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Statistical scatter of fracture toughness in the ductile–brittle transition of a structural steel

✍ Scribed by Tetsuya Tagawa; Yoichi Kayamori; Hirohito Hira

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
764 KB
Volume
77
Category
Article
ISSN
0013-7944

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✦ Synopsis

The statistical scatter of fracture toughness in the ductile-brittle transition temperature range was experimentally examined on a 500 MPa class low carbon steel. Fracture toughness tests were replicatedly performed at À60 °C, À20 °C and À10 °C. The tests at À60 °C resulted in a single modal Weibull distribution with a shape parameter of 4 for the critical stress intensity factor converted from J-integral, whereas the Weibull distributions of the critical stress intensity factor at À20 °C and À10 °C showed a bilinear pattern with an elbow point, which caused a wider scatter than that at À60 °C. Such scatter transition behavior was discussed with reference to stable crack initiation. A model of the statistical scatter transition has been proposed in this work and the model reasonably explains the experimental results.

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