Numéro
J. Phys. IV France
Volume 10, Numéro PR9, September 2000
EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) Pr9-647 - Pr9-651
DOI https://doi.org/10.1051/jp4:20009108
EURODYMAT 2000 - 6th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 10 (2000) Pr9-647-Pr9-651

DOI: 10.1051/jp4:20009108

Dynamic hardness of high-strength steel and titanium alloy

G. Stepanov and V. Zubov

Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev, Ukraine


Abstract
Essential results of experimental studies on dynamic hardness (an average pressure on the cone face of a rigid rod at its impact indentation into the surface layer of a thick plate) of a homogeneous rolled steel (HRA) and a titanium alloy are presented in this paper. Significant influence of the impact velocity on dynamic hardness of materials tested follows from the analysis of the experimental data. Specific energy of the formation of a conical cavity (per unit volume of displaced material) decreases with an increase in the indentation velocity and the conical cavity depth. At further process of indentation, corresponding to the initial stage of penetration (the cavity depth exceeds the length of the rod conical head) the average pressure increases with the impact velocity. Combined influence of viscosity effect and rise in temperature at plastic flow should be taken into account in order to explain the above relations.



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