Journal
POLYMER TESTING
Volume 44, Issue -, Pages 224-233Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2015.04.013
Keywords
Thermal diffusivity; Thermal nondestructive testing; Impact damage; Tomography; Modeling
Funding
- NIR [445]
- Russian Ministry of Higher Education
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One-sided thermal non-destructive testing (TNDT) is of vital importance in aerospace composites to monitor structural degradation, as well as to detect subsurface defects. The objective of this study is to evaluate simultaneously the thermal diffusivity and to characterize the defects within carbon fiber reinforced polymer (CFRP) composites. In this paper, a novel one sided TNDT technique is presented which relies on creating an artificial inflection point by multiplying front-surface temperature evolution by nth power of time, where 0 < n < 0.5, followed by optimization of n. An analytical solution of the diffusivity calculation and defect characterization in the case of CFRP composite plate is discussed. The characterization of low velocity impact damage is also investigated with the help of theoretical and experimental results. Some key research points which need further exploration are also discussed. (C) 2015 Elsevier Ltd. All rights reserved.
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