Download IUTAM Symposium on Mechanics and Reliability of Actuating by W. Yang PDF

By W. Yang

This e-book summarizes the study findings as an consequence from the IUTAM Symposium "Mechanics and Reliability of Actuating fabrics held effectively on September 1-3, 2004 at Tsinghua college, Beijing, China. Actuating fabrics carry a promise for fast-spreading purposes in shrewdpermanent constructions and energetic keep an eye on structures, and feature attracted broad realization from scientists of either mechanics and fabrics sciences groups. excessive functionality and balance of actuating fabrics and constructions play a decisive position of their successive functions as sensors and actuators in structural keep watch over and robotics. towards this finish, clinical efforts are of paramount value to realize a deep perception into the difficult deformation and failure behaviors of actuating fabrics. Examples invaluable of in depth exploration are: (1) the constitutive kin of actuating fabrics that couple mechanical, electric, thermal and magnetic houses, in addition to contain part transformation and area swap; (2) the actual mechanisms of deformation, harm, and fatigue crack progress of actuating fabrics; (3) the improvement of failure-resilient methods that base at the macro-, meso-, and micro-mechanics analyses; (4) the research of microstructural evolution, balance of part transformation, and dimension results of ferroelectric ceramics, form reminiscence alloys and actuating polymers. The above difficulties symbolize an exhilarating problem and shape a learn thrust of either fabrics technological know-how and sturdy mechanics.

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Similar experiments were performed by Förderreuther et al. [15] in BaTiO3 ceramics. Crack initiation from a notch was also observed and a dependence of the pop-in length on the notch length was found. Also different regimes of crack propagation were observed depending on the number of applied cycles. 2. Experimental procedure The material used in the experiments is a commercially available, soft-doped PZT material (PIC 151) manufactured by PI Ceramic (Lederhose, Germany). 5mm³ or 40 × 5 × 2mm³ in dimension.

Yang , 1F. C Zhang, 2H. S. Luo Failure Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing, China 2 The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China 1 Abstract In-situ observation of electrically induced fatigue crack growth was carried out for ferroelectric single crystals under alternative electric field. Electrically-induced fatigue crack growth was observed both below and above the coercive field.

Gurtin, 2000, Configurational Forces as Basic Concept of Continuum Physics, Springer, Berlin. D. Gross, S. Kolling, R. Mueller, I. Schmidt, 2003, Configurational forces and their application in solid mechanics, European Journal of Mechanics A/Solids, 22, 669-692. R. Mueller, G. Maugin, 2002, On material forces and finite element discretizations, Comput. , 29, 52-60. IN-SITU OBSERVATION OF ELECTRICALLY INDUCED FATIGUE CRACK GROWTH FOR FERROELECTRIC SINGLE CRYSTALS 1 F. Fang, 1W. Yang , 1F. C Zhang, 2H.

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