Thermal Shock Behavior of Polymer Bonded Explosive below and above the Viscous Flow Transition Temperature. Issue 1 (March 2020)

• Record Type: Journal Article
• Authors: Tang, Mingfeng; Wang, Shengnan; Li, Ming
• Is Part Of: IOP conference series. Volume 774:Issue 1(2020)
• Publication Date: 2020-03
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/774/1/012044
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: The effect of initial cooling temperatures on the thermal shock behavior of cylindrical polymer bonded explosive (PBX) was investigated by using a combined acoustic emission (AE) and strain gauge technique in fast air-cooling tests. Dissimilarity was observed below and above the viscous flow temperature (Tf ) where the PBX exhibited brittle-ductile transition and temperature dependence on material properties. We found that cooling below Tf would lead to fracture with strong AE signals and a linear strain-time response followed by a sharply decline, while above Tf would generate weaker AE events and a non-linear strain history with soften response. A segmented characterization was proposed for the calculation of thermal shock resistance and the corresponding critical fracture temperature difference. This estimation fits well with our experimental and simulation results.