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Impact and Damage Localisation of Carbon‐Fibre‐Reinforced Plastic Plates
Author(s) -
Ungethuem Andy,
Lammering Rolf
Publication year - 2011
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201110309
Subject(s) - isotropy , anisotropy , materials science , bending , wave propagation , signal (programming language) , acoustics , composite material , structural engineering , computer science , optics , engineering , physics , programming language
Due to increasing usage of light weight structures and carbon‐fibre‐reinforced plastics well‐known procedures for the examination of components inefficient in terms of efforts or costs. Therefore, the development of a complementary system is suggested which allows for detecting damaging events and damages in a structure. A new wave migration model enables to determine the location of an impact for non‐isotropic plates. The method is based on the wave propagation after an impact. Piezo‐electric sensors capture the strain caused by the propagating wave. The evaluation and processing of the signals of at least four sensors allow for the calculation of the impact location from the runtime of the signals. In the case of non‐isotropic material the shape of the wave front has to be known for the structure under investigation, for example experimentally due to measurement and monitoring of the wave propagation by a Laservibrometer or analytically by calculating the propagation speed of bending waves. On the same basis damage localisation in anisotropic carbon‐fibre‐reinforced plastic plates is possible. Considerations to signal analysis using wavelet transformation are presented and both models are validated experimentally. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)