Převod diagramu síla - průhyb za tříbodového ohybu na vztah napětí - rozevření trhliny

In this paper, an analytical form of the transformation from the force – deflection diagram obtained under a three-point bending into the stress – crack opening relationship of concrete with polypropylene fibers is outlined. The transformation is based on the description of the kinematic behavior of the test sample. The stress is approximated by a combination of exponential functions supplemented with a term capturing the slip of fibers bridging the crack.