New data on the kinetics and governing factors of the spall fracture of metalsстатья
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Местоположение издательства:[Bristol, UK], England
Первая страница:012039
Последняя страница:012039
Аннотация:In studies of the spall strength of metals, its dependences on the strain rate and in some cases on the peak shock pressure are usually determined. As a result of constrained fracture rate the spall strength value grows with increasing the rate of loading. Concerning the peak stress in preceding shock wave, it was reported about both independence of the spall strength of the peak stress and about growth of the spall strength with increasing the peak shock stress. In our talk we shall present two examples of significant departures from these trends. In experiments with vanadium single crystals we observed essential decrease of the spall strength with increasing the shock stress that was interpreted in terms of disruption of the matter homogeneity as a result of its twinning at shock compression. In the experiments with 12Kh18N10T austenitic stainless steel we observed sharp increase of recorded spall strength value when short load pulses of a triangular profile were replaced by shock pulses of long duration having trapezoidal shape. This anomaly is associated with formation of the deformation-induced martensitic phase which increases the yield stress in the vicinity of growing pores. Depending on the strain rate, the effect emerges in different stages of the spall fracture.