Abstract
The technique of warm-prestressing to improve the resistance of structural steel with defects against low temperature fracture has received considerable attention. It is found that warm-prestressing can improve the fracture toughness and change the COD or δ c, especially the crack tip plastic opening δ p. The experimental results obtained from three-point bending tests of 42Mn2 steel specimens at −60°C and −20°C are analyzed. Experiments are also made on the bursting of pressure vessels manufactured from #20 steel. The results indicate that warm-prestressing at room temperature increased the bursting pressure at −40°C for d/ t = 0.2 to 0.4, where d is the depth of surface crack and t the vessel thickness.
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