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Investigation on the magnetomechanical behavior of trilayered GM actuator

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Journal of Rare Earths 2008年第2期26卷 264-267页

作者： Heung-Shik Lee chongdu cho Department of Mechanical Engineering Inha University Yonghyun-dong Nam-ku Incheon 402-751 South Korea

In this article, it was suggested a TbFe/Co/Dy trilayered GM （Giant Magnetostrictive） film type actuator and investigated the magnetomechanical characteristics of the actuator for micro application. The trilayered films were fabricated at different thickness ratios to get an optimized structure. TbFe had positive GM properties, and cobalt, dysprosium layers made the magnetostriction property of composite film increase in low magnetic field. To fabricate the Si based microactuator with trilayered film, micromachining processes including RIE （Reactive Ion Etching） and selective DC magnetron sputtering techniques were combined. The deposited film thicknesses were measured by X-ray diffraction （XRD）. As a result, the magnetization of the film on the fabricated actuator was observed to characterize the magnetic properties of the TbFe/Co/Dy film using VSM （Vibrating Sample Magnetometer）. The magnetostriction of the actuator was determined by measuring the differences of curvature of the film coated silicon substrates using the optical cantilever method, and the deflections were also estimated under the external magnetic field lower than 0.5T for micro-system applications.

关键词： GM actuator magnetostriction trilayered film magnetron sputtering magnetization rare earths

Magnetostrictive Flexible Thin Film Structure for Micro Devices

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Journal of Rare Earths 2007年第S1期25卷 182-185页

作者： Heung-Shik Lee chongdu cho Department of Mechanical Engineering Inha University Yonghyun-dong Nam-kuIncheon 402-751 South Korea

Polyimide (Kapton, Dupont Corp.) based magnetostrictive thin film structures were designed and fabricated for micro device applications. In particular the growth of films on flexible substrates was studied to allow a simple integration of the system in miniaturized magnetostrictive devices. The films were fabricated on different substrates to compare their different magnetic and structural properties. It showed much more magnetostriction and higher impact resistance results compared with traditional Si based film type actuators. In the fabrication process, amorphous TbDyFe films with thicknesses of 500 nm, 1 μm, 1.5 μm respectively, were deposited on the designed substrate by DC magnetron sputtering. During sputtering process the substrate holder was maintained at room temperature. After the sputter process, X-ray diffraction studies were also carried out to determine the film structure and thickness of the sputtered film. At last, magnetization from VSM (Vibrating Sample Magnetometer) and magnetostriction from optical cantilever method of each structure were measured to estimate the magneto-mechanical characteristics under the external magnetic field lower than 0.7 T for micro-system applications.

关键词： magnetostrictive thin film micro device flexible polyimide substrate rare earths

Application of Taguchi Method in Parametric Study of Injection Molding of Display Front Panel

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材料科学与工程（中英文A版） 2011年第1X期1卷 123-131页

作者： Hyoungjun Moon Sang-kyo Lee Sang-youn Lee chongdu cho Department of Mechanical Engineering Inha University Korea

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SSI体系阻尼比实测及其分布规律研究

岩石力学与工程学报 2009年第3期28卷 641-648页

作者：张之颖李胜强谭高铭赵钟斗吕西林西安交通大学人居环境与建筑工程学院陕西西安710049 仁荷大学机械工学科韩国仁川402751 同济大学土木工程防灾国家重点实验室上海200092

阻尼比是结构动力分析的重要动力特性参数,目前规范采用的阻尼比是基于刚性地基或近似刚性地基的试验结果,未能考虑土与结构相互作用(SSI)效应。针对SSI效应问题,体系阻尼比的准确评估是其动力分析的重要前提。为了实现实际SSI体系阻尼... 详细信息

阻尼比是结构动力分析的重要动力特性参数,目前规范采用的阻尼比是基于刚性地基或近似刚性地基的试验结果,未能考虑土与结构相互作用(SSI)效应。针对SSI效应问题,体系阻尼比的准确评估是其动力分析的重要前提。为了实现实际SSI体系阻尼比值较准确的识别,提出环境激励下SSI体系阻尼比测试与识别方法,并应用这一识别方法,给出西安及其周围地区82幢各类SSI体系基本等效黏滞阻尼比的实测识别结果。同时在实测阻尼比数据的基础上,初步研究实际SSI体系阻尼比的总体分布规律、影响因素和取值范围。

关键词：结构力学阻尼比 SSI体系试验研究分布规律