The deformation mechanism in pulse loading differs from all other types in static and dynamic loading and consists in the formation of a mosaic structure without plastic flow of the grains.
Plastic flow occurs during pulse loading when the movement of the piece is restrained or as the result of the interaction of structurally heterogeneous zones during pulse loading.
The hardening resulting from pulse loading exceeds that resulting from ordinary plastic deformation. The hardness is highest when a mosaic structure is formed and amounts to approximately 150–250% of the initial values.
The principal factors influencing the structure and properties of the material after pulse loading are the loading velocity and the shape of the sample.
At the critical percentage of mosaic structure, pores are formed. Fracture occurs when the propagation rate of the pores exceeds the rate at which the load is removed.
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Reinhardt and Pearson, Behavior of Metals in Pulse Loading [Russian translation], IL (1958).
N. S. Borovik, M. Sh. Mamedov, and V. V. Volotskaya, Fiz. Metal. i Metalloved.,19, No. 3 (1965).
Moscow Technological Institute of the Meat and Dairy Industry. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 75–76, April, 1969.
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Shishkova, A.P., Lapidus, A.M., Torgasheva, V.S. et al. Microstructure of iron and low-carbon steel after pulse loading. Met Sci Heat Treat 11, 325–326 (1969). https://doi.org/10.1007/BF00653209
- Plastic Deformation
- Propagation Rate
- Deformation Mechanism