Crack-resistance and spall strength of cerium under dynamic loading.

There is poor knowledge on cerium characteristics under dynamic loading, such as dynamic crack-resistance and spall strength, which are important for some applications. For example, material crack-resistance is one of parameters of the model, which is used for numerical description of the dispersion process [1]. Tests were performed for determination of dynamic crack-resistance by the split Hopkinson pressure bar method. However, significant plasticity of cerium caused failure of crack-resistance determination. Therefore crack-resistance evaluation was performed by study of material spall strength $\sigma_{0}$. Considering value $\sigma_{0}$, it is possible to determine specific work for material break $\lambda $ [2], and, basing on it, then it is possible to determine crack-resistance value by the Irvine-Griffiths criterion. \newline \newline [1] A.K.Zhiembetov, G.S.Smirnov, A.L.Mikhaylov et al. Cavitational method for determination of parameters of melting of shock-compressed substances at volume expansion. Chemical Physics, 2005, v.24, {\#}10, p.57-65. \newline [2] Fracture of different-scale objects. Edited by A.G.Ivanov, RFNC-VNIIEF, Sarov, 2001.