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Impact monitoring of CFRP composites with acoustic emission and laser Doppler vibrometry

Grigg, S., Almudaihesh, F., Roberts, M. and Pullin, R. 2021. Impact monitoring of CFRP composites with acoustic emission and laser Doppler vibrometry. Engineering Research Express 3 (1) , 015012. 10.1088/2631-8695/abde8b

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Abstract

The use of Acoustic Emission (AE) to detect impacts is of interest within industries where vital components are prone to impact damage, in particular where Carbon Fibre Reinforced Polymers (CFRP) are used, as damage can often go un-noticed within them. For AE monitoring of impacts piezoelectric sensors are used to detect the ultrasonic wave produced by an impact. Classification is also possible of these waves enabling a distinction between damaging and non-damaging impacts. These sensors do however have resonance, so do not give an accurate picture of how the waves propagate, better knowledge would enable better selection of sensors. Laser Doppler Vibrometry is a non-contact and non-resonant method of analysing the surface displacement on a structure. In this study, a vibrometer was used to monitor CFRP plates during impact to assess its applicability for distinguishing between damaging and non-damaging impacts, compared with a surface mounted AE sensor. The vibrometer was able to detect both low frequency flexural modes due to the impact process and the higher frequency extensional modes, initiated by damage. When compared to the AE sensor the vibrometer was comparable in its results, and unlike the sensor, not susceptible to resonance or decoupling. For the tested material the vibrometer identified frequencies greater than 20 kHz to be associated with damaging impacts.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Publisher: IOP Publishing
ISSN: 2631-8695
Date of First Compliant Deposit: 21 January 2021
Date of Acceptance: 21 January 2021
Last Modified: 25 Mar 2021 14:54
URI: http://orca.cf.ac.uk/id/eprint/137861

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