Instrumented drop-weight impact tests were conducted for injection-molded short glass fiber reinforced nylon-6 thermoplastic composites. The effects of fiber surface treatments, specimen temperatures and water contents on the impact fracture properties were studied. The first peak load P, or the corresponding absorbed energy E1 was found an appropriate parameter to evaluate the first cracking on specimen surfaces and also to compare the impact performance of thermoplastic composites. The effects of specimen temperatures and drying conditions were also found important in evaluating these materials. Microscopic observations revealed the microfracture mechanisms to explain the above macroscopic mechanical results. Static in-plane fracture toughness properties corresponded well with the impact properties.
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Takeda et al. (1996) studied this question.
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