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Pulsed and Vibro Thermographic results

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posted on 20.01.2020, 08:58 by Shakeb Deane, Clemente Ibarra-Castanedo, Nico Avdelidis, Antonios Tsourdos, hai zhang, Xavier P. V. Maldague, Alex Williamson, Timothy MacKley, Hamed Yazdani Nezhad, maxwell davis

The CFRP specimens were manufactured and purposely damaged via impact, in the Cranfield composite centre. Sample A4 was manufactured via manual woven, and the other two samples were unidirectional. The composites consist of laying up pre-preg piles to form a laminate stack, the material is then autoclave processed at 180oC and 7 bars for a few hours suitable for the thermoset resin cure, this is according to the supplier’s specification (Hexcel). There were three specimens, one that was undamaged, and two that had been impacted with a force of 15 and 20 J of energy. The infrared camera used in this experiment was a FLIR Phoenix, with inSb sensor material, 3-5 mm, 640x512 pixels and allows data acquisition at 50Hz.

The surface of the specimens were positioned parallel to the camera lens. The data was acquired for 40 seconds with a 1.5 millisecond integration time, that includes 10 frames before the flashes, plus 1990 frames during cooling a total of 2000 frames where recorded. The software used to acquire the data was RDac from FLIR. For signal processing MATLAB and Ir_view from Visiooimage inc were employed. Two advanced processing techniques were used; PCT (principal component thermography) and PPT (pulsed phase thermography).


EPSRC - EP/N509450/1


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