Abstract
So far, many techniques for detecting cracks in structures using dynamical response have been proposed. Most of them assume that the cracks are open crack, which does not close during vibration. However many of actual cracks are breathing crack which opens and closes during vibration. In this paper, a technique for detecting breathing cracks in a beam using dynamical response is proposed. When a breathing crack opens, it reduces flexural rigidity of the beam locally. The proposed technique introduces parameters that express the reduction in the flexural rigidity, and determines values of the parameters such that they yield the closest responses to measured ones. In order to check applicability of the proposed technique numerical simulation is conducted.
