TY - JOUR
T1 - Graphene nanoplatelets/epoxy nanocomposites as conductive adhesives for out-of-autoclave in-situ CFRPs repair
AU - Kinloch, Ian
AU - Xia, Tian
A2 - Valles, Cristina
A2 - Huang, Yuheng
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/5/26
Y1 - 2023/5/26
N2 - Novel out-of-autoclave (OoA) strategies for repairing carbon fibre reinforced plastics (CFRPs) were investigated to enable facile maintenance of components and, thus, reduce unnecessary scrappage. Oven cured GNPs/epoxy bulk and film nanocomposites were first fabricated over a range of GNPs loadings to determine their percolation threshold and Joule heating properties. Based upon these results, electrically conductive uncured nanocomposites with different GNPs loadings were then used as adhesives to repair CFRPs through Joule heat curing of the electrically conductive GNPs network embedded in the epoxy. The GNPs loading in the adhesive was found not to influence the spatial distribution of the heat generated during repair, however it did affect the heating rate. The lap shear strengths found for the CFRPs repaired by Joule heating were the same as though for CFRPs repaired using a conventional oven curing method, evidencing the effectiveness of this approach as an OoA repair method. Scanning electron microscopy revealed the coexistence of interfacial and cohesive failure mechanisms, with an increasing dominance of the cohesive as the GNPs loading increased.
AB - Novel out-of-autoclave (OoA) strategies for repairing carbon fibre reinforced plastics (CFRPs) were investigated to enable facile maintenance of components and, thus, reduce unnecessary scrappage. Oven cured GNPs/epoxy bulk and film nanocomposites were first fabricated over a range of GNPs loadings to determine their percolation threshold and Joule heating properties. Based upon these results, electrically conductive uncured nanocomposites with different GNPs loadings were then used as adhesives to repair CFRPs through Joule heat curing of the electrically conductive GNPs network embedded in the epoxy. The GNPs loading in the adhesive was found not to influence the spatial distribution of the heat generated during repair, however it did affect the heating rate. The lap shear strengths found for the CFRPs repaired by Joule heating were the same as though for CFRPs repaired using a conventional oven curing method, evidencing the effectiveness of this approach as an OoA repair method. Scanning electron microscopy revealed the coexistence of interfacial and cohesive failure mechanisms, with an increasing dominance of the cohesive as the GNPs loading increased.
KW - A. Adhesive joints
KW - A. Graphene
KW - A. Nano composites
KW - B. Electrical properties
KW - B. Mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85151245810&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/b6e318a0-466c-3be5-875a-8a4730727cf6/
U2 - 10.1016/j.compscitech.2023.110007
DO - 10.1016/j.compscitech.2023.110007
M3 - Article
SN - 0266-3538
VL - 237
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 110007
ER -