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Interfacial design and flexural property of CFRP/aluminum-honeycomb sandwich with Aramid-pulp micro/nano-fiber interlays.
- Source :
-
Composite Structures . Jun2022, Vol. 289, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • Aramid-pulp (AP) was used for interfacial toughening inside laminar CFRP and at the interface between CFRP and honeycomb. • Stronger adhesive bonding from resin pre-coating (RPC) surface treatment at the interface between CFRP and honeycomb. • Enhanced structural performances of the sandwich even the number of carbon-fiber layers in face-sheets was reduced. • Failure and toughening mechanisms from AP inside CFRP panels and at the interface between CFRP and honeycomb were explained. This study proposes three interfacial designs for CFRP/aluminum-honeycomb sandwich to enhance interlayer of CFRP panels and adhesive interface between CFRP panel and honeycomb using sparsely distributed Aramid-pulp (AP) micro-/nano-fibers as interlayers. In laminar CFRP, AP-fiber free-ends protruded into adjacent carbon-fiber plies generate strong cross-ply fiber-bridging to prevent premature delamination. Adhesive joints with AP at the interfaces between CFRP and honeycomb form in-situ fillets and a randomly AP-reinforced composite layer. Meanwhile, Resin Pre-Coating (RPC) on the sanded CFRP and honeycomb core is used to improve the bonding capacity and create rounded fillet joints at the honeycomb edge. Three-point-bending tests show the sandwiches with toughened interfacial designs have higher peak load (+43.04%–57.60%), post-peak average load (+28.38%–163.25%) and energy-absorption (+15.52%–81.69%). The AP-toughened sandwich with 8-plies CFRP is stronger than the common sandwich with 10-plies even 12-plies CFRP. Failure and toughening mechanisms from both interfaces (e.g., delamination with fiber-bridging, matrix cracks in CFRP, debonding, cohesive failure with fiber-bridging, pulling-up of fiber, buckling of core, etc.) were explained by micrographs combined with schematic illustration. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02638223
- Volume :
- 289
- Database :
- Academic Search Index
- Journal :
- Composite Structures
- Publication Type :
- Academic Journal
- Accession number :
- 156198495
- Full Text :
- https://doi.org/10.1016/j.compstruct.2022.115486