self-healing capsules are chosen and their ingredients are prepared according to our past experiments and researches. In the interest of investigating the self-healing microcapsules’ performance of friction noise in composite material, which are composed with matrix resin, reinforced material and fillers, samples with and without microcapsules are both prepared. Testing experiments for friction noise at certain temperatures, such as 373K, 423K, 473K and 523K, which is below the matrix resin disassembling point, are carried out in anechoic laboratory on XL 112 fixed-speed friction tester and the rubbing tray is made of cast iron with hardness of 180-220 HB. The revolution speed for the testing experiments is 1440 r/min. Sensor INV 9205 is used for noise signal’s collection and contrastive analysis is done by special software. Investigations indicate that the frequency of friction noise for the two kinds of samples varies from 500 to 2000 Hz. The sound pressure levels for samples with microcapsules are generally 11.85\% lower than that without microcapsules at the same temperature and the same frequency. That is because the microcapsules play the role of pores and they can absorb noises in frictions. Therefore, the application of self-healing microcapsules in friction composite materials may extend the part’s lifespan and reduce the noises in friction.
- Abstract document
- Manuscript document
(absent)