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Micromechanics Based Design for Pseudo Strain-Hardening in Cementitious Composites

by Victor C. Li, Univ of Michigan, Ann Arbor, United States,
H. C. Wu, Univ of Michigan, Ann Arbor, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

Micromechanical model constructed on the basis of fracture mechanics and fiber bridging provides a means of selection of fiber, matrix and interface property combinations for which short random fiber reinforced cementitious composites will undergo pseudo strain-hardening when loaded beyond the elastic limit. This paper reviews the basic elements of the micromechanical model, and demonstrate with experimental results how pseudo strain-hardening has been achieved. Emphasis will be placed on the fact that fiber volume fraction is but one adjustable parameter in tailoring the material composition for pseudo strain-hardening. The role of other parameters, such as fiber aspect ratio, matrix toughness, and interfacial bond strength in controlling pseudo strain-hardening, are discussed.

Subject Headings: Composite materials | Fabrics | Micromechanics | Cement | Strain hardening and softening | Fiber reinforced composites | Matrix (mathematics)

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