Micromechanics of crack bridging stress-displacement and fracture energy in steel hooked-end fiber-reinforced cementitious composites

摘要: This paper presents a probabilistic micromechanical framework for analyzing crack bridging stressdisplacement in short steel hooked-end fiber-reinforced cementitious composites, featuring the fiber length/diameter aspect ratios of 45 and 80, with varying volume fractions snubbing coefficients. The proposed formulation is constructed based on randomly located, oriented distribution fibers. random nature accounts dominant features composite failure mechanisms. fracture energy dissipation may be obtained from area under tension-softening curve. dissipations contributed by interfacial debonding pullout both straight-part element are systematically investigated. Further, mechanism stress-displacement accommodated. attributable to shown smaller than that straight element, but still remains significant. Comprehensive comparisons between constant shear model predictions experimental data manifest significant improvements when effects incorporated into analyses. Based predictions, we recommend range fraction 0.75% 1%.