The fracture energy of some epoxy resin materials
The double cantilever beam technique has been used to measure the fracture energy of a series of cured epoxy resins. A range of materials was produced by varying the proportion of resin to hardener agent (Araldite CT200 and hardener HT901 — phthalic anhydride, CIBA Ltd) and by adding silica flour or aluminium powder as a filler.
The fracture energy for crack initiation in the cured epoxy resins ranged from approximately 103 to 105 erg cm−2, and in the “filled resins” from 104 to 5×105 erg cm−2, as the proportion of hardener increased. The fracture energy for crack arrest was somewhat lower at the higher hardener contents and particularly for the Al-filled material.
KeywordsPolymer Aluminium Epoxy Anhydride Crack Initiation
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- 1.J. D. Eshelby, “Fracture Toughness” Chapter 3 pub. No. 121 (Iron and Steel Inst., London, 1968).Google Scholar
- 3.J. J. Gilman, “Fracture”, edited by A. L. Averbachet al (Wiley, New York, 1959).Google Scholar
- 5.B. Gross andJ. E. Srawley, NASA tech. note D3295 (1966).Google Scholar
- 7.B. J. Hayes, “The Plastics Manual” (Scientific Press, 1962) p. 27.Google Scholar
- 8.A. H. Cottrell,Proc. Roy. Soc. A282 (1964) 2.Google Scholar
- 9.D. M. Marsh,ibid A279 (1964) 420.Google Scholar
- 10.J. J. Benbow andF. C. Roesler,Proc. Phys. Soc. B70 (1957) 201.Google Scholar
- 11.K. R. Linger, andD. G. Holloway,Phil. Mag. 18 (1968) 1269.Google Scholar
- 12.S. M. Wiederhorn,Mat. Sci. Res. 3 (1966) 503.Google Scholar
- 13.R. G. Hoagland,J. Basic Eng. ASME 89 (1967) 525.Google Scholar