期刊
NDT & E INTERNATIONAL
卷 98, 期 -, 页码 130-133出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2018.05.007
关键词
Local defect resonance (LDR); In-plane resonance; Non-destructive testing (NDT); Composite materials
资金
- Research Foundation Flanders (FWO) [1148018N]
- SIM (Strategic Initiative Materials in Flanders) [160455]
- VLAIO (Flemish government agency Flanders Innovation & Entrepreneurship) [160455]
Local defect resonance (LDR) makes use of high frequency vibrations to get a localized resonant activation of the defect. In this study, it is shown for various samples and damage features that the classical out-of-plane local defect resonance can be equally extended towards in-plane local defect resonance. It is found that the in-plane LDR typically occurs at higher frequencies, which is linked to the specific geometry of common defects. This increased frequency allows for a reduction in measurement time. More importantly, the results indicate that the in-plane LDR has an increased sensitivity for defects with dominant out-of-plane defect interfaces (e.g. surface breaking crack). Knowledge of both the out-of-plane and in-plane LDR provides further insight on the internal structure of a defective area. This is explicitly demonstrated on a carbon composite which was subjected to low velocity impact, inducing barely visible impact damage.
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