时间：11月11日（周日） 上午11：00

地点：机械与运载工程学院5楼报告厅

主讲人：达代聪

主讲人简介：

达代聪，湖南大学机械与运载工程学院2013级直博生，导师为李光耀教授。于2016年11月至2018年10月作为联合培养博士生在法国巴黎东部大学(Université Paris-Est, 简称UPE)进行学习，联合培养导师为Julien Yvonnet教授。主要研究方向为拓扑优化设计方法，高性能多尺度结构设计，智能材料设计，材料与结构抗裂性计算与优化方法等。在Computer Methods in Applied Mechanics and Engineering, International Journal for Numerical Methods in Engineering, Computers & Structures, Structural and Multidisciplinary Optimization 等工程计算与结构优化设计顶级学术期刊上发表SCI检索论文8篇。担任国际计算力学大会分会场主席1次，协助组织欧洲应用科学计算方法专题会议1次。

内容提要：

Mechanical and physical properties of complex heterogeneous materials are determined on one hand by the composition of their constituents, but can on the other hand be drastically modified by their microstructural geometrical shape. Topology optimization aims at defining the optimal structural or material geometry with regards to specific objectives under mechanical constraints like equilibrium and boundary conditions. Recently, the development of 3D printing techniques and other additive manufacturing processes have made possible to manufacture directly the designed materials from a numerical file, opening routes for totally new designs. We aim to develop modeling and numerical tools to design new materials using topology optimization. More specifically, the following aspects are investigated. First, topology optimization in mono-scale structures is developed. We primarily present a new evolutionary topology optimization method for design of continuum structures with smoothed boundary representation and high robustness. In addition, we propose two topology optimization frameworks in design of material microstructures for extreme effective elastic modulus or negative Poisson’s ratio. Next, multiscale topology optimization of heterogeneous materials is investigated. We firstly present a concurrent topological design framework of 2D and 3D macroscopic structures and the underlying three or more phases material microstructures. Then, multiscale topology optimization procedures are conducted not only for heterogeneous materials but also for mesoscopic structures in the context of non-separated scales. A filter-based nonlocal homogenization framework is adopted to take into account strain gradient. Finally, we investigate the use of topology optimization in the context of fracture resistance of heterogeneous structures and materials. We propose a first attempt for the extension of the phase field method to viscoelastic materials. In addition, phase field methods for fracture able to take into account initiation, propagation and interactions of complex both matrix and interfacial micro cracks networks are adopted to optimally design the microstructures to improve the fracture resistance.