高层次专家---李少凡教授学术报告会通知(2017--48)


发布时间: 2017-12-19     浏览次数: 192

题  目:Introduction to Peridynamics and Its Simulations of Fracture and Fragmentation of Solids and Granular Materials
报 告人:李少凡教授
时   间:2017年12月21日(周四)上午10:00-12:00
地   点:河海大学江宁校区乐学楼1116室
主办单位:河海大学力学与材料学院计算力学研究所

报告内容简介:
    Peridynamics is a relatively new nonlocal meshfree particle method that can be used to conduct fast simulation of fracture and fragmentation of solids without remesh. In this talk, we shall introduce the theory of both bond-based peridynamics as well as the state-based peridynamics, their computational formulations, focusing on issues of computer implementation and physical modeling. Moreover, we shall discuss our recent wok on developing a nonlinear peridynamics model for granular materials, such as the non-saturated and the full saturated soils, and how to 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. We have implemented 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.

报告人简介:
     李少凡,美国加州大学伯克利分校(UCB)终身教授。1982年本科毕业于华东理工大学,1989年和1993年分别获华中科技大学和美国佛罗里达大学(UF)硕士学位,1997年获美国西北大学(NWU)博士学位,1997年至2000年在美国西北大学伊文斯顿分校从事博士后研究,2000年至今就职于美国加州大学伯克利分校。
李少凡教授为教育部“长江学者”讲座教授,获得过世界计算力学大会计算力学奖(2013年)、美国计算力学学会奖(2013年)、理查德•牛顿(A.Richard Newton)研究突破奖(2008年)、国家科学基金会职业奖(2003年)等奖励。已发表高质量的SCI期刊论文130余篇,H因子高达42,并出版2部学术专著。