Abstract

A reactive bridge of nanoscale Al/Ni multilayers, or nanolaminates, is a recent advance in microscale thin-film initiator systems, potentially improving performances of explosive initiator. This numerical study introduces a three-dimensional (3D) modeling of initiator with a reactive bridge for more realistic and accurate system prediction as compared with the existing one-dimensional (1D) approximation of thin-film initiator. The model gives transient simulations for the atomic species and thermal diffusion, as well as prediction of electric potential distribution and pulsed energy deposition in the platinum bridge film. The computational results show that 3D effects are substantial such locally concentrated bridge joule heating and reduced reaction sensitivity in bimetallic multilayers by lateral heat loss. The horizontal reaction wave propagation from corners of the nanolaminates is also examined, as it effectively invalidates the 1D model of uniform bridge heating and vertical reaction advances across bimetallic multilayers. Optimization of various system design parameters is also discussed in view of achievement of best initiator performances.

中文翻译：

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纳米级铝/镍多层薄膜反应桥集成微尺度起爆剂的数值模型与分析

摘要

纳米级 Al/Ni 多层或纳米层压板的反应桥是微米级薄膜引发剂系统的最新进展，可能会提高爆炸引发剂的性能。与现有的薄膜引发剂的一维 (1D) 近似相比，这项数值研究引入了具有反应桥的引发剂的三维 (3D) 建模，以实现更真实和准确的系统预测。该模型对原子种类和热扩散进行了瞬态模拟，并预测了铂桥膜中的电势分布和脉冲能量沉积。计算结果表明，3D 效应是显着的，例如局部集中的桥焦耳加热，并通过横向热损失降低了双金属多层中的反应灵敏度。还检查了纳米层压板角落的水平反应波传播，因为它有效地使均匀桥加热的一维模型和跨双金属多层的垂直反应进展无效。还讨论了各种系统设计参数的优化，以实现最佳引发剂性能。