Experimental Study on Fracture Parameter of Three-Point Bending Beam Based on Smart Properties of CFRC

Abstract

According to actuality that softening process has no stable model and mode Ⅰ fracture has been investigated rarely,the smart properties of CFRC are utilized to attain the initial load of three-point bending beam.Double-K criterion is used to compute K~(ini)_(IC) and K~(un)_(IC),which can explain the toughening effect of fiber effectually.The smart properties of CFRC can be used to research mode Ⅰ fracture of three-point bending beam after analysis of the relationships between relative variation of resistance and load,deflection and CMOD which accord with Lorentz fit.The curves of relative variation of resistance before maximum load can illustrate three stages of elastic deformation,stable fracture and unstable fracture.