Importance of microstructural features in mechanical response of cast-cured HMX formulations 机翻标题: 暂无翻译,请尝试点击翻译按钮。

会议集名/来源
Shock Compression of Condensed Matter - 2017, Part A: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter.St. Louis, MO(US).9-14 July 2017
出版年
2018
页码
070033-1-070033-6
会议地点
St. Louis, MO
作者单位
High Explosives Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USAHigh Explosives Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USAHigh Explosives Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USAFluid Dynamics and Solid Mechanics, Los Alamos National Laboratory, Los Alamos, NM 87545, USAHigh Explosives Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USAFluid Dynamics and Solid Mechanics, Los Alamos National Laboratory, Los Alamos, NM 87545, USAMaterials Science in Radiation and Dynamics Extremes, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
作者
John D. Yeager;Virginia W. Manner;Jamie A. Stull;David J. Walters;Andrew M. Schmalzer;Darby J. Luscher;Brian M. Patterson
摘要
Cast-cure formulations of plastic-bonded explosives (PBX) present some advantages in manufacturing and application compared to traditional pressed slurry formulated materials. For example, these formulations can be cast to specific shapes and then cured in place, avoiding the need for machining precision parts. However, the microstructure of these materials can be greatly affected by the specific manufacturing process. Here, we evaluate the effect of minor changes to the formulation and manufacturing process on several cyclotetramethylene-tetranitramine (HMX) PBXs. The binders were based on hydroxyl-terminated polybutadiene (HTPB) and cast-cured using diphenylmethane diisocyanate (isonate) as a curing agent. We examined the materials using X-ray computed tomography (CT) imaging and uniaxial compression testing. The isonate content was found to significantly affect the modulus and strength of the binder. The presence of significant void content could be controlled by adding a centrifuging step during the curing process, but the resulting effect on mechanical properties was relatively minor. Mesoscale simulations showed that differences in the mechanical strength of the binder were not sufficient to describe the differences observed in mechanical testing, indicating that the HMX-binder adhesion was also being changed by the manufacturing process.
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