The fracture energy of some epoxy resin materials
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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.
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