|
|||||
|
|
Fracture behaviours of in situ silica nanoparticle-filled epoxy at different temperatures |
|
| Authors: | Hui Zhang Zhong Zhang Klaus Friedrich |
| Affiliation: | a National Center for Nanoscience and Technology, 100190 Beijing, China b Department of Modern Mechanics, University of Science and Technology of China, 230027 Hefei, China c Institute for Composite Materials, University of Kaiserslautern, 67663 Kaiserslautern, Germany d nanoresins AG, 21502 Geesthacht, Germany |
| Abstract: | Fracture behaviours of nanosilica filled bisphenol-F epoxy resin were systematically investigated at ambient and higher temperatures (23 °C and 80 °C). Formed by a special sol-gel technique, the silica nanoparticles dispersed almost homogenously in the epoxy resin up to 15 vol.%. Stiffness, strength and toughness of epoxy are improved simultaneously. Moreover, enhancement on fracture toughness was much remarkable than that of stiffness. The fracture surfaces taken from different test conditions were observed for exploring the fracture mechanisms. A strong particle-matrix adhesion was found by fractography analysis. The radius of the local plastic deformation zone calculated by Irwin model was relative to the increment in fracture energy at both test temperatures. This result suggested that the local plastic deformation likely played a key role in toughening of epoxy. |
| Keywords: | Nanosilica particles Epoxy matrix Fracture toughness |
| 本文献已被 ScienceDirect 等数据库收录！ | |