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 a previous report the authors proposed a technique for detecting breathing cracks in a beam. It detects the cracks assuming the cracks may exist on the upper surface or lower surface of the beam. In this report the proposed techniqe is extended to determine simultaneously the surface on which breathing cracks exist. Numerical simulation is conducted to show the applicability of the proposed technique.
