(11月15日9:00)报告1：Scale Invariance & Internal Lengths in Gradient Material Mechanics 报告2：Failure mechanism and damage characterization of ceramic coatings（因故更改）----中国科学院力学研究所非线性力学国家重点实验室

学术报告/通知时间: 2016-11-11 来源: 【大 | 中 | 小】【打印】

(11月15日9:00)报告1：Scale Invariance & Internal Lengths in Gradient Material Mechanics 报告2：Failure mechanism and damage characterization of ceramic coatings（因故更改）

副标题：

报告题目1：

Scale Invariance & Internal Lengths in Gradient Material Mechanics

报告人: E.C. Aifantis 教授

Aristotle University, Thessaloniki, GR-54124, Greece

时间：2016年11月15日(周二) 9: 00

地点：中科院力学所1号楼344会议室

报告摘要：

A Laplacian-based internal length gradient (ILG) approach is used to consider stochasticity and multiphysics couplings for deformation processes at various scales. The interplay between deformation internal lengths (ILs) and ILs induced by thermal or diffusion fields is illustrated. Size-dependent thermomechanical and chemomechanical stability diagrams are obtained. Size-dependent serrated stress-strain curves are interpreted through combined gradient-stochastic models. When differential equations are not available for describing material behavior, a Tsallis non-extensive thermodynamic formulation is employed to characterize statistical properties. The extension of ILG to consider fractional derivatives and fractal media is explored. Three apparently different emerging research areas of current scientific/technological/biomedical interest are discussed: (i) Plastic instabilities and size effects in nanocrystalline (NC)/ultrafine grain (UFG) and bulk metallic glass (BMG) materials; (ii) Chemomechanical damage and size-dependent phase diagrams in energetic materials; (iii) Brain tissue and neural cell modeling.

报告人简介：

Professor Elias C. Aifantis is a renowned scientist, with many pioneering works in mechanics. He received PhD degree from Univ. of Minnesota at 1975. His research interests cover a broad area, including diffusion and environmental, stress corrosion cracking, flow through porous media and soil/rock mechanics, phase transitions and interfaces, micro/nanomechanics of elasticity, plasticity and fracture, material instabilities – dislocation patterning/shear banding/damage localization, gradient elasticity/plasticity and size effects, novel and nanostructured materials. He has published over 450 papers on these subjects as articles in scientific journals and chapters in books, with about 5300 citations and H-factor 38.

报告题目2：

Failure mechanism and damage characterization of ceramic coatings

报告人: 梁立红副研究员

非线性力学国家重点实验室

时间：2016年11月15日(周二) 10: 30

地点：中科院力学所1号楼344会议室

报告摘要：

Failure and damage characteristics of different thicknessed and microstructured ceramic coatings will be reported based on in-situ three-point bending experiments, the finite element simulations with the interface cohesive model, and the catastrophic damage model. Thickness-dependent failure modes of coatings were found and explained by different domination stresses. Damage evolution of the coating obeys the same power-law relation as that of bulk ceramics, the damage variable increases rapidly when the load is close to the failure point, and damage rate shows the power-law singularity at the failure point. The damage localization degrees are different for thick, thin coatings and for nanostructured, conventional coatings, which may be related to different microstructures and size-dependent interface/cohesive strength.

报告人简介：

Dr. Lihong Liang is an associate professor in LNM. She obtained her Ph.D degree from Jilin University in 2003, then worked two years in Institute of Physics, CAS as a Postdoctor, and worked in National University of Singapore as a Research Fellow until 2007, she came to Institute of Mechanics, CAS in the same year. She is interested in study on thermodynamics of nanomaterials, size-dependent thermal conductivity, elastic modulus, and related surface/interface energy models, etc. She has more than 30 SCI publications, and her work has been cited by SCI more than 600 times. Today she will talk her work in recent years about failure mechanism and damage characterization of micro/nanostructured ceramic coatings.

附件下载

E.C.Aifantis教授简历.pdf

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