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

摘要: Abstract 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 study the thermomechanical interactions related explosive initiation. Detailed observations processes governing generation heat these materials are severely lacking, yet they vital for identifying salient physics, improving modeling tools used predict response, safety, providing insight into initiation mechanisms explosion. Here we report on high-speed, high-resolution in-situ observations, obtained via synchrotron X-ray phase contrast imaging diffraction, heating decomposition an material under ultrasonic excitation. We demonstrate that interfacial friction is dominant mechanism lead violent reaction particles. Furthermore, sub-surface particle temperatures estimated diffraction.