Abstract
The dynamic fracture toughness values of glass mat reinforced polyester laminates were compared with the analytical values of dynamic stress intensity factor, and their temperature dependence was discussed using instrumented Charpy test results. The results obtained are as follows:(1) The ratio of dynamic fracture toughness KId to the static one KIS, which was obtained by the finite element method, decreased with time by oscillating around one, when the load increased at a constant rate. The ratio of KId/KIS was between 0.99 and 1.1, when the loading speed was about 0.55kgf/μs and KIS was greater than 30kgf/mm3/2 for EW test specimens, and when the speed was about 0.35kgf/μs and KIS was greater than 20kgf/mm3/2 for FW test specimens. The difference between the dynamic fracture toughness values obtained by the static K-calibration using the maximum load and by the dynamic K-calibration was smaller than the variation of measured values.(2) The dynamic fracture toughness values of EW specimens decreased slowly as the temperature became higher, while those of FW specimens were about constant at temperatures below 60°C. The toughness values of both specimens decreased rapidly as the temperature became higher than the thermal deformation temperature of resin (about 90°C). This temperature dependence of toughness was different from that of specific absorbed energy.
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