Stress dependence of elastic-wave attenuation in LiF

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Abstract
Shock‐wave propagation studies along the 〈100〉 direction in LiF single crystals are presented for three elastic impact stresses, namely, 39, 29, and 15 kbar. Present results demonstrate a stress threshold for a large increase in plastic strain rate and establish stress relaxation as a bulk property. Analysis of the data reveals a one‐to‐one correspondence between plastic strain rate and stress at the elastic‐shock front. This is in agreement with the constitutive relation generally used for stress‐relaxing solids under plate‐impact loading.