The sensitivity of PBX 9501 and PBX 9502 to milling and sawing

dc.contributor.committeeChairNeuber, Andreas
dc.contributor.committeeMemberStephens, Jacob
dc.creatorWilliams, Joshua
dc.date.accessioned2022-06-06T14:54:16Z
dc.date.available2022-06-06T14:54:16Z
dc.date.created2022-05
dc.date.issued2022-05
dc.date.submittedMay 2022
dc.date.updated2022-06-06T14:54:17Z
dc.description.abstractExplosive driven pulsed power research benefits from modern polymer-bonded high explosives (HE). In practical application, high precision in the dimensional shape is required, and high machining speeds are desired. The limits of machining speed, driven mainly by the thermal response of the energetic material, are investigated. Specifically, the thermal response of PBX 9501 (95% HMX, 2.5% Estane, 2.5% BDNPA-F) and PBX 9502 (95% TATB, 5% Kel F-800) under conventional milling and sawing methods is examined. The presented work focuses on face milling performed with dry machining on a CNC, remote-controlled milling machine. The primary parameters of interest are the spindle speed (RPM), feed rate (IPM), step size (% dia.), depth of cut (inches), and endmill diameter (inches). The temperature of the system is monitored via high-speed infrared (IR) videography and near the cutting interface with a K-type thermocouple inserted into the endmill’s through-coolant channel. Operational forces and torques are recorded by a 6-axis force sensor mounted beneath the HE samples. An experimental setup for sawing into PBX is also presented. A dual-column horizontal band saw has been modified for remote control operations. Similar to the milling setup, the temperature of the system is measured using a high-speed IR camera and K-type thermocouples. Forces and torques are measured using a 6-axis force sensor mounted beneath the HE samples, with a fixed rail mounted in between the HE and the force sensor to allow the cutting “slice” thickness to be adjusted with each test. An empirical relationship between temperature and the milling parameters is presented. Overall, milling regimes exist outside of DOE-STD-1212-2019 for which milling temperatures remain well below the HE critical temperatures.
dc.description.abstractEmbargo status: Restricted until 06/2172. To request the author grant access, click on the PDF link to the left.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2346/89480
dc.language.isoeng
dc.rights.availabilityRestricted until 06/2172.
dc.subjectMachining
dc.subjectHigh Explosives
dc.subjectPBX
dc.subjectMilling
dc.subjectSawing
dc.titleThe sensitivity of PBX 9501 and PBX 9502 to milling and sawing
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorTexas Tech University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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