Brittle crack-arrest fracture toughness (KIa) was determined as a function of the temperature in a large-scale (1 x 1 m) 50-mm thick steel base metal and its high heat-input (32 kJ/mm) weld. An impact initiates crack propagation from a notch at low temperature toward a higher temperature region where the crack stopped due to the improved fracture toughness. The relationship between the toughness and crack-arrest temperature provides the KIa at −10 °C of about 100 MPa√m in the weld specimen, which is a significant decrease compared to that of the base metal (240 MPa√m). Furthermore, the path of the crack propagation was discussed in terms of the grain size, hardness, and Charpy impact energy of the localized crack region.
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An, G.B., Woo, W. & Park, J. Brittle crack-arrest fracture toughness in a high heat-input thick steel weld. Int J Fract 185, 179–185 (2014) doi:10.1007/s10704-013-9900-x
- Brittle fracture
- crack arrest
- thick steel