Incipient and Developed Spall Fracture of Wedge Samples of U–1.5%Mo Alloy Loaded by Sliding and Normal Detonation of HE Layers Having Different Power and Thickness

摘要

Data on the setup and results of explosive experiments aimed to determine the spall strength of the cast alloy U–1.5%Mo with the varying amplitude and duration of the loading pulse are presented. Explosive loading conditions realized on wedge samples allowed both incipient, and developed spall fracture to occur in these samples. These loading conditions also allowed us (i) to register by optical lever method both elastic and plastic waves attenuation through the wedge thickness, and changes of the spall signal parameters; (ii) to recover samples after low-, and high-intensive explosive loading for their subsequent metallographic investigation; and (iii) to measure distribution of hardness H ν ( h ) and microhardness H μ ( h ) through the sample thickness. All experimental data obtained on the spall strength of alloy U–1.5%Mo are described by a single empirical dependence that relates the value of tensile stress in the spall plane with the stress gradient in the tensile wave and the amplitude of the shock-wave compression of the material prior to its tension.