In-situ X-ray observations of ultrasound-induced explosive decomposition

Journal Article · Wed Mar 13 04:00:00 EDT 2019 · Applied Materials Today

DOI:https://doi.org/10.1016/j.apmt.2019.01.009· OSTI ID:1607857

Mares, Jesus O. ^[1]; Roberts, Zane A. ^[1]; Emre Gunduz, I. ^[2]; Parab, Niranjan D. ^[1]; Sun, Tao ^[3]; Fezzaa, Kamel ^[3]; Chen, Weinong W. ^[1]; Son, Steven F. ^[1]; Rhoads, Jeffrey F. ^[1]

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1. Purdue Univ., West Lafayette, IN (United States)
2. Purdue Univ., West Lafayette, IN (United States); Naval Postgraduate School, Monterey, CA (United States)
3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

High-strain mechanical loading of polymer-bonded explosives can produce significant stress concentrations due to microstructural heterogeneities, resulting in localized thermal “hot spots”. Ultrasound produces similar effects and has been proposed as a tool to study the thermomechanical interactions related to explosive initiation. Detailed observations of the processes governing the generation of heat in these materials are severely lacking, yet they are vital for identifying salient physics, improving the modeling tools used to predict mechanical response, improving explosives safety, and providing insight into the initiation mechanisms of explosion. Here we discuss high-speed, high-resolution in-situ observations, obtained via synchrotron X-ray phase contrast imaging and diffraction, of the heating and decomposition of an explosive material under ultrasonic excitation. We demonstrate that interfacial friction is a dominant heating mechanism and can yield violent reaction of explosive particles. Moreover, sub-surface particle temperatures are estimated via diffraction.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; Office of Naval Research (ONR); Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1607857
• Journal Information: Applied Materials Today, Journal Name: Applied Materials Today Journal Issue: C Vol. 15; ISSN 2352-9407
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Diffraction
Explosive decomposition
Hot spot
Polymer-bonded explosive
Ultrasound
X-ray phase contrast imaging