PhD Studentship in Micromechanical Modelling of Energetic Crystals for Estimating the Thermomechanical Response at High Strain Rates

本研究的目的是建立一个计算模型来预测高应变率加载下季戊四醇四硝酸酯（PETN）含能晶体粉末的热机械响应。该模型将能够预测相关的热点点火作为相关参数，如晶体尺寸和孔隙率的函数。这种模型将是非常有价值的设计工具;仅仅依靠实验是有问题的，因为高应变率往往会由于惯性效应而污染数据。此外，目前还不可能在实验上可视化晶体长度尺度上的变形和热过程。后者很重要，因为它决定了高度局部化的大变形和伴随的温升/点火。该项目将建立在大量的微观力学模型预测本构反应的高颗粒复合材料在帝国，连接的微观结构的不均匀材料的体积响应之前的研究。

The aim of the research is to develop a computational model to predict the thermomechanical response of pentaerythritol tetranitrate (PETN) energetic crystal powders under high strain rate loading. The model will enable the prediction of associated hot-spot ignition as a function of relevant parameters such as crystal size and porosity. Such models will be extremely valuable design tools; relying on experiments alone is problematic as high strain rates often contaminate data due to inertia effects. In addition, it is not currently possible to visualize experimentally the deformation and thermal process at the crystal length scale. The latter is important as it determines the highly localized large deformation and accompanying temperature rise/ignition. The project will build on substantial prior research into micromechanical models for predicting the constitutive response of highly particulate composites at Imperial, linking the microstructure to the bulk response of inhomogeneous materials.