ABSTRACT The polymer-bonded explosive (PBX) is a kind of multi-phase composite consisting of the polymeric binder and embedded energetic particles, in which the particle volume fraction (PVF) is often higher than 90%. In the present work, by using the Voronoi-polygon generation method along with the concept of gradation to generate Voronoi particles with given gradation, and with further operations including modification, shrinking, smoothing, etc. to the particles, a new meso-structure construction method for PBXs is proposed. The constructed meso-structures possess good gradation relationship and have high PVFs (94.99% in maximum) simultaneously. The strict periodicity on the boundaries of the meso-structure can also be achieved. To verify the constructed PBX meso-structures, the numerical manifold method (NMM) is used to simulate the effective modulus of the constructed meso-structures by considering different influencing factors such as the size of meso-structure, PVF, gradation, and initial defects, etc. The simulation results are analyzed qualitatively, and the causes of differences between the simulation results and available experimental results or other numerical results are discussed. The validity of the proposed method for the construction of PBX meso-structures is verified. This work also provides foundations for the further numerical studies of the mechanical and thermal behaviors of PBXs at the mesoscale.

中文翻译：

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PBX的细观结构构建和有效模量模拟

摘要 聚合物粘结炸药（PBX）是一种由聚合物粘结剂和嵌入的高能粒子组成的多相复合材料，其中粒子体积分数（PVF）通常高于 90%。在目前的工作中，通过使用Voronoi-polygon生成方法以及渐变的概念来生成具有给定渐变的Voronoi粒子，并进一步对粒子进行修改、收缩、平滑等操作，一种新的细观结构构建提出了一种用于 PBX 的方法。构建的细观结构具有良好的级配关系，同时具有高 PVF（最大 94.99%）。也可以实现细观结构边界上的严格周期性。为了验证构建的 PBX 细观结构，考虑细观结构尺寸、PVF、级配、初始缺陷等不同影响因素，采用数值流形法(NMM)模拟所构建细观结构的有效模量，对模拟结果进行定性分析，并讨论了模拟结果与可用实验结果或其他数值结果之间差异的原因。验证了所提出的构建PBX细观结构的方法的有效性。这项工作还为在中尺度 PBX 的机械和热行为的进一步数值研究提供了基础。对模拟结果进行了定性分析，讨论了模拟结果与现有实验结果或其他数值结果之间存在差异的原因。验证了所提出的构建PBX细观结构的方法的有效性。这项工作还为在中尺度 PBX 的机械和热行为的进一步数值研究提供了基础。对模拟结果进行了定性分析，讨论了模拟结果与现有实验结果或其他数值结果之间存在差异的原因。验证了所提出的构建PBX细观结构的方法的有效性。这项工作还为在中尺度 PBX 的机械和热行为的进一步数值研究提供了基础。