T ( ) ( ) Bar Specimen A t t A (7) In all the tests, the loading rate is defined by: IC I c K K t (8) where IC K is critical stress intensity factor and ct is time interval from the start of loading to when the crack starts to propagate. A typical load-time curve recorded by the Instron machine for a CT specimen is shown in figure 5. Figure 5 Load-time curve of a R6 CT specimen under a crosshead rate of 100 mm/min Figure 6 Toughness-time and strain signal-time curves of R6 from SHTB test
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