Effect of viscoelastic losses on resonance radiation from imperfections

NDT, using acoustic emission techniques, often requires an adequate interpretation of the resonance response. In this Paper, the effect of viscoelastic losses on resonance caused by imperfections due to oscillating dislocations is evaluated. For simplicity of interpretation, three simple viscoelastic materials are considered. The results show that while damping has a small effect on the first resonance response, higher resonances are considerably reduced and that near antiresonant frequencies the amplitudes of vibration may actually be increased.