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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
K. S. Morioka and J. R. Tarpani
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DOI:10.17265/1934-8975/2017.05.007
Affiliation(s)
Department of Materials Engineering, São Carlos School of Engineering, University of São Paulo, Avenida João Dagnone 1100-Jardim Santa Angelina, São Carlos-SP 13563-120, Brazil
ABSTRACT
In recent
years there has been a strong interest in thermoplastic polymers with self-healing
behaviour, which after suffering mechanically-induced damage self-repair via
energy-activated macromolecular rearrangements. The use of film-shaped
self-regenerating polymers in alternating layers with high-performance
continuous fibre-reinforced thermosetting polymer matrix laminates is
considered particularly attractive in the mitigation of impact damage in
high-demanding components and structures, insofar as the self-healing films may
at the same time toughen the base fibrous thermosetting matrix laminate
composite while providing immediate or subsequent self-repairing according to
the above mentioned mechanisms. In this work, mechanical flexural testing along
with infrared thermography inspection is proposed for
characterizing low temperature (typical of the altitudes in which modern civil
and military aircrafts travel) transverse low-energy ballistic impact damage
(commonly occurring under the above cited conditions) in thermoplastic ionomer
films interleaving carbon-fibre reinforced epoxy matrix laminates, as well as
to assess the degree of success of thermally-activated self-healing process of
ionomeric phase by external heating sources. Preliminary mechanical results
supported the self-healing hypothesis of impact damaged hybrid laminates, and
exploratory thermography imaging of both the as-damaged and as-rejuvenated test
coupons suggested that this nondestructive evaluation technique is sensitive
enough to detect healing effects.
KEYWORDS
Ballistic impact damage, mechanical behaviour, nondestructive inspection, self-healing behaviour, structural hybrid composite laminate.
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