Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 21, Issue 12, Pages 1937-1947Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/BF03177451
Keywords
glass fiber aluminum hybrid laminates; tensile behavior; fracture process; delamination
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Tensile properties and fracture toughness of monolithic aluminum (At), glass fiber reinforced plastics (GFRPs) and glass fiber/aluminum hybrid laminates (GFMLs) were examined in relation to the fracture processes of plain coupon and single-edge-notched specimens. Elastic modulus and ultimate tensile strength of GFMLs showed characteristic dependences on the kind of At, fiber orientation and the Al/fiber layer composition ratio. Fracture toughnesses K-C and G(C) of A-GFML-UD were comparable to those of GFRP-UD and were much superior to monolithic Al. However, GFML with a transverse crack parallel to the fiber layer deteriorated largely in toughness. Microscopic observation of the fracture zone in the vicinity of the crack tip revealed various modes of micro-cracks in the respective layers as well as fiber fractures and delamination between fiber/Al layers. Such damage advances in GFMLs dependent on the orientation of the fiber layer and the Al/fiber composition ratio strongly influenced the strength and toughness of GFMLs.
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