In-situ thermal analysis of intermetallic and thermite projectiles in high velocity impact experiments

Woodruff, Connor; Dean, Steven W.; Cagle, Colton; Croessmann, Charles Luke; Dubé, Pascal; Pantoya, Michelle L.

doi:10.1016/j.ijheatmasstransfer.2022.122565

In-situ thermal analysis of intermetallic and thermite projectiles in high velocity impact experiments

Journal Article · Tue Jan 18 00:00:00 EST 2022 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2022.122565· OSTI ID:1841995

Woodruff, Connor ^[1]; Dean, Steven W. ^[2]; Cagle, Colton ^[1]; Croessmann, Charles Luke ^[1]; Dubé, Pascal ^[3]; Pantoya, Michelle L. ^[1]

Texas Tech Univ., Lubbock, TX (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
MATSYS, Inc., Sterling, VA (United States)

Particle fragmentation influences thermochemical energy conversion processes in different ways and is of significance in energy generation technologies. Different reactive material formulations trigger varied thermal response in extreme environments such as high velocity impact. Here we investigated optical thermal response of powder gun launched intermetallic (Al:Zr) and thermite (Al:MoO₃) projectiles using pyrometry and thermography. Projectiles were launched at 1250 m/s into an air-filled chamber and impacted a steel witness plate to create a dust explosion. The pyrometer was configured to measure temperatures directly at the point of impact, while the thermographic system measured temperatures throughout the explosion chamber. Results show that impact temperatures ranged between 3500 and 4000 K, but that the dynamics of energy conversion were different for the intermetallic and thermite projectiles. The intermetallic exhibited secondary reactions due to fragmented debris impacting the walls of the chamber. The thermite exhibited greater gas generation, propelling the debris field, and producing a more stochastic response with faster spreading and dissipation of thermal energy. Unique features such as microexplosions within fragmented particles were also analyzed. While both reactive materials produce similar temperatures, their mechanisms of energy conversion and release are different, indicating the potential of these materials for different ballistic applications.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525; NA0003988

OSTI ID:: 1841995

Alternate ID(s):: OSTI ID: 1840797

Report Number(s):: SAND--2022-0704J; 702942

Journal Information:: International Journal of Heat and Mass Transfer, Journal Name: International Journal of Heat and Mass Transfer Vol. 187; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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