Journal ArticleDOI
Round Robin Testing for Mode I Interlaminar Fracture Toughness of Composite Materials
TK O'Brien,RH Martin +1 more
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In this article, the results of several interlaboratory "round robin" test programs for measuring the Mode I interlaminar fracture toughness of advanced fiber-reinforced composite materials are summarized.Abstract:
This report summarizes the results of several interlaboratory “round robin” test programs for measuring the Mode I interlaminar fracture toughness of advanced fiber-reinforced composite materials. Double cantilever beam (DCB) tests were conducted by participants in ASTM Committee D-30 on High Modulus Fibers and Their Composites and by representatives of the European Group on Fracture (EGF) and the Japanese Industrial Standards Group (JIS). DCB tests were performed on three AS4 carbon fiber-reinforced composite materials: AS4/3501-6 with a brittle epoxy matrix, AS4/BP907 with a tough epoxy matrix, and AS4/PEEK with a tough thermoplastic matrix. Difficulties encountered in manufacturing panels, as well as conducting the tests, are discussed. Critical issues that developed during the course of the testing are highlighted. Results of the round robin testing used to determine the precision of the ASTM DCB test standard are summarized.read more
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References
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Journal ArticleDOI
The analysis of interlaminar fracture in uniaxial fibre-polymer composites
TL;DR: In this article, a detailed study of the methods of analysing the experimental data obtained from fracture mechanics tests using double-cantilever beam, end loaded split and end notched flexure specimens.
Journal ArticleDOI
Determination of Fracture Surface Energies by the Cleavage Technique
TL;DR: In this paper, a modified cleavage technique was applied to the glassy polymers poly(methyl methacrylate) and polystyrene for which comparative data are available from both tensile and cleavage experiments.
Journal ArticleDOI
The interlaminar fracture of organic-matrix, woven reinforcement composites
TL;DR: In this paper, a double cantilever beam specimen was used and was width-tapered for constant change in compliance with crack length so that the fracture energy calculation is independent of crack length.
Journal ArticleDOI
Investigation of fiber bridging in double cantilever beam specimens
W. S. Johnson,P. D. Mangalgiri +1 more
TL;DR: In this article, double cantilever beam (DCB) specimens were made using unidirectional lay-ups of T6C/Hx205 composite material in which the delaminating halves were placed at angles of 0, 1.5, and 3 degrees to each other.
Journal ArticleDOI
Microfocus radiography studies during mode I interlaminar fracture tests on composites
TL;DR: In this paper, the application of two real-time mathods (microfocus radiography and acoustic emission) to follow crack initiation and propagation is described, an approach which allows the hypotheses implicit in current data analysis to be examined critically.
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