Strength of Some Grades of Steel and Armco Iron under Shock Compression and Rarefaction at Pressures of 2-200 GPa

摘要

This paper reports results from a comparative experimental study of the dynamic strength of St.20 and 09G2S steels(which are of interest as structural materials for the load-bearing casings of explosion-proof chambers)under shock compression and tension(spalling)at shock-front pressures of 1-5 GPa and strain rates of 10~3-10~4 sec~(-1).A comparative analysis is performed of the obtained and available data on the dynamic yield point and spall strength of St.3,St.20,09G2S,12Khl8N10T,EI712,30KhGSA,36NKhTYu,KhVG,and 35Kh3NM steels and armco iron,whose strengths and ductilities under static loading conditions differ by a factor of up to five.Experiments are described in which spheres of St.3,St.20,12Khl8N10T,and SOKhGSA steels with markedly different strengths and ductilities are loaded by a convergent quasispherical shock wave with a pressure at the center of 200 GPa and a strain rate of 10~5 sec~(-1).