By W. Yang
This ebook summarizes the study findings as an end result 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 buildings and lively keep an eye on structures, and feature attracted vast recognition from scientists of either mechanics and fabrics sciences groups. excessive functionality and balance of actuating fabrics and constructions play a decisive function of their successive functions as sensors and actuators in structural keep an eye on and robotics. towards this finish, medical efforts are of paramount importance to achieve a deep perception into the elaborate deformation and failure behaviors of actuating fabrics. Examples valuable of in depth exploration are: (1) the constitutive family members of actuating fabrics that couple mechanical, electric, thermal and magnetic homes, in addition to include part transformation and area change; (2) the actual mechanisms of deformation, harm, and fatigue crack development of actuating fabrics; (3) the advance of failure-resilient ways that base at the macro-, meso-, and micro-mechanics analyses; (4) the research of microstructural evolution, balance of part transformation, and measurement 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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A sketch of the experimental set-up is shown in Figure 1a. 42 high voltage amplifier V~ ±10kV function generator metal contacts container with silicon oil PZT sample Notch Figure 1. (a) Experimental set-up for the crack propagation experiments under a cyclic electric field and (b) loading configuration for the R-curve measurements The 2-mm-thick samples were used for R-curve measurements under a constant electric field. At one end they can be loaded with a wire connected to a load cell and are also notched with the wire saw.
45, 1907-1915. 8. H. Salje, Y. Ishibashi, 1996, Mesoscopic structures in ferroelastic crystals: needle twins and rightangled domains, J. Phys. Condens. Matter, 8, 8477-8495. 9. Z. Suo, 1990, Singularities, interfaces and cracks in dissimilar anisotropic media, Proc. , A427, 331-358. 10. C. M. McMeeking, 1999, A finite element model of ferroelastic polycrystals, Int. J. Solids Structures, 36, 1541-1556. N. X. Li FML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China Abstract In this investigation, the internal bias field in donor doped PZT ceramics was investigated through measuring both the electric hysteresis loops and the butterfly loops.
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