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.

该研究的目的是开发一种计算模型来预测季戊四醇四硝酸酯（PETN）高能晶体粉末在高应变率负载下的热机械响应。该模型将能够根据晶体尺寸和孔隙率等相关参数来预测相关的热点点火。这些模型将是极其有价值的设计工具；仅仅依靠实验是有问题的，因为高应变率常常会由于惯性效应而污染数据。此外，目前还无法通过实验可视化晶体长度尺度的变形和热过程。后者很重要，因为它决定了高度局部的大变形和伴随的温升/点火。该项目将以先前对微机械模型的大量研究为基础，用于预测帝国理工学院高颗粒复合材料的本构响应，将微观结构与非均质材料的整体响应联系起来。