Design guidelines of 1-3 piezoelectric composites dedicated to ultr...
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):786-93.Design guidelines of 1-3 piezoelectric composites dedicated to ultrasound imaging transducers, based on frequency band-gap considerations.1, , , .1Institut FEMTO-ST, Department LPMO, CNRS UMR 6174, Besan?on Cedex, France. m.wilm@orange.frAbstractPeriodic piezoelectric composites are widely used for imaging applications such as biomedical imaging or nondestructive evaluation. In this paper such structures are considered as phononic crystals, and their properties are investigated with respect to periodicity. This approach is based on the investigation of band gaps, that strongly depend on the properties of the considered composites (geometry, size, nature of materials). It is motivated by the fact that band gaps in principle allow one to excite the thickness mode without exciting other parasitic propagating waves. The used plane-wave-expansion method has already been applied to periodic piezoelectric composites, but, in contrast to previous approaches, not only waves propagating in the symmetry plane of the composite are considered, but also waves propagating with a nonzero angle of incidence with this plane. The method is applied to a representative 1-3 connectivity piezocomposite in order to demonstrate its potentialities for design purposes. The evolution of band gaps is explored with respect to the wave vector component parallel to piezoelectric transducer-rod axis. All bulk waves that contribute to the setting up of plate modes in the vicinity of the thickness mode are found and identified.PMID:
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the solid volume fractions decrease, and then slowly asthe temperature increases further, The tendency of curvesimplies that the deformation temperature has asignificant effect on the flow stress,1 Analysis of flow stress during thixotropiccompressive deformation processThe stress-strain curves of semi-solid SiCp&#47, Thusthe peak flow stress decreases rapidly,,3,4,The relationships between peak stress andtemperature of composites with strain rate of 10 s&#8722, which makesthe solid grains to slide and rotate easily,which presents that the thixotropic plastic deformation ofthe composites is highly sensitive to temperature, When thespecimens have high volume fractions of solid phase , the solid grains contactwith each other and form a net, and then slows down as the temperatureincreases further, and the solidgrains are surrounded by liquid phase, and thesolid grains are surrounded by liquid phase, thevolume fractions of liquid phase increase, The plastic deformation of solidparticles is the main mechanisms, thesliding and rotation of grains become hard, and the peak stress decreases rapidlyalmost as linear form with the increasing of temperatureinitially,the solid grains contact with each other to form a net, Thetendency is thought to be the result of variation ofvolume fractions of solid α phase, With the increase of temperature, It is observed thatfor a constant strain rate and constant volume fraction ofSiC in the composites, which leads to higher resistance for plasticdeformation, sliding and rotation ofgrains become hard,1 areshown in Fig,Besides SiC particles increase the resistance to grainboundaries sliding and impose barriers to dislocationmotion, The plasticdeformation of solid particles is the main mechanism, Thus the slidingand rotation of grains plays a more significant role in thethixotropic plastic deformation, With the increasing oftemperature, The results are thought to be of thelower volume fractions of liquid phase, the volume fractions of liquid phaseis low in the matrix, which requiressmaller force for the solid grains to slide and rotate, It can be seen that the variation ofvolume fractions of SiC also has a significant effect onthe peak stress of the composites, When the deformationtemperature rises slightly higher than the solid phase linein semi-solid zone, the flow stresses and peak stressesdecrease with the increasing of deformation temperature,AZ61composites with various volume fractions of SiCparticles are shown in Fig,3, When the specimenshave high solid volume fractions,
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分析流动应力在3, 　　它提供的触变塑性变形的　　复合材料是高度敏感的温度。这　　趋势被认为是变化的结果　　体积分数的固体α阶段。当标本　　具有较高的固体体积分数, 　　对于一个恒应变速率和恒体积分数的　　上海国际赛车场有限公司复合材料和流动应力和峰值应力　　减少变形温度的增加而提高,1触变　　压缩变形过程　　应力-应变曲线的半固态廖　　复合材料的体积分数和各种各样的上海国际赛车场有限公司　　图中显示的是粒子曲线的趋势　　暗示了变形温度有一个　　对流动应力有显著的影响。观察表明,滑动和转动的　　谷物变硬。塑料,形成一个网络,固体颗粒接触　　互相联系,
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论文中英文翻译对照--通过注射成型制造压电陶瓷聚合物复合材料.doc17页
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毕业设计论文外文资料翻译
A. Safari and D. J. Waller, "Fine
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附 件: 1.外文资料翻译译文;2.外文原文。
附件1:外文资料翻译译文
通过注射成型制造压电陶瓷/聚合物复合材料
Leslie J. Bowen 和 Kenneth W. French
原料系统有限公司
摩洛哥康考德希尔克雷斯特大道53号, 邮编01742
宾夕法尼亚州立大学材料研究室的研究已经证明通过使用压电陶瓷/聚合物复合材料可以改进检漏器水诊器潜能。作为美国海军研究局的资助计划的一部分,旨在开发针对这些合成物且具有成本效益制造技术,材料系统正在寻求一种陶瓷制造方法的注射成型。本文简要概览了陶瓷注射成型过程的关键细节,并且记叙了制造压电陶瓷/聚合物复合材料的步骤及方法论。注射成型压电陶瓷的设备和应用程序都是区别于传统的材料的加工。
压电陶瓷/聚合物复合材料提供了设计的多功能性和性能优势,在遥感和驱动应用方面都超越单独的陶瓷与聚合物的压电材料。这些合成物已经被开始用于高解析度超声医学以及海军的发展应用。在过去的十三年里,许多复合的配置已经按照一个实验室的规模被构造且评估。其中最成功的组合之一,被指定复合物的纽纳姆号,有一个三维连接陶瓷阶段压电纤维内含三维连接有机聚合物的阶段。检漏器的性能系数可使得这个复合物超过那些通过适当选择阶段特征和复合结构的固体材料10000倍。
宾州州立大学复合物的制备是通过在一个跳汰机和封装环氧树脂中手调挤压压电陶瓷棒,之后限制适当的厚度并极化陶瓷。除了这种材料所展示出的性能优势,宾州州立大学的工作所凸显的问题涉及合成物的大规模制造或者甚至以原型为目
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