The effect of low temperatures on the fatigue crack growth of S460 structural steel
article
The Fatigue Ductile–Brittle Transition (FDBT) is a phenomenon similar to the fracture ductile to brittle
transition, in which the fracture mode of the fatigue cracks changes from ductile transgranular to cleavage
and/or grain boundary separation. Fatigue at temperatures below the FDBT has a much different
crack growth rate than fatigue above that temperature. In an attempt to give practical guidance as to
whether or not the FDBT is relevant for design, this paper compares a FDBT curve to the much more common
Charpy and CTOD transition curves for an S460 structural steel. The data in this paper suggests that
choosing a steel with a Charpy energy in Joules greater than 10% of its yield strength in MPa at the design
temperature may not be adequate to assure that a fatigue ductile to brittle transition does not occur in
service conditions
transition, in which the fracture mode of the fatigue cracks changes from ductile transgranular to cleavage
and/or grain boundary separation. Fatigue at temperatures below the FDBT has a much different
crack growth rate than fatigue above that temperature. In an attempt to give practical guidance as to
whether or not the FDBT is relevant for design, this paper compares a FDBT curve to the much more common
Charpy and CTOD transition curves for an S460 structural steel. The data in this paper suggests that
choosing a steel with a Charpy energy in Joules greater than 10% of its yield strength in MPa at the design
temperature may not be adequate to assure that a fatigue ductile to brittle transition does not occur in
service conditions
TNO Identifier
528694
Source
International Journal of Fatigue, 82, pp. 110-118.
Pages
110-118
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