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大连理工大学李锡夔教授莅临我院做学术报告
2019-10-27  

大连理工大学李锡夔教授莅临我院做学术报告

 

大连理工大学工程力学系李锡夔教授于20191023日到访机械工程与力学学院,并为学院教师和学生做了题为饱和颗粒材料的二阶协同计算均匀化方法与多尺度水力-力学模拟的学术报告。 李锡夔教授是大连理工大学运载工程与力学学部教授,博士生导师。师从英国皇家学会会员OC Zienkiewicz教授,获英国威尔士大学博士学位。中国力学学会第六、七、八届理事。曾任中国力学学会固体力学专业委员会副主任,主任 (1999-2011),国家自然科学基金委专家评审组成员、组长。澳大利亚科学委员会聘任Newcastle大学International Fellow (ARCIF)"Int. J. for Numerical Methods in Eng." 编委;"Int. J. of Damage Mechanics" 编委;"Int. J. of Damage Mechanics" 专辑“Damage Mechanics in China”客座主编。国际华人计算力学协会执行委员(2007-)。大连理工大学国际计算力学研究中心科学委员会委员(2016-)。中国力学学会颗粒材料计算力学专业组组长(2013-)。第七届离散元法国际会议(2016,8)主席。研究领域包括:计算力学,多孔多相介质力学,颗粒材料力学,非饱和土力学,多尺度方法,耦合问题中的非线性有限元方法,高分子材料成型充填过程数值模拟等。发表二百余篇期刊学术论文,包含国际学术期刊论文九十余篇。获国家教育部科学技术进步奖二等奖,中国高校自然科学二等奖,国家教育部自然科学奖二等奖,国家教育部自然科学奖一等奖。亚太计算力学协会授予“APACM Award for Senior Scientists”。国际华人计算力学协会授予“ICACM Fellows Award”。被授予大连市第一届优秀专家称号,辽宁省优秀科技工作者称号。享受国务院政府特殊津贴。

在学术报告会上,王骥教授简要介绍了李锡夔教授的学术经历,并对李锡夔教授的到来表示欢迎。本次报告主要围绕颗粒材料离散-连续体模型的二阶计算均匀化方法进行,李锡夔教授从饱和颗粒材料的协同计算均匀化方法与破坏表征出发,首先介绍了饱和颗粒材料在宏介观两个尺度具有不同的连续与离散特征,可以通过信息在两个尺度间的上、下传输与同时求解定义在介观尺度的初边值问题的嵌套数值方案,实现具离散介观结构的表征元尺度与宏观多孔连续体尺度的双向耦合;接着,从Cosserat和梯度增强Cosserat连续体模型、广义Hill定理、降尺度(downscaling)和 升尺度(upscaling)、梯度Cosserat连续体的混合有限元方法和可破碎离散元模型等几个方面展开本次报告会。讨论提问环节,李锡夔教授同与会师生进行了充分的学术讨论,也同大家分享了自己的学术心得,让大家受益匪浅。

 

Prof. Xikui Li Presented a Talk in His Visit

 

Prof. Xikui Li from Dalian University of Technology presented a talk on "Second-order concurrent computational homogenization method and multi-scale hydro-mechanical modeling for saturated granular materials" to a broad audience of researchers and students on Oct. 23, 2019 in the School of Mechanical Engineering and Mechanics, Ningbo University, in his visit.

Xikui Li is a professor at the Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology. He received his PhD from the University of Wales under Prof. OC Zienkiewicz, a member of the British Royal Society. Prof. Li is an editorial board member of "Int. J. for Numerical Methods in Eng." and "Int. J. of Damage Mechanics", guest editor of the special issue "Damage Mechanics in China" of "Int. J. of Damage Mechanics". Prof. Li is also the executive member of the International Chinese Computational Mechanics Association (2007-), the member of the Scientific Committee of the International Center for Computational Mechanics Research, Dalian University of Technology (2016-), the head of the Professional Group of Computational Mechanics in Granular Materials, Chinese Society of Mechanics (2013-), the Chairman of the 7th International Conference on Discrete Element Methods (2016, 8). His research interests include computational mechanics, multiphase porous media mechanics, granular material mechanics, unsaturated soil mechanics, multiscale methods, nonlinear finite element methods in coupling problems, numerical simulations of polymer material forming and filling processes, etc. He has published more than 200 academic journal papers, including more than 90 papers in international academic journals. He was awarded the second prize of the National Science and Technology Progress Award of the Ministry of Education, the second prize of the Natural Science of Chinese Universities, the second prize of the Natural Science Award of the Ministry of Education, and the first prize of the Natural Science Award of the Ministry of Education. The Asia Pacific Computational Mechanics Association awarded him the "APACM Award for Senior Scientists". The International Chinese Computational Mechanics Association awarded him the “ICACM Fellows Award”.

The presentation mainly focuses on the second-order computational homogenization method for the discrete-continuum model of granular materials. Prof. Li started from the concurrent computational homogenization method and damage characterization of saturated granular materials. First, the continuous and discrete features of the saturated granular materials in macro- and meso-scopics are introduces. The information can be transferred between macro- and meso-scopic sacles and the multiscale numerical strategy is proposed for the bidirectional coupling of the representative volume element and macroscopic continuum scale. Moreover, the presentation includes the following aspects as: the Cosserat and gradient-enhanced Cosserat continuum model, the generalized Hill theorem, the downscaling and upscaling, the mixed finite element of the gradient Cosserat continuum, the fragmentable discrete element model and the representative numerical examples. At the end of the talk, Prof. Li had an in-depth discussion with the faculty members and students at the computational multiscale method. He also shared his academic experience with the audience.

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