Abstract
Although the stress intensity around a crack is continuously varying in the elastic singularity, in real metals the pattern breaks down at the tip across discretely sized regions of stress relaxation. Within these regions, conditions of stress, strain, and strain rate can be characterized as uniform and equal to the point value in the singularity at the distance equal to the region size. High strain rate within this zone can be attained by crack movement, or by rapid loading of a stationary crack. Fracture strength is largely governed by the triaxial plastic stability and size of these regions. Determinations of plastic stability from dynamic compression tests correspond nicely to speed variations and temperature-wise trends in fracture strength in two ferritic steels.
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Krafft, J.M. (1968). Dynamic Mechanical Behavior of Metal at the Tip of a Plane Strain Crack. In: Lindholm, U.S. (eds) Mechanical Behavior of Materials under Dynamic Loads. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87445-1_7
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DOI: https://doi.org/10.1007/978-3-642-87445-1_7
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