Dependence of Flexural Behavior of Fiber Reinforced Material Fracture Resistance and Beam Size

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Title: Dependence of Flexural Behavior of Fiber Reinforced Material Fracture Resistance and Beam Size

Author(s): Robert J. Ward and Victor C. Li

Publication: Materials Journal

Volume: 87

Issue: 6

Appears on pages(s): 627-637

Keywords: beams (supports); compressive strength; fiber reinforced concretes; flexural strength; fracture properties; load-deflection curve; metal fibers; mor (material); reinforcing materials; shear strength; splitting tensile strength;

DOI: 10.14359/9884

Date: 11/1/1990

Abstract:
The flexural load-deflection curves for mottar reinforced with various fiber types (steel and synthetic) and various fiber volume fractions ate measured using three different beam sizes. Three new flexural toughness indexes that reflect the general shape of the load-deflection curve are defined and calculated. The flexural strength/ tensile strength ratio f,/f/ is proposed as a parameter that reflects material brittleness - a lower value for a more brittle material. Good correlations between two of the new flexural toughness indexes and parameters that involve only, and the fiber length ate found. These results indicate the possibility of getting a good idea of the flexural load-deflection curve by measuring only f and f, in the laboratory. By realizing the dependence of structural behavior on material fracture resistance, and also the ability of the parameters and to characterize this dependence, it is possible to develop simple formulas that directly express this dependence.


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