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Shock induced chemical reactions in energetic structural materials.

机译：冲击在高能结构材料中引起的化学反应。

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摘要

Energetic structural materials (ESMs) constitute a new class of materials that provide dual functions of strength and energetic characteristics. ESMs are typically composed of micron-scale or nano-scale intermetallic mixtures or mixtures of metals and metal oxides, polymer binders, and structural reinforcements. Voids are included to produce a composite with favorable chemical reaction characteristics.;In this thesis, a continuum approach is used to simulate gas-gun or explosive loading experiments where a strong shock is induced in the ESM by an impacting plate. Algorithms are developed to obtain equations of state of mixtures. It is usually assumed that the shock loading increases the energy of the ESM and causes the ESM to reach the transition state. It is also assumed that the activation energy needed to reach the transition state is a function of the temperature of the mixture. In this thesis, it is proposed that the activation energy is a function of temperature and the stress state of the mixture. The incorporation of such an activation energy is selected in this thesis. Then, a multi-scale chemical reaction model for a heterogeneous mixture is introduced. This model incorporates reaction initiation, propagation, and extent of completed reaction in spatially heterogeneous distributions of reactants. A new model is proposed for the pore collapse of mixtures. This model is formulated by modifying the Carol, Holt, and Nesterenko spherically symmetric model to include mixtures and compressibility effects.;Uncertainties in the model result from assumptions in formulating the models for continuum relationships and chemical reactions in mixtures that are distributed heterogeneously in space and in numerical integration of the resulting equations. It is important to quantify these uncertainties. In this thesis, such an uncertainty quantification is investigated by systematically identifying the physical processes that occur during shock compression of ESMs which are then used to construct a hierarchical framework for uncertainty quantification.
机译：高能结构材料（ESM）构成了一类新型材料，可提供强度和高能特性的双重功能。 ESM通常由微米级或纳米级金属间化合物或金属与金属氧化物的混合物，聚合物粘合剂和结构增强材料组成。包括空洞以产生具有良好化学反应特性的复合材料。;本文采用连续介质方法来模拟气枪或爆炸载荷实验，其中冲击板在ESM中引起强烈冲击。开发了获得混合物状态方程的算法。通常假设冲击载荷会增加ESM的能量，并使ESM达到过渡状态。还假设达到过渡状态所需的活化能是混合物温度的函数。本文提出活化能是温度和混合物应力状态的函数。本文选择了掺入这种活化能的方法。然后，引入了多相混合物的多尺度化学反应模型。该模型在反应物的空间异质分布中合并了反应的引发，传播和完成反应的程度。提出了一种新的混合物孔隙塌陷模型。该模型是通过修改Carol，Holt和Nesterenko的球对称模型以包含混合物和可压缩性效应而形成的;模型的不确定性是由于在为空间和空间上异质分布的混合物建立连续关系和化学反应模型时所做出的假设所致。对所得方程进行数值积分。量化这些不确定性很重要。本文通过系统地识别ESM冲击压缩过程中发生的物理过程来研究这种不确定性量化，然后将其用于构建不确定性量化的分层框架。

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  • 作者

    Reding, Derek J.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 294 p.
  • 总页数 294
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:38:24

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