2D- and 3D-explosive experiments for verification of spall and shear strength models for some steels

Abstract

The optical-lever method and laser interferometry were used to obtain new data on dynamic behavior of the hardened 30KhGSA steel (HRC 35…40) and the austenitic 12Kh18N10T steel under their explosive loading in 2D-and 3D-experimental setups. Investigation of the recovered wedge samples and the semispherical steel shells with the help of gamma-tomography and scanning electron microscopy elucidated special features in the high-rate deformation, as well as regularities in the evolution of deterministic perturbations. Systematic experimental data are essential for verification and certification of the multiphase equation of state and the modern kinetic strength models of these steels, which are used in the 2D-and 3D-software complexes.

Cumulation of a spherically converging shock wave in metals and its dependence on elastic-plastic properties, phase transitions, spall and shear fractures

“…. 1.0 GPa where the first value corresponds to the stress at the elastic precursor with the σ HEL ≈ 0.45 GPa amplitude [23][24][25] or Steel 3, 11 the quenched 30KhGSA steel, 26,27 and the same steel as received, 11 as well as for the 12Kh18N10T steel. 11,28 and the second value takes into account strain hardening in stress waves without influence of pressure and temperature); (ii) Iron and Steel 3 having polymorphous transitions and approximately the same (Y A ≈ 0.65 GPa) shear stresses; 23 Furthermore, metastability of the α -ε phase transition is noted to have a more pronounced character in the quenched 30KhGSA steel 26,27 as compared to that of iron [23][24][25] and this results in a more pronounced dissipation of energy in the loading-unloading cycle.…”