题目：Computer Modelling and Digital Twin of Advanced Ceramic Processing
Abstract: At elevated temperatures, fine particles tend to form necks between themselves and consolidate into a strong solid. This process is known as sintering. As an ancient technique, sintering has been used to make bricks, china and potteries. As a modern technology, sintering is being used to produce a wide range of high-tech materials and products. Almost all ceramic products and an increasing number of metal, polymer and glass components are made by sintering. In this part of the talk, existing sintering theories (mainly developed between 1950-1960) will be briefly reviewed. These theories will then be criticised and a much older approach, the variational method due to Euler (1707-1783), will be advocated. The old approach leads to a unified basis for computer modelling of the sintering process which involves all possible mechanisms of matter redistribution. Numerical schemes have been developed to simulate microstructural evolution and macroscopic deformation using the variational approach.
A digital twin refers to a set of physical process (such as sintering) and its digital representation (such as a finite element model for sintering). It is a natural extension to computer modelling that has been made possible by the abundant availability of low cost and fast in-process measurement and data collection. A key difference between conventional computer modelling and digital twin is that the computer models on the digital side of the twin are frequently updated and revised using the data collected from the physical side of the twin. The key advantage of this approach is to reduce uncertainty in the computer models. In this part of the talk the existing material models for ceramic processing are reviewed in the context of digital twin.
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