Fracture toughness test
For fracture toughness test, four tests were performed, as summarized in Pipe Fracture Encyclopedia. In this
paper, one test was considered to analyze high strain rate effect. Fracture toughness test was performed at 288°C on CT specimens machined from full scale A106 Gr. B pipe. CT specimen having a full-thickness of 0.5T with a
detailed sizes of specimen is tabulated in Table 2. The specimens were oriented such that crack growth was in the
circumferential direction (L-C orientation). In dynamic fracture toughness test, the displacement rate was selected to
cause initiation in approximately 0.2 seconds.