Toughening Behavior in Natural Fiber-reinforced Earth-based Composites
| Autor: | Winston O. Soboyejo, Kabiru Mustapha, Martiale Gaetan Zebaze Kana |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Bridging (networking) Mechanical Engineering Whiskers 020101 civil engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 0201 civil engineering law.invention Stress (mechanics) Brittleness Fracture toughness Optical microscope Mechanics of Materials Whisker law General Materials Science Composite material 0210 nano-technology Natural fiber |
| Zdroj: | MRS Advances. 1:791-797 |
| ISSN: | 2059-8521 |
| Popis: | This study presents a combine experimental and analytical investigation of the toughening behavior in natural fiber-reinforced earth-based composites. A specially designed single fiber pullout apparatus was used to provide aquantitative determination of interfacial properties that are relevant to toughening brittle materials through fiber reinforcement. The parameters investigated included a specially designed high strength earth-based matrix comprising of 60% laterite, 20% clay and 20% cement. The toughening behavior of whisker-reinforced earth-based matrix is analyzed in terms of a whisker bridging zone immediately behind the crack tip and interface strength. This approach isconsistent with microscopy observations which reveal that intact bridging whiskers exist behind the crack tip as a result of debonding of the whisker-matrix interface. Debonding with constant frictional stress was obtained and this formed the basis for the analytical model considered and the underlying crack-microstructure interactions associated with Resistance-curve behavior was studied using in situ/ex situ optical microscopy to account for the bridging contribution to fracture toughness. The effect of multiple toughening mechanisms (debonding and crack bridging) was elucidated and the implications of the results are considered for potential applications in the design of robust earth-based building materials for sustainable eco-friendly homes. |
| Databáze: | OpenAIRE |
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