Thesis
Shock compression response of polymethylpentene and aluminum single crystals
Washington State University
Master of Science (MS), Washington State University
12/2020
DOI:
https://doi.org/10.7273/000004208
Handle:
https://hdl.handle.net/2376/125020
Abstract
The shock compression response of two materials was examined in this work. Polymethylpentene (TPX) is a thermoplastic polymer that has the potential to be a useful window material for dynamic compression experiments. TPX can be used as a low-impedance optical and x-ray window due to its good transmittance in most parts of the electromagnetic spectrum, very low density (0.83 g/cm3), and low x-ray absorption. We present the results of dynamic compression experiments from 1 to 31 GPa to characterize the mechanical and optical response of TPX, determine the range of stresses over which TPX is transparent, and determine the window correction factor. The index of refraction was found to be essentially linear in density, resulting in a simple constant correction factor. TPX was found to remain largely transparent over the entire stress range examined. Aluminum single crystals were compressed in a series of plate impact experiments with stresses ranging from 13 to 92 GPa. Transmission and front surface impact experiments were used to shock compress the aluminum samples along the h111i crystal orientation. Velocity interferometry was used to measure particle velocity history and unloading wave profiles, from which the shock velocity, stress, and longitudinal sound speed were determined. The results of these experiments closely match previous studies on aluminum single crystals; the experiments at 80 and 92 GPa extend the results to higher stresses but display larger scatter.
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Details
- Title
- Shock compression response of polymethylpentene and aluminum single crystals
- Creators
- Lauren Barmore
- Contributors
- Yogendra M Gupta (Advisor) - Washington State University, Physics and Astronomy, Department of
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Identifiers
- 99900896437201842
- Language
- English
- Resource Type
- Thesis