Abstract
Cracks in SM50A, steel for welding structure chilled at -40 to -160 C were loaded by various stress intensity pulses with durations of 20, 40, and 80 µs to generate experimental data of critical stress intensity levels for crack instability. Fracture surfaces were observed by a scanning electron microscope to examine cleavage nucleation origins ahead of the crack tips. The obtained experimental results were discussed from the minimum time criterion and the crack tip plasticity.
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