Interlaminar fracture toughness for composite materials

✍ Scribed by Kang Yong Lee; Soon Man Kwon

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 469 KB
• Volume: 45
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(93)90073-2

✦ Synopsis

A new equation for the energy release rate for a double cantilever beam specimen is proposed within the framework of the higher order shear deformable plate theory. The interlaminar fracture toughnesses (IFTs) found using the present theory, the ASTM round robin test method and the acoustic emission method are compared for thermoset graphite/epoxy and thermoplastic AS4/PEEK composites. As a result. IFTs by the present theory show agreement within 5% when compared with those found using the ASTM method and it is shown that IFTs found by the acoustic emission method are lower than those found by the ASTM method. It is observed that the IFT of the thermoplastic AS4/PEEK composite is about 10 times larger than that of the thermoset graphite/epoxy composite.