Ayotomi Olokun¹, Bing Li¹, Chandra Prakash², Zhiwei Men³, Dana Dlott³, Vikas Tomar¹; ¹Purdue University, ²Johns Hopkins University, ³University of Illinois Urbana-Champaign

Energetic material (EM) with solid oxidizer material and polymeric binder can experience abrupt temperature rise or even explosion when exposed to dynamic impact due to its complex microstructure. Such unintended detonation could result in severe accidents. It has been noticed that there are hot-spots within the EM, which are prone to initiate the chemical reaction and detonation under dynamic loads. The behavior of hot-spots during detonation initiation under impact is influenced by the EM microstructure, including oxidizer particle size, volume fraction, etc. It is important to capture the local temperature rise and relate it with material microstructure during the detonation for improvement of safety management. Infrared imaging technique was employed in this work to provide visualization of temperature change during EM detonation, and high time and special resolution were both achieved. This related the behavior of hot-spots with material microstructure and the observation agreed well with existing numerical simulation work.