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

含能晶体微机械建模博士生，用于估计高应变率下的热机械响应

• 批准号: 2740323
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2740323
• 关键词: PhD; Studentship; Micromechanical; Modelling; Energetic

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.

研究的目的是建立一个计算模型来预测高应变率载荷下四硝酸季戊四醇（PETN）含能晶体粉末的热力学响应。该模型将能够预测相关热点点火作为相关参数，如晶体尺寸和孔隙率的函数。这些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，因为由于惯性效应，高应变率经常会污染数据。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。后者是重要的，因为它决定了高度局部化的大变形和伴随的温升/点火。该项目将建立在帝国理工大学预测高颗粒复合材料本构响应的微观力学模型的大量前期研究基础上，将微观结构与非均匀材料的体响应联系起来。