Influence of temperature on fatigue behavior of poly-6-caprolactam

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Abstract
The influence of elevated temperature on the fatigue behavior of poly-6-caprolactam has been studied. The fatigue behavior is influenced by internal damping. Wohler's curves measured at elevated temperatures correspond to the conditions of kinetic fluctuation theory. If the specimen is fatigued at low stresses and at temperatures lying sufficiently below the glass transition temperature of the amorphous phase of this polymer, the mechanism of fatigue fracture is different from that at elevated temperatures. The apparent activation energy of fatigue failure at temperatures higher than Tg was calculated. If the specimen is fatigued at elevated temperatures and its lifetime is long enough the monoclinic α-form crystal lattice of the crystalline portion is transformed to the hexagonal γ form.

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