Journal
ENGINEERING FRACTURE MECHANICS
Volume 290, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2023.109498
Keywords
Fracture toughness; Sandwich structures; Interface; Damage tolerance
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The methods of improving the toughness of the bond between a foam core and a carbon fibre face-sheet in a sandwich structure were investigated. It was found that introducing machined grooves in the foam and using core-shell rubber particles to toughen the face-sheets resulted in significant improvements in bond toughness. Additionally, using aramid fiber-reinforced foam as the core of the sandwich structure also contributed to enhancing the interface bond toughness and promoting R-curve behavior during crack propagation.
Methods of improving the toughness of the bond between a foam core and a carbon fibre face-sheet in a sandwich structure were investigated. The Single Cantilever Beam (SCB) on a travelling platform was identified as an appropriate mode-I dominant test-method. The introduction of machined grooves in the foam resulted in a 50% improvement in the measured toughness of the face-sheet-core bond. Toughening of the face-sheets via core-shell rubber particles resulted in a change in fracture locus away from the interface and into the foam. The use of aramid fibre-reinforced foam as the core of the sandwich was also found to improve the interface bond toughness by up to 50%. The fibre-reinforced foams promoted the emergence of R-curve behaviour as the crack propagated.
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