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Abstract
Stress waves have been measured under shock wave loading of zirconium alloy E110 samples with the 0.5 – 8 mm thickness at normal and elevated temperatures. Duration of shock loading pulses varied from ∼0.05 up to 1μs with the amplitude varying from 3.4 up to 23 GPa. Free-surface velocity profiles have been registered using VISAR and PDV interferometers with nanosecond resolution. Attenuation of the elastic precursor has been measured to determine plastic strain rate behind the elastic precursor front. The plastic strain rate was observed to decrease with propagation from 10 6 s −1 at the 0.46-mm distance down to 2 ⋅ 10 4 s −1 at the 8-mm distance. Spall strength has been measured under normal and elevated temperatures. Spall strength versus strain rate relationships have been constructed in the 10 5 s −1 – 10 6 s −1 range. Under shock compression higher than 10.6 GPa, the three-wave configuration of the shock wave has been registered and the polymorphous α → ω transition is considered to be the reason of this phenomenon. This work was supported by State Atomic Energy Corporation “Rosatom” within State Contract # H.4x.44.90.13.1111
Highlights
Investigation into processes of elastic-viscous-plastic deformation of metals and alloys under shock-wave loading [1] allows us to measure velocity-temperature relationships how these materials resist to deformation and fracture
In order to estimate stresses arising in the samples, we used Hugoniot adiabat of zirconium D = 3.91 + 0.91u, where D – is shock wave velocity, u– is mass velocity [10] with a correction for sound velocity data obtained for alloy E110
Measured dependences of elastic precursor attenuation allowed us to estimate the plastic deformation rate that changes from 106 s1 at the 0.46-mm thickness of samples to 2 · 104 s−1 at the 8-mm thickness and this practically one order of magnitude higher than the plastic deformation rate in zirconium alloy E635, VT1-0 titanium and magnesium alloy Ma-2
Summary
Investigation into processes of elastic-viscous-plastic deformation of metals and alloys under shock-wave loading [1] allows us to measure velocity-temperature relationships how these materials resist to deformation and fracture. Shock-wave methods were used for [6,7,8,9] systematic investigations into the velocity-temperature relationships for yield stresses and fracture of pure metals with facecentered and body-centered cubic structures. These data are practically absent for metals with hexagonal closepacked structure
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