Abstract
This study is devoted to the high-energy X-ray radiography investigation on the ejecta physics of laser shock-loaded tin. The ejecta were generated via laser shock loaded tin under sequential shock-breakout pressures by high-power nanosecond lasers. A high-energy X-ray (50∼200keV) source was created to radiograph the high dense ejecta. Due to its strong penetration, high-quality radiograph images were obtained with detailed inner information and topology structure of ejecta. The areal density distribution and total mass of ejecta were further inferred. It was found that the ejecta from laser shock-loaded tin under sequential pressures show obvious difference in density distribution between the samples in a solid state and in a melt-on-release state. In addition, the total mass of ejecta was demonstrated to increase sharply when the breakout pressure is larger than the onset of melt-on-release for tin. Such increase inferred a solid-liquid phase transition of ejecta production mechanism.
Highlights
When a strong compressive pulse reflects from the free surface of metal, a dynamic fragmentation process is expected to take place, and may form many types of ejecta production
Tin sample should be in solid state near its free surface in the first simulation (PSB =14.6GPa), while melting is expected to occur on release within the tin sample in the second simulation (PSB =37GPa)
It indicates that the high dense shell of ejecta has been produced both for spall and microspall process, which has not been evidenced in shadowgraphy or soft recovery experiments
Summary
When a strong compressive pulse reflects from the free surface of metal, a dynamic fragmentation process is expected to take place, and may form many types of ejecta production. Sorenson et al. carried out the ejecta experiment in explosive-driven system and measured the ejected particle size distributions for shock loaded tin and Al samples using an in-line Fraunhofer holography technique They found that the measured particle size distribution exhibits a power law and groove angles of the 60○ and 120○ can cause dramatically different Al particle-size distribution. Ren addressed the influence shockwave profile on the ejection process from shocked Pb metal using MD simulation, and found that the total ejecta mass for supported shocks is less than that for unsupported shocks at the same breakout pressure, as the larger velocity difference between the jet tip and its bottom for unsupported shock generating more serious damage. Ren et al. examined the relation between ejecta production and shock-breakout pressure for single crystal Pb subjected to a decaying shockwave loading Their simulation found that the amount of ejecta increased significantly after melting on release or shock. Their studies found that the distribution of void nucleation sites and thermal dissipation behavior in microspalling were quite different from that in classical spalling
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