In this paper, the authors present the results of part of an extensive research programmed where the dynamic behavior of a cracked free-free straight beam, with rectangular cross-section, is analysed both theoretically and experimentally. The experimental procedure was carefully programmed, in order to guarantee a high level of accuracy, and was carried out for several different crack locations and depths. Initially cracks were simulated using a milling machine with a very thin cutting tool, and measurements were performed for both in-plane and out-of-plane flexural vibrations. Later, the question of a simulated crack behaving like an ideal line crack was also addressed, Real cracks were developed in a set of beams, by means of the three-point-bending method, and the test specimens' dynamic behaviour was analysed. Results are presented and discussed.
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