The Influence of Thermoplastic Film Interleaving on the Interlaminar Shear Strength and Mode I Fracture of Laminated Composites

[+] Author and Article Information
L. Li

School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Ave., Singapore 2263

P. Lee-Sullivan

Department of Mechanical Engineering, The University of New Brunswick, Fredericton, N. B. Canada E3B5A3

K. M. Liew

School of Mechanical and Production Engineering, Nanyang Technological University, Singapore

J. Eng. Mater. Technol 118(3), 302-309 (Jul 01, 1996) (8 pages) doi:10.1115/1.2806810 History: Received November 28, 1994; Revised August 14, 1995; Online November 27, 2007


Results are presented on the interlaminar shear strength (ILSS) and Mode I fracture toughness (GIC ) of glass/epoxy laminates interleaved with thermoplastic polyester films using four-point bending and double cantilever beam tests, respectively. The ILSS equation from classical beam theory was modified to account for the increased film thickness. It was found that the ultimate failure load and ILSS could be doubled if a thermoplastic film of high ductility but low glass transition temperature is used. Good film/composite ply adhesion is necessary. Mode I fracture toughness is influenced by film thickness and interleaving with a 0.2 mm thick film increased the GIC by 40 percent. Interleaving with a thinner film (0.1 mm), however, resulted in adhesive failure and reduced fibre bridging.

Copyright © 1996 by The American Society of Mechanical Engineers
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