1 April 2016 Highlights and challenges in nondestructive evaluation for metallic and composite structures
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The paper presents methods and techniques oriented towards structural health monitoring (SHM) and (ENDT) for both metallic and composite structures. Particularly the paper is dedicated to elastic waves propagation phenomenon, scanning laser vibrometry, electromechanical impedance and terahertz spectroscopy. Selected numerical modelling aspects of the phenomena related to the mentioned methods are addressed. Moreover it covers the main disciplines which are related to above mentioned techniques as piezoelectric sensors and transducers, and signal processing. The signal processing approach is crucial allowing extracting damage related features from the gathered signals.

Investigated damage is in the form of mechanical failures as cracks, delaminations, debonding, voids. Also methods dedicated to thermal degradation, moisture and chemical contamination are shown. Presented methods are also suitable for performance of bonded joints assessment. Problem of external factor (temperature, load) on investigated methods is also discussed in this paper. The characteristic of each method is summarized by a critical look. Promising combination of selected techniques should lead to an innovative approach to ensure safety operation of structures. All problems have been dealt with a hybrid experimental – numerical approach.
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Wiesław M. Ostachowicz, Wiesław M. Ostachowicz, Tomasz Wandowski, Tomasz Wandowski, Paweł H. Malinowski, Paweł H. Malinowski, Paweł Kudela, Paweł Kudela, "Highlights and challenges in nondestructive evaluation for metallic and composite structures", Proc. SPIE 9806, Smart Materials and Nondestructive Evaluation for Energy Systems 2016, 98060F (1 April 2016); doi: 10.1117/12.2219662; https://doi.org/10.1117/12.2219662

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