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Title: | Singular energy component for identification of initial delamination in CFRP laminates through piezoelectric actuation and non-contact measurement | Authors: | Xu, W Su, Z Liu, J Cao, M Ostachowicz, W |
Issue Date: | Apr-2020 | Source: | Smart materials and structures, Apr. 2020, v. 29, no. 4, 045001 | Abstract: | Delamination is typically barely visible impact damage in carbon fiber reinforced polymer (CFRP) laminates. It is important to identify initial delamination in the early stage. The concept of 2D multi-resolution modal Teager–Kaiser energy (MRM-TKE2D) was recently proposed to reveal delamination-caused singularity in a mode shape for delamination identification with high robustness against environmental noise. However, inadequate sensitivity impairs its capability to identify initial delamination. A damage indicator needs to be further formulated to characterize the presence and location of initial delamination. To address this problem, a scheme of decomposing the MRM-TKE2D into components is proposed for identification of initial delamination. Among the energy components of the MRM-TKE2D for a CFRP laminate with an initial delamination, a singular energy component is dominated by the delamination and can be determined by its spectral entropy. In the singular energy component, energy converges into the delamination region to form a singular peak and almost vanishes in other places, from which the presence and location of the initial delamination can be characterized by the singular peak. This method is numerically verified on CFRP laminates with initial delamination. Its applicability is experimentally validated by identifying an initial delamination in a CFRP laminate, the mode shapes of which are acquired by piezoelectric actuation using a lead-zirconate-titanate actuator and non-contact measurement using a scanning laser vibrometer. Numerical and experimental results show that singular energy components are capable of identifying initial delamination under noisy environments. | Keywords: | 2D multi-resolution modal Teager-Kaiser energy CFRP laminate Initial delamination Non-contact measurement Piezoelectric actuation Singular energy component |
Publisher: | Institute of Physics Publishing Ltd. | Journal: | Smart materials and structures | ISSN: | 0964-1726 | EISSN: | 1361-665X | DOI: | 10.1088/1361-665X/ab6fe6 | Rights: | © 2020 IOP Publishing Ltd This is the Accepted Manuscript version of an article accepted for publication in Smart Materials and Structures. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-665X/ab6fe6. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Appears in Collections: | Journal/Magazine Article |
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Xu_Singular_Energy_Component.pdf | Pre-Published version | 2.11 MB | Adobe PDF | View/Open |
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