Abstract
Observations on crack interactions with bridging sites during in situ crack propagation in steel microfiber reinforced cementitious composites are presented. The loading fixture used for identifying the toughening mechanisms is briefly described. The loading fixture can be placed under an optical microscope, inside a Scanning Electron Microscope (SEM) or inside the Environmental Electron Microscope (ESEM). Controlled displacements are applied to compact tension specimens through a piezoelectric translator which is driven by a high voltage amplifier. The in situ crack propagation measurements reveal energy absorbing mechanisms in the vicinity of fiber and aggregate bridging sites which are contributing to the strength and toughness enhancement observed in these composites.
Original language | English |
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Pages (from-to) | 88-95 |
Number of pages | 8 |
Journal | Materials Science and Engineering A |
Volume | 278 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2000 Feb 15 |
Externally published | Yes |
Keywords
- Aggregate bridging
- Fiber bridging
- Friction
- Microcracking
- Microfibers
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering