Abstract
The effect of impact-modifier concentration and particle size on the fatigue resistance of an amorphous thermoplastic copolyester of dimethyl terephthalate with ethylene glycol and 1,4-cyclohexanedimethanol (KODAR®* PETG) was determined. Fatigue crack propagation (FCP) rate at a given value of stress intensity factor range, ΔK, decreased by a factor of four with the addition of an impact modifier, if the inherent viscosity of the PETG remained constant. The FCP rate did not vary with modifier concentration or particle size. However, the value of ΔK at instability did increase with increasing modifier content and particle size appeared to alter the FCP mechanism. in fatigue tests on unnotched specimens, neat PETG was more fatigue resistant than the impact-modified blends, suggesting that the modifier particles reduced the number of cycles required to initiate a crack.
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