Fracture tests for both SENB and DCB specimens were performed
at different temperatures from 80 C to 50 C, on an
Instron 5567 machine inside an environmental chamber. The crosshead
speed was 1.0 mm/min for all tests. At 20 C and lower temperature,
the SENB specimens were designed with dimensions of
span (4S ¼ 50 mm), width (W ¼ 12.5 mm) and thickness
(B ¼ 5.5 mm), and at 50 C, specimen thickness B was increased to
6.3 mm. At least 4 samples were tested for each condition. For SENB
tests, KIC can be determined