Products & Technology
Fatigue Resistant Steel Plates AFD™
Mechanism of suppression of fatigue crack propagation rate
Dispersion of hard phases in steel microstructure increases bending and branching of fatigue cracks.
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Bending and branching of fatigue cracks are increased by microstructure control to disperse fine hard phases.
Performance
Distribution of fatigue crack propagation rate
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In AFD steel, the fatigue crack propagation rate is reduced to 1/2 or less than the upper limit of ordinary steels by reducing the range of the stress intensity factor (K) around the crack tips.
Thin fatigue-resistant plate for steel structures, contributing to improved bridge safety
To improve the safety of bridges, JFE’s thin anti-fatigue damage steels (AFD steels) for steel structures reduces the fatigue crack propagation rate to 1/2 of the rate of ordinary steel plates.
Microstructure control of the steel is applied to the increase of branching and bending of fatigue cracks, suppressing the stress intensity factor (△K) at fatigue crack tip.
The fatigue resistance of members can be improved by applying AFD steels to members that are particularly susceptible to fatigue crack initiation.