Analysis of vibration for regions above rectangular delamination defects in solids
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- Analysis of vibration for regions above rectangular delamination defects in solids
- Oh, Taekeun; Popovics, John S.; Sim, Sung-Han
- Asymptotic method; Concrete samples; Defects in solids; Edge effect; Finite element simulations; Flexural vibration frequencies; Higher-order modes; Impact resonance; Length-to-depth ratios; Near-surface; Rectangular plates; Semi-analytical
- Issue Date
- ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
- JOURNAL OF SOUND AND VIBRATION, v.332, no.7, pp.1766 - 1776
- We propose a semi-analytical approach to predict the natural flexural vibration frequencies of the material overlying a near-surface delamination defect in a solid. The formulation accommodates arbitrary length to depth ratio of the defect and higher-order modes of vibration. The material above the defect is modeled as a semi-clamped rectangular plate, where the dynamic edge effect factors, as deduced by Bolotin's asymptotic method, are estimated. The formulation results are evaluated through comparison to 3-D finite element (FE) simulation and experimental results obtained from impact resonance tests on concrete samples with controlled delamination defects. Good agreement with both experimental and 3-D FE results confirms the accuracy of the formulation in all cases.
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