Evolution of Size Distribution of Pores in Metal Melts at Tension with High Strain Rates

P Mayer and A Mayer, PROCEEDINGS OF THE FIRST INTERNATIONAL CONFERENCE ON THEORETICAL, APPLIED AND EXPERIMENTAL MECHANICS, 5, 211-214 (2019).

DOI: 10.1007/978-3-319-91989-8_46

Interest to mechanical behavior of metal melts is associated with both the development of experimental technique and the possible technological applications. One of the essential properties is the dynamic tensile strength of melts, that is, the level of negative pressure, which leads to cavitations and further fracture of the melt. The tensile state of melt is metastable, like for solid. Molecular dynamic (MD) simulations show that the complete fragmentation of melt occurs when the pore volume fraction reaches 80% or more. The work done by the negative pressure maintained in the melt at the stage of bubbly liquid can exceed the work to reach the cavitations limit due to the longer exposure time. In this paper we investigate with the help of MD the late stages of melt fracture with special attention to the study of the character of the size distribution of cavities and its evolution during tension.

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