56. Multi-damage detection in composite structure
Yongming Feng1, Li Zhou2, Bo Ni3, Jianyuan Yang4, Weidong Chen5
1, 2State Key Laboratory of Mechanics
and Control of Mechanical Structures,
1, 3, 4, 5Beijing Aeronautical Technology Research Center, Beijing, China
(Received 12 June 2014; received in revised form 24 July 2014; accepted 7 September 2014)
Abstract. In this paper a pre-stack reverse-time migration concept of signal processing techniques is developed and adapted to guided-wave propagation in composite structure for multi‑damage imaging by experimental studies. An anisotropic laminated composite plate with a surface‑mounted linear piezoelectric ceramic (PZT) disk array is studied as an example. At first, Mindlin Plate Theory is used to model Lamb waves propagating in laminates. The group velocities of flexural waves are also derived from dispersion relations and validated by experiments. Then reconstruct the response wave fields with reflected data collected by the linear PZT array. Reverse‑time migration technique is then performed to back-propagate the reflected energy to the damages using a two‑dimensional explicit finite difference algorithm and damages are imaged. Stacking these images together gets the final image of multiple damages. The results show that the pre‑stack migration method is hopeful for damage detection in composite structures.
Keywords: multi-damage detection, structural health monitoring system (shms), composite structure, mindlin plate theory.
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Cite this article
Feng Yongming, Zhou Li, Ni Bo, Yang Jianyuan, Chen Weidong Multi-damage detection in composite structure. Journal of Measurements in Engineering, Vol. 2, Issue 3, 2014, p. 164‑172.
Journal of Measurements in
Engineering. September 2014, Volume 2, Issue 3