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Structural Response and Damage Characterisation of NonCrimp Fabric CFRP Panels under Impact Loading

Nesbitt, Scott and Waimer, Matthias and Toso, Nathalie and Vaziri, Reza and Poursartip, Anoush (2019) Structural Response and Damage Characterisation of NonCrimp Fabric CFRP Panels under Impact Loading. 11th Canadian-International Conference on Composites (CANCOM 2019), 22.-25. Juli 2019, Kelowna, BC, Kanada.

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Impact damage formation and resistance is of great importance to all designers of structural components whether mobile or stationary. This is particularly true in the case of composite materials where the lack of a local plastic deformation mechanism means that even small impacts can result in complete fracture of constituent members, accompanied with a substantial or complete loss of the load carrying capabilities in the region of damage. This paper presents the experimental approach used to examine the structural response and resulting damage in non-crimp fabric carbon fibre reinforced epoxy composite samples at varying strain rates. The strain rates considered are those associated with quasistatic, low-velocity impact, and highvelocity impact loading rates. The differentiating characteristics of these regimes is discussed, and their effect on the samples is shown through experimental damage characterisation including physical measurements and ultrasonic C-scans. It is found that there is a clear difference in the form of damage that occurs with a change in strain rate regime. Quasistatic and low-velocity impact loading produces similar damage levels to each-other at similar energies, and results in more extensive fibre fracture and permanent deformation. However, highvelocity impact favours interlaminar matrix failure (delamination), and also absorbs more energy at equivalent lower impact energy levels, producing more damage. The resulting conclusion being that damage from high velocity impact is harder to identify, and damage resistance for lower energy impacts decreases as impact velocity increases – even though the total impact energy may be equivalent.

Item URL in elib:https://elib.dlr.de/128919/
Document Type:Conference or Workshop Item (Speech)
Title:Structural Response and Damage Characterisation of NonCrimp Fabric CFRP Panels under Impact Loading
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nesbitt, ScottThe University of British ColumbiaUNSPECIFIED
Toso, NathalieUNSPECIFIEDhttps://orcid.org/0000-0003-2803-1450
Vaziri, RezaThe University of British ColumbiaUNSPECIFIED
Poursartip, AnoushThe University of British ColumbiaUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Damage, Non-Crimp Fabric, Impact, Strain Rate Dependency, Ultrasonic
Event Title:11th Canadian-International Conference on Composites (CANCOM 2019)
Event Location:Kelowna, BC, Kanada
Event Type:international Conference
Event Dates:22.-25. Juli 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Structural Integrity
Deposited By: Waimer, Matthias
Deposited On:16 Sep 2019 14:51
Last Modified:16 Sep 2019 14:51

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