Thermal-Mechanical Characterization of Bridgewires and Surrounding Materials Utilizing Thermal Transient Testing

摘要

An analytical approach is presented herein that characterizes material behavior in Electro-Explosive Devices (EEDs) by using Thermal Transient Test (TTT) data acquired from inert materials, properly bJended and pressed into NASA Standard Initiator (NSI) bodies with welded bridgewires. The inert materials were selected to envelope the material properties of conventionally loaded EED energetic materials, such as the zirconium potassium perchlorate blend (Zr/KCIO_4 or ZPP) used in the NSI. The testing and analysis methods presented to describe the thermal behavior of these materials can of course be applied to live EEDs, which is to be the follow-on to this initial effort. Characterization of internal EED thermal and material properties creates a safer use of TTT as a tool, enabling companies to select a current magnitude and duration to ensure the bridgewire-to-energetic material interface is not compromised.