Abstract
We investigated the dynamic fragmentation of laser shock-loaded tin to gain insights on the underlying mechanism of this process. In the experiments, tin samples were shock-loaded by nanosecond laser over sequential pressures ranging from 7 GPa to 43 GPa. Integrated diagnostic techniques, including four-frame optical transverse shadowgraph imaging system, soft recovery, and photonic Doppler velocimetry (PDV), were employed. They provide the shape of the ejecta in the dynamic fragmentation process, the recovered ejecta, as well as the loading parameters. These experimental results were compared with those obtained using one-dimensional Lagrangian hydrodynamics simulation. The crossed results over sequential pressures allowed us to gain better insights on the different dynamic fragmentation processes of spall fracture and micro-spalling, which can help develop reliable models for dynamic fragmentation of triangular-wave shocking metals.
Highlights
When shock wave passes through a sample-vacuum interface, the interaction between release wave and reflected rarefaction wave may cause the well-known dynamic fragmentation, spall fracture
This study aims to explore the dynamic fragmentation characterization of tin sample at different scitation.org/journal/adv phases with the integrated diagnostic techniques, including four frames imaging system, soft recovery and photonic Doppler velocimetry (PDV)
The successive shadowgraphs show that the response of ejecta varies with the loading pressure
Summary
When shock wave passes through a sample-vacuum interface, the interaction between release wave and reflected rarefaction wave may cause the well-known dynamic fragmentation, spall fracture. This process is accompanied with the nucleation, growth, and coalescence of voids or cracks, which leads to the ejection of one or several layers from the free surface. When shock wave passes through a sample-vacuum interface, the interaction between release wave and reflected rarefaction wave may cause the well-known dynamic fragmentation, spall fracture.. When shock wave passes through a sample-vacuum interface, the interaction between release wave and reflected rarefaction wave may cause the well-known dynamic fragmentation, spall fracture.1–5 This process is accompanied with the nucleation, growth, and coalescence of voids or cracks, which leads to the ejection of one or several layers from the free surface. When the shock wave is strong enough such that the sample is melted on compression or release, a cloud of fine droplets is emitted Dalton et al. compared the spall strength of single crystal aluminum with high purity, single crystal aluminum alloy of the 1100 series, and aluminum-magnesium alloy with different average grain sizes. Researchers at Los Alamos National Laboratory reported that the quantity and distribution of ejected fragments were mainly reliant on the material phase at shock release
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
