Modeling Fracture Energy of Hooked End Steel Fiber Reinforced Cementitious Composites (HSFRCC)

Abstract:

To model fracture energy of hooked end steel fiber reinforced cementitious composite (HSFRCC),pullout energy of single hooked end steel fiber (HSF) with nondeformed/deformed hooked end was theoretically derived first.Then,statistic method was employed to estimate energy contributions from all HSFs on crack plane.Finally,experimental verification was carried out to verify the model validity and accuracy.Good performance was observed in comparison with experimental results.Moreover,it is shown that this model is closely related to various mesoscale parameters,such as HSF length,hooked end geometry,and matrix strength etc.,which obviously indicates the double functions of this model in both fracture energy prediction and the optimization design of HSFRCC.

Key words:hooked end steel fiber (HSF); cementitious composites; single fiber pullout test; mesoscale parameters; fracture energy model