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Strengthening and toughening mechanisms in microfiber reinforced cementitious composites
Materials with quasi-brittle stress strain curves exhibit desirable properties such as enhanced durability, flaw tolerance and toughness. This study reveals that steel microfiber reinforced cement based composites exhibit such quasi-brittle behavior. Mechanical properties of steel microfiber reinforced cement based composites are obtained through flexure and splitting tension tests. The cracking process and crack fiber interactions that lead to the quasi-brittle behavior in these composites were investigated. The strength and toughness enhancement is associated with crack wake mechanisms. Aggregate bridging and pullout and secondary crack formations associated with microfiber bridging sites are predominant during the strain hardening regime. Multiple secondary microcracks perpendicular to the fiber/matrix interface is the dominant failure mode beyond peak load in the strain softening regime.
Strengthening and toughening mechanisms in microfiber reinforced cementitious composites
Materials with quasi-brittle stress strain curves exhibit desirable properties such as enhanced durability, flaw tolerance and toughness. This study reveals that steel microfiber reinforced cement based composites exhibit such quasi-brittle behavior. Mechanical properties of steel microfiber reinforced cement based composites are obtained through flexure and splitting tension tests. The cracking process and crack fiber interactions that lead to the quasi-brittle behavior in these composites were investigated. The strength and toughness enhancement is associated with crack wake mechanisms. Aggregate bridging and pullout and secondary crack formations associated with microfiber bridging sites are predominant during the strain hardening regime. Multiple secondary microcracks perpendicular to the fiber/matrix interface is the dominant failure mode beyond peak load in the strain softening regime.
Strengthening and toughening mechanisms in microfiber reinforced cementitious composites
Verstärkungs- und Vorspannungsmechanismus in mikrofaserverstärkten Verbundwerkstoffen auf Zementbasis
Yi, C. (author) / Ostertag, C.P. (author)
Journal of Materials Science ; 36 ; 1513-1522
2001
10 Seiten, 9 Bilder, 3 Tabellen, 18 Quellen
Article (Journal)
English
mechanische Verstärkung , Faserverstärkung , faserverstärkter Werkstoff , faserverstärkter Zement , Stahlfaser , stahlfaserverstärkter Beton , Vorspannen , Zugbeanspruchung , Spannungs-Dehnungs-Diagramm , Spannungs-Dehnungs-Verhalten , Rissaufweitung , COD (Crack Opening Displacement) , Rissausbreitung , bruchmechanische Prüfung , Risswiderstand , Bruchmechanik
Strengthening and toughening mechanisms in microfiber reinforced cementitious composites
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