The development of multiscale constitutive models for powder processing: from particles to products

粉末加工多尺度本构模型的开发：从颗粒到产品

基本信息

批准号：
EP/C545249/1
负责人：
Chuan-Yu Wu
金额：
$ 22.47万
依托单位：
University of Birmingham
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2006
资助国家：
英国
起止时间：
2006 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FC545249%2F1
关键词：
development multiscale constitutive models powder

项目摘要

In a number of industrial sectors, such as pharmaceuticals, chemicals, food, ceramics and powder metallurgy, processing of dry powders is a general route to making products. To manufacture high quality products using this processing technique is a challenging task because of the complexity and diversity of material properties and processing conditions. Rapid growth and expansion in these industries and intensive competition demands high effectiveness and stringent quality control of the process. Conventional empirical design routes, which generally employ trial-and-error approaches, cannot meet these requirements. A rigorous model is urgently needed to accurately predict the powder behaviour during processing and the performance of final products from the properties of the constituent particles, especially of small quantities in the early stages of product development. The primary goal of the proposed project is to develop robust mufti-scale constitutive models which will be based upon combining different numerical methods: discrete and continuum. The former will be used to model at micro-scale, in which the powder is treated as a assembly of individual particles interacting each other. The latter will be developed as a platform to explore the powder behaviour and the performance of the product at the macroscale, for which the constitutive coefficients will be determined based upon simulations with the discrete methods. The powders used in various industries mentioned above are of various types, such as elastic, elastoplastic, viscoelastic and viscoplastic, and with different bonding mechanisms, such as bonding through van der Waals' force or adhesion due to the presence of interfacial energy. In order that the mufti-scale model to be developed can take these factors into account, rigorous contact laws between these particles will also be developed and incorporated into the mufti-scale models, so that the influence of materials properties of the particles and the bonding mechanisms can be analysed and the developed model can be used in a variety of applications. Furthermore, most industrial processing is carried out in air. During the rapid flow of powder in the early stages of processing, where the powder is delivered from one apparatus to another, the air flow may be important. To explore this effect, numerical models will also be developed to simulate the gas/solid two phase flow. This allows the effects of air flow on the powder behaviour and the performance of the final products to be identified. The developed model will be quantitatively validated by experimental testing using Positron Emission Particle Testing (PEPT), a method developed at the University of Birmingham. The mufti-scale model developed will enhance understanding of powder processing and will be a valuable tool for process design and product development in a number of industries.

在制药、化工、食品、陶瓷和粉末冶金等许多工业领域，干粉加工是制造产品的通用途径。由于材料特性和加工条件的复杂性和多样性，使用这种加工技术制造高质量的产品是一项具有挑战性的任务。这些行业的快速增长和扩张以及激烈的竞争要求过程的高效性和严格的质量控制。传统的经验设计路线通常采用试错法，无法满足这些要求。迫切需要一个严格的模型来根据组成颗粒的性质，特别是在产品开发的早期阶段，准确预测加工过程中粉末的行为以及最终产品的性能。该项目的主要目标是开发鲁棒的多尺度本构模型，该模型将基于组合不同的数值方法：离散和连续。前者将用于微尺度建模，其中粉末被视为彼此相互作用的单个颗粒的集合。后者将被开发为一个在宏观尺度上探索粉末行为和产品性能的平台，其本构系数将根据离散方法的模拟来确定。上述各个行业所使用的粉末具有不同的类型，如弹性、弹塑性、粘弹性和粘塑性，并且具有不同的结合机制，如通过范德华力结合或由于界面能的存在而粘附。为了使要开发的多尺度模型能够考虑到这些因素，这些颗粒之间的严格接触定律也将被开发并纳入多尺度模型中，以便颗粒的材料特性和键合的影响可以分析机制，并且开发的模型可以用于各种应用。此外，大多数工业加工是在空气中进行的。在加工早期阶段粉末快速流动期间，粉末从一个设备输送到另一个设备，气流可能很重要。为了探索这种效应，还将开发数值模型来模拟气/固两相流。这样可以确定气流对粉末行为和最终产品性能的影响。所开发的模型将通过使用伯明翰大学开发的正电子发射粒子测试（PEPT）的实验测试进行定量验证。开发的多尺度模型将增强对粉末加工的理解，并将成为许多行业的工艺设计和产品开发的宝贵工具。