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Fracture Energy Optimization in Synthetic Fiber Reinforced Cementitious Composites

Published online by Cambridge University Press:  16 February 2011

Victor C. Li ,
Youjiang Wang  and
Stanley Backer
Victor C. Li
Affiliation:
Advanced Civil Engineering Materials Research Laboratory, Department of Civil Engineering, University of Michigan, Ann Arbor, MI 48109
Youjiang Wang
Affiliation:
School of Textile & Fiber Engineering, Georgia Institute of Technology, Atlanta, GA 30332
Stanley Backer
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

A study has been carried out on cementitious composites reinforced with various synthetic fibers, focusing on their tensile behavior, toughness, and fracture mechanisms. A model is formulated to predict the tensile behavior and fracture energy of fiber reinforced cementitious composites (FRC) with short, randomly distributed fibers. The model accounts for the pull-out of fibers oblique to the fracture surfaces (including snubbing friction effect), and the variation of the fiber/matrix interfacial shear stress during pull-out. Experimental and analytical results are shown to be in close agreement for the one class of fiber reinforcement which best satisfies the assumptions of the model. Systems which violate the assumptions exhibited different failure mechanisms and were observed to show less satisfactory reinforcement performance, especially the composite fracture energy. The model is used to examine the effect of fiber properties on composite post-cracking behavior and is useful in design of such material systems with optimum performance and cost effectiveness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 211: Symposium O – Fiber-Reinforced Cementitious Materials , 1990 , 63
Copyright
Copyright © Materials Research Society 1991

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References

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