Abstract
In this paper the connection between the speed of ductile-crack propagation and the dynamic-flow properties of metals is examined. A theoretical analysis based on a dynamic solution for the Dugdale crack model and employing descriptions of 1) the strains within the plastic zone, 2) the rate dependence of the flow stress, and 3) a simple criterion for ductile fracture is developed. The calculations are found to compare favorably with observed crack speeds of 1.6 to 410 ft/sec in 0.00175-in.-thick steel foil. It is concluded that ductile-crack speed is limited by the increased resistance to plastic flow at high strain rates. The key factors determined in the analysis are used to show that flow stress data for strain rates exceeding 104 sec−1 can be extracted from ductile-crackpropagation experiments.
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Kanninen, M.F., Mukherjee, A.K., Rosenfield, A.R., Hahn, G.T. (1968). The Speed of Ductile-Crack Propagation and the Dynamics of Flow in Metals. 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_6
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DOI: https://doi.org/10.1007/978-3-642-87445-1_6
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