2005年全国固体力学青年学者研讨会简介

由国家自然科学基金委员会数理科学部发起,国家自然科学基金委员会数理科学部和中国力学学会主办的“2005年固体力学青年学者研讨会”于2005年10月14～16日在杭州浙江大学召开。本次研讨会主席由清华大学冯西桥和浙江大学陈伟球担任。     

Preface to the Special Issue in Celebration of Professor Shouwen Yu’s 70th Birthday

Shouwen Yu,emeritus Professor of Applied Mechanics at Tsinghua University,was born on May 4,1939 in Xianyou County,Fujian Province of China.From 1955 to 1958,he studied as an undergraduate     

随动强化结构的安定性分析

本文提出并证明了随动强化结构不可能发生累积塑性破坏,即交变塑性是指唯一可能的破坏形式,并且与时间无关的平衡力系对结构的安定性没有影响。     

A SIMPLE CONSTITUTIVE MODEL FOR FERROELECTRIC CERAMICS UNDER ELECTRICAL/MECHANICAL LOADING

A simple phenomenological model is developed for describing the macroscopic constitutive response of ferroelectric materials based on consideration of the fact that domain switching is a progressive evolution process with loading. The volume fraction of domain switching is taken as an internal variable, which is derived from the domain nucleation theory. The proposed theory can simulate the dielectric hysteresis, reversed butterfly hysteresis, nonlinear strain-stress hysteresis, as well as electric displacement-stress relation of ferroelectric materials. Its comparison with experimental results and two other theoretical models reveals that the model presented can well predict the nonlinear hysteresis of ferroelectrics under electrical or mechanical loading.     

第二届全国固体力学青年学者学术研讨会简介

由国家自然科学基金委员会数理科学部和中国力学学会发起并主办的"第二届固体力学青年学者学术研讨会"于2006年8月26～28日在成都西南交通大学召开.本次研讨会主席由清华大学冯西桥和西南交通大学康国政共同担任.     

Snapping instability in prismatic tensegrities under torsion

Tensegrities are a class of lightweight and reticulated structures consisting of stressed strings and bars. It is shown that each prismatic tensegrity can have two self-equilibrated and stable states, leading to a snapping instability behavior under an applied torque. The predicted mechanism is experimentally validated, and can be used in areas such as advanced sensors and actuators, energy storage/adsorption equipments, and folding/unfolding devices.     

第21届国际理论与应用力学大会评述

介绍了2004年8月15~21日在波兰华沙召开的第21届国际理论与应用力学大会的召开情况, 以及大会在理论与应用力学领域所显示出的最新研究成果和发展趋势.      

第十一届国际断裂力学大会(ICF11)简介与断裂研究的前瞻

第十一届国际断裂力学大会（11th International Conference on Fracture,ICF11）于2005年3月20日～25日在意大利都灵（Turin）召开.本文对这次大会的内容加以简单介绍,并对本次会议所反映的断裂研究与应用的发展趋势进行简要评述.     

Scattering of love waves by an interface crack between a piezoelectric layer and an elastic substrate

The scattering of Love waves by an interface crack between a piezoelectric layer and an elastic substrate is investigated by using the integral transform and singular integral equation techniques. The dynamic stress intensity factors of the left and the right crack tips are determined. It is found from numerical calculation that the dynamic response of the system depends significantly on the crack configuration, the material combination and the propagating direction of the incident wave. It is expected that specifying an appropriate material combination may retard the growth of the crack for a certain crack configuration. Project supported by the National Natural Science Foundation of China (No. 19891180), the Fundamental Research Foundation of Tsinghua University (JZ 2000.007) and the Fund of the Education Ministry of China.