2.1. Dynamic test result of A106 Gr. B
• Tensile properties
The tensile properties for A106 Gr. B were examined over a wide range of strain rates in an attempt to
characterize the strain rate effect. Tensile tests were conducted on flat, pin-loaded specimens having a width of
6.35mm, thickness of 3.18mm, and length of 25.4 in the gage section. The tensile axis of the specimen was parallel
with the pipe axis. Specific details of a tensile specimen is depicted in Fig. 1 (a). The tensile tests were conducted in
a servo-hydraulic machine at strain rates of 4 x 10-4/s, 3.4/s and 11.6/s. Strain was measured using an optical
extensometer which follows flags located at the opposite ends of the gage section. Table. 1 is a summary of the
tensile tests condition and results. Fig. 1 (b) shows engineering stress-strain curves for three tensile specimens tested
at 288°C at three different strain rate. At high strain rate, both the ultimate tensile strength and the fracture
elongation were significantly lower than for quasi-static testing rates.