报 告 人：Shaofan Li教授（美国加利福尼亚大学伯克利分校）
报告地点：7号楼7201学术报告厅
报告题目1：Recent Developments in Computational Failure Mechanics
报告时间：2016年07月11日星期一上午9:30 - 11:30
报告题目2：Introduction to Bond-based Peridynamics and Simulation of Fracture
报告时间：2016年07月13日星期三上午9:30 - 11:30
报告题目3：Introduction to the State-based Peridynamics and Simulation ofFragmentation of Granular Materials
报告时间：2016年07月15日星期五上午9:30 - 11:30
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土木与交通学院
2016年7月4日
附：Shaofan LI教授简历：
Dr. Shaofan Li is currently a full professor of applied and computational mechanics at the University of California-Berkeley. Dr. Li graduated from the Department of Mechanical Engineering at the East China University of Science and Technology (Shanghai, China) with a Bachelor Degree of Science in 1982; he also holds Master Degrees of Science from both the Huazhong University of Science and Technology (Wuhan, China) and the University of Florida (Gainesville, FL, USA) in Applied Mechanics and Aerospace Engineering in 1989 and 1993 respectively. In 1997, Dr. Li received the PhD degree in Mechanical Engineering from the Northwestern University (Evanston, IL, USA), and he was also a post-doctoral researcher at the Northwestern University during 1997-2000.
In 2000, Dr. Li joined the faculty of the Department of Civil and Environmental Engineering at the University of California-Berkeley. Dr. Shaofan Li has also been a visiting Changjiang professor in the Huazhong University of Science and Technology, Wuhan, China (2007-2010). Dr. Shaofan Li is the recipient of Distinguished Fellow of ICCES [2014], The ICACM Computational Mechanics Award; The USACM Fellow Award (The United States Association of Computational Mechanics) [2013]; A. Richard Newton Research Breakthrough Award (2008), and NSF Career Award (2003). Dr. Li has published more 120 articles in peer-reviewed scientific journals, and he is the author and co-author of two research monographs/graduate textbooks.
题目1，Recent Developments in Computational Failure Mechanics报告摘要：
In this presentation, we shall discuss the recent developments in computational failure mechanics and its applications to simulations of crack growth, fragmentation, and dynamic fracture and structure failures. In the past a few decades, much progress has been made in developing novelnumerical methods that are capable of simulating and predicting both structural as well as material failures, which has been a major challenge for the conventional finite element methods. There are three types of approaches to this problem: microscale approach, macro scale approach, and multiscale approach. In this talk, we shall discuss the latest developments and the state-of-art technologies in simulation material failures at microscale level, macroscale level, and at the current multiscale level.
At microscale, molecular dynamics is a powerful method to simulate both crack growth as well as dislocation nucleation and propagations; and at macroscale level, the meshfree method, extended finite element method, and cohesive finite element method are three main simulation methodologies or techniques that are currently used for simulations of structural damages and failures in engineering applications. Basic mechanics principles, computational strategies, and application examples will be discussed to demonstrate how these methods are applied to solve real engineering problems.
Finally, we shall introduce our recently developed multiscale cohesive zone model that is capable of simulating arbitrary three-dimensional mixed mode dynamic fracture and fragmentation during high-speed impact. In this presentation, we shall also discuss what are the current focus as well as future challenges in this research area.
题目2，Introduction to Bond-based Peridynamics and Simulation of Fracture报告摘要：
Peridynamics is a reformulation of continuum mechanics and it can be used to conduct fast simulation of fracture and fragmentation of solids without remesh. In this talk, we shall introduce and review the theory ofbond-based peridynamics as well as its computational formulations, focusing on issues of computer implementation and physical modeling.
In particular, we shall discuss the so-called lattice peridynamics and how to apply to solve fracture and damage of structure mechanics problems.
In particular, we shall present two-dimensional bond based peridynamics code during the lecture, and illustrate how to use the code to simulate fracture.
题目3：Introduction to the State-based Peridynamics and Simulation ofFragmentation of Granular Materials报告摘要:
Peridynamics a relative new nonlocal meshfree particle method that can be used to conduct fast simulation of fragmentation of granular materials, such as soil, concrete materials, and ice solid. In this talk, we shall briefly introduce the state-based peridynamics methodology, and we shall then discuss our recent wok on developing a nonlinear peridynamics model of the non-saturated and the full saturated soils, and we apply them to simulate soil fragmentation due to both impulse and blast loads.
The presented work is the latest development of computational geotechnical materials.
First, we have extended the state-based peridynamics technique, which replaces the local differential equation with a non-local integral equation, to implement the Drucker-Prager constitutive model in peridynamics for finite deformation. Here the peridynamics form of the Hughes and Winget theory is derived for the finite deformation constitutive update. Second, we have developed a peridynamics U-p formulation for saturated soils. Third, numerical simulations have been carried out to verify the proposed peridynamics formulations in soil fragmentation for several bench mark problems. The comparison of the numerical, theoretical,and experimental results indicate that peridynamics model has the capability in prediction of the complex soil fragmentation under blast loads.
