Journal
SENSORS
Volume 23, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/s23187926
Keywords
delamination damage; vibrations; laminated composite shells; inverse finite element method; refined zigzag theory
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In this study, a delamination detection approach based on equivalent von Mises strains is proposed for vibrating laminated composite plates. By using the inverse finite element method, real-time monitoring and detailed information about damage can be obtained. The proposed method demonstrates good robustness in numerical case studies associated with harmonic and random vibrations.
Delamination damage is one of the most critical damage modes of composite materials. It takes place through the thickness of the laminated composites and does not show subtle surface effects. In the present study, a delamination detection approach based on equivalent von Mises strains is demonstrated for vibrating laminated (i.e., unidirectional fabric) composite plates. In this context, the governing relations of the inverse finite element method were recast according to the refined zigzag theory. Using the in situ strain measurements obtained from the surface and through the thickness of the composite shell, the inverse analysis was performed, and the strain field of the composite shell was reconstructed. The implementation of the proposed methodology is demonstrated for two numerical case studies associated with the harmonic and random vibrations of composite shells. The findings of this study show that the present damage detection method is capable of real-time monitoring of damage and providing information about the exact location, shape, and extent of the delamination damage in the vibrating composite plate. Finally, the robustness of the proposed method in response to resonance and extreme load variations is shown.
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