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Fabrication Of Adhesively-Bonded CFRP T-Joints For Stiffener Pull-Off Tests
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Orientador(es)
Resumo(s)
Adhesively bonded joints have been increasingly applied in primary aerostructures, mainly due to
their numerous advantages over riveted or fastened joints. More specifically, bonded T-joints made
from carbon fibre reinforced plastics (CFRP) are commonly found as stiffening members
(stiffeners, or stringers) on wing panels and fuselage sections. However, aluminium stiffeners can
yet be considered a safer and more conservative solution, since composite T-joints face
delamination problems that typically initiate at the central noodle of the stiffener - the part where
the three arms of the stiffener come together.
In order to better comprehend the failure mechanisms and sequence of these joints, Stiffener-Pull-
Off Tests (SPOT) were experimentally conducted on a two CFRP adherends (SEAL® Texipreg
HS 160 REM) - skin and stiffener - adhesively bonded with a structural film adhesive (EA451
U150). These specimens were fabricated following a novel fabrication plan,
which left open the possibility of re-engineering the noodle region with the scope of increasing the
through-thickness strength of the bonded joint. This can be achieved by eliminating the problem
of the twisted fibres at the noodle that occur during the cure stage when no filler material is used.
Descrição
Palavras-chave
Adhesive bonding T-joint Structural adhesive Skin-to-stiffener connection