2026-09-22T23:56:30Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/121410 2023-12-13 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Glumac, Nick G Elliott, Gregory S 2023-08 application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms The student, Austin Lake Spradling, accepted the attached license on 2023-06-06 at 12:57. The student, Austin Lake Spradling, submitted this Thesis for approval on 2023-06-06 at 13:16. This Thesis was approved for publication on 2023-07-21 at 17:01. DSpace SAF Submission Ingestion Package generated from Vireo submission #19407 on 2023-12-04 at 16:59:52 Experiments of the natural fragmentation of explosively-driven metal hemispheres at the 100-gram scale Spradling, Austin Lake 2023-07-21 Natural Fragmentation Metal Hemisphere High Explosive Cased Charge Tantalum Gallium Indium Experimental To study the problem of natural fragmentation of hemispherical high-explosive metal casings, six exploratory experiments were performed at the 100-gram scale using gallium, indium, and tantalum shells with 1:1 and 2:1 explosive-to-shell mass ratios. For each test, soft catch devices were used to capture shell fragments in flight, and other post-test particulates were collected, sieved, and elementally analyzed. For gallium and indium shells, post-test particulate analyses indicate near complete, if not total, conversion to oxide. Preliminary tantalum results suggest that soft catch, particularly ballistic gelatin, along with particle analysis techniques X-ray fluorescence and X-ray diffraction are likely to be useful tools for quantifying its fragment size distribution in flight. Three new optical diagnostics - ratio pyrometry, flash radiography, and high-speed videography - have recently been implemented and show promising results for both qualitative understanding and quantitative measurement of the fragmentation process at early times. Additionally, a technique was developed for press forming a unique shell shape and mounting it in a way that better approximates a spherical system. Text eng https://hdl.handle.net/2142/121410 Copyright 2023 Austin Lake Spradling M.S. Thesis Aerospace Engineering University of Illinois at Urbana-Champaign Aerospace Engineering