Journal
COMPOSITE STRUCTURES
Volume 119, Issue -, Pages 777-786Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2014.09.056
Keywords
Fibre metal laminates; Impact; Fracture; Interface; Debonding
Categories
Funding
- Graduate Program of Engineering Mechanics (Finland)
- W. Ahlstrom Research Foundation
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An experimental drop-weight impact investigation was performed for stainless steel fibre metal laminates (FMLs) containing carbon-fibre and glass-fibre-reinforced epoxy layers. The purpose was to study the dependence of metal-composite debonding on the metal's surface morphology, as well as the interaction between debonding and internal damage caused to a composite. Three different steel surface morphologies were studied for the steel-carbon FMLs. Force-contact time and deflection profile measuring, as well as ultrasonic scanning and scanning electron microscopy imaging, were used for impact damage evaluation. Debonding was found to proceed either at the metal and adhesive film interface or cohesively inside the adhesive film. The steel's surface condition did not significantly influence impact response. The research also revealed that debonding between the lower metal sheet and composite part proceeded as mixed mode (I/II) fracture. Debonding was connected to the composite damages by several shear cracks located in the uppermost composite layer. (C) 2014 Elsevier Ltd. All rights reserved.
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