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Keywords: Lamb wave, damage identification, carbon fibre reinforced polymer laminates, metallic structures, reflection intensity.

Summary

A powerful Mindlin pseudospectral plate element [1] is employed for efficiently simulating the Lamb wave propagation in damaged metallic and carbon fibre reinforced polymer (CFRP) laminated structures. The experimental verifications of a one-dimensional wave propagation problem in delaminated CFRP beams [2] and a two-dimensional wave propagation problem in a metallic plate with a hole [1] have been used to demonstrate the efficiency of the present plate element. By employing this numerical approach, extensive explorations have been undertaken to analyze the influence of various wave parameters, for example, excitation frequency, on the reflection intensity from various damage, including delamination in the laminates, or holes and cracks in metallic plates. The influence of damage size and shape on the intensity of the reflections in metallic structures have also been investigated, and formulated for evaluating the damage size. Two important conclusions have been made in this research. The first is that there are multiple optimal excitation frequencies to obtain the strongest reflection intensity, which are close to the resonant natural frequencies of the local damaged region. The second is that it is possible to evaluate the damage size by using the relationship formulated between the damage size and the reflection intensity in metallic structures.

References

1: Y. Liu, N. Hu, C. Yan, H. Fukunga, X. Peng, B. Yan, "Construction of a Mindlin Pseudospectral Plate Element and Evaluating Efficiency of the Element", Finite Elements in Analysis and Design, 45, 538-546, 2009. doi:10.1016/j.finel.2009.03.004
2: N. Hu, Y. Liu, Y. Li, X. Peng, B. Yan, "Optimal Excitation Frequency of Lamb Waves for Delamination Detection in CFRP Laminates", Journal of Composite Materials, 44(13), 1643-1663, 2010. doi:10.1177/0021998309353965

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 93 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: Paper 50 Damage Evaluation using Reflection Intensity from Damage in Metallic and Carbon Fibre Reinforced Polymer Laminated Structures N. Hu¹, H. Fukunaga², Y. Liu¹ and Y. Li¹ ¹Department of Mechanical Engineering, Chiba University, Japan ²Department of Aerospace Engineering, Aramaki-Aza-Aoba, Sendai, Japan doi:10.4203/ccp.93.50 purchase the full-text of this paper Full Bibliographic Reference for this paper N. Hu, H. Fukunaga, Y. Liu, Y. Li, "Damage Evaluation using Reflection Intensity from Damage in Metallic and Carbon Fibre Reinforced Polymer Laminated Structures", in , (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 50, 2010. doi:10.4203/ccp.93.50 Keywords: Lamb wave, damage identification, carbon fibre reinforced polymer laminates, metallic structures, reflection intensity. Summary A powerful Mindlin pseudospectral plate element [1] is employed for efficiently simulating the Lamb wave propagation in damaged metallic and carbon fibre reinforced polymer (CFRP) laminated structures. The experimental verifications of a one-dimensional wave propagation problem in delaminated CFRP beams [2] and a two-dimensional wave propagation problem in a metallic plate with a hole [1] have been used to demonstrate the efficiency of the present plate element. By employing this numerical approach, extensive explorations have been undertaken to analyze the influence of various wave parameters, for example, excitation frequency, on the reflection intensity from various damage, including delamination in the laminates, or holes and cracks in metallic plates. The influence of damage size and shape on the intensity of the reflections in metallic structures have also been investigated, and formulated for evaluating the damage size. Two important conclusions have been made in this research. The first is that there are multiple optimal excitation frequencies to obtain the strongest reflection intensity, which are close to the resonant natural frequencies of the local damaged region. The second is that it is possible to evaluate the damage size by using the relationship formulated between the damage size and the reflection intensity in metallic structures. References 1 Y. Liu, N. Hu, C. Yan, H. Fukunga, X. Peng, B. Yan, "Construction of a Mindlin Pseudospectral Plate Element and Evaluating Efficiency of the Element", Finite Elements in Analysis and Design, 45, 538-546, 2009. doi:10.1016/j.finel.2009.03.004 2 N. Hu, Y. Liu, Y. Li, X. Peng, B. Yan, "Optimal Excitation Frequency of Lamb Waves for Delamination Detection in CFRP Laminates", Journal of Composite Materials, 44(13), 1643-1663, 2010. doi:10.1177/0021998309353965 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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