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The receptance function is the important dynamic characteristic of structures which interrelates the harmonic excitation and the response of a structure in the frequency domain. In this work, the “receptance curvature” is defined as the second derivative of the receptance. It is well known that when there are cracks the mode shape of beam has sharp change at the crack position. Thus, the receptance curvature will also be changed at the crack position since the receptance curvature is a function of mode shape. In this work, the experiment has been carried out to measure the receptance and the receptance curvature. The purpose is to justify the formulas developed in the previous work. The experimental results are compated to the numerical simulation to show that the receptance curvature can be used for the crack detection of beam.
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