Resistance to high-rate deformation and fracture of lead at normal and elevated temperatures in the sub-microsecond time range

Abstract

Using measurements of the evolution of shock compression pulses and the rise time of plastic shock waves, the dependences of the yield stress and dynamic tensile strength (spall strength) of lead were determined depending on the strain rate in a range of 104 to 107 s−1 at room temperature and at 280–310 °C. Similar to other metals with a face-centered cubic structure, the dynamic yield stress of lead under these conditions increased abnormally as the temperature increased. At room temperature, the plastic strain rate in the shock wave did not significantly differ from the initial rate in the elastic precursor wave at the same value of the shear stress, but significantly exceeded it at 280 °C.