Examination of fracture surfaces in A 302B 1T-CT specimens used to develop J(∆a) curves at 200 and 288°C has allowed evidence to be obtained on: (a) the micromechanism of crack extension in the upper shelf, and (b) the origin of load instabilities present at 288°C in all the specimens beyond the maximum load and of a ‘pop-in’ found in a specimen tested at 200°C.
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