Abstract
Cracks in SM50A, steel for welding structure chilled to -40 and -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 dislocation dynamics.
The critical stress intensity obtained by the minimum time criterion was decreased as the temperature was lowered, while the minimum time had the maximum at -80 C. The cleavage nucleation origin approached the crack tip as the temperature decreased. Finally, the temperature dependence of the minimum time was interpreted by the dislocation dynamics.
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© 1991 Elsevier Science Publishers Ltd
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Homma, H., Kanto, Y., Tanaka, K. (1991). Cleavage Fracture in Steel Specimens Under Short Stress Pulse Loading. In: Rossmanith, H.P., Rosakis, A.J. (eds) Dynamic Failure of Materials. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3652-5_2
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DOI: https://doi.org/10.1007/978-94-011-3652-5_2
Publisher Name: Springer, Dordrecht
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