Surface patterned polymer micro-cantilever arrays for sensing
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Surface Modification
Micrometer
This paper presents the deflection characteristics of electrostatic actuators, which have shape modified electrodes and cantilevers. In order to investigate how to get a large deflection with a low voltage, various structures are examined by a numerical calculation. Maximum deflections, just before a cantilever is pulled into an electrode, are evaluated. The numerical analysis shows that the triangular electrode with a triangular cantilever gives large deflection with a low applied voltage. To realize the triangular cantilever, a novel fabrication process by a double exposure method is proposed. The experimental results show that the triangular like cantilevers have excellent performance for deflection characteristics, which agrees well with the calculation results.
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In this paper, the elastic behaviour in bending of three-layer plywood cantilever beams is analysed. Deflections of straight and half-circle cantilevers, loaded with a force at free end is determined experimentally and calculated using analytical and finite element method approach. The analytical calculation of deflection for the strait cantilever is obtained using a transformed cross section. The deflection of half-circle cantilever is determined by the classical laminated plate theory and Castigliano’s theorem. Loads and cantilever dimensions are varied in the study using the design of experiment. The deflection regression models for straight and semicircular plywood cantilevers are obtained from the experimental results. Analytically and numerically determined deflections of strait and half-circle cantilevers show very good agreement. Experimentally recorded deflections are approximately 30 % higher than analytical values. Stiffness properties and deflection values are influenced by direction of fibres in the outer layers of a three-layer plywood beam.
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In order to investigate the relationship between the thermal characteristics of the various molds as green sand mold, dry sand mold, mold and shell mold, and the solidification characteristics of molten metal, the thermal analysis of rarious molds and melt were performed. The structure of Al-Castings was a/so observed. Results obtained in this experiment were as follows : 1) The heating rate of the molds was increased in the order of green sand mold, mold, dry sand mold and shell mold, On the other hand the solidification time of the melts was shortened in the order of dry sand mold castings, mold castings, green sand mold castings and shell mold castings. 2) The arrest temperature period in the heating curve of the green sand mold was resulted from the eraporation of moisture contained in mold, which was transfered to the outer side of the mold. 3) The temperature fluctuation of the melt in the shell mold was considered to be resulted from the combution heat of resin contained in the mold. 4) The amounts of heat absorption of the molds were increased in the order of dry sand mold, mold, green sand mold and shell mold. 5) The higher the solidification rate was, the longer was its shrinkage pipe and the finer its grain size.
Shrinkage
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Dynamic mold temperature (DMT) injection molding is a molding process that the mold cavity is first rapidly heated to a high temperature before plastic melt injection, and then cooled quickly after filling and packing stages. With this technique, plastic parts with very good surface performance can be produced. However, as the special mold structure and its worse working process, large stress concentration can be caused in the mold. Consequently, the mold for this new injection technology can be easily fatigue and the lifetime of the mold is inevitably decreased. In this paper, the structure of the mold was presented first, and then the working process and factors influencing the lifetime of the mold were analyzed. Through numerical simulation, the fatigue source of the mold was evaluated. Results showed that the evaluation process presented in this paper was very in accordance with the practical failure mold.
Molding (decorative)
Transfer molding
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Virtual Cantilever Beam Method(VCBM) is presented,and analysis of deflection and rotational angle of beams is carried out using VCBM.Non-cantilever beams are translated into the Virtual Cantilever Beam using concept of deflection equivalent.General formulae of rotational angle and deflection were derived and the visualization method of bending displacement was presented.In comparison with other methods of calculating deflections,VCBM is easy to accomplish computerization and to plot deflection curves.Therefore,it is especially suitable for displacement visualization analysis of beams subjected to complex loads.
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In this review a detailed analysis of cantilever has been carried out, cantilevers are not more than a beam. Cantilevers are of various types; this classification is based on the connection of its both ends if it is connected from its one end while the other end is free to move then this type of cantilever is named as fixed-free cantilever. On the other hand if both ends are fixed then it is called fixed-fixed type of cantilevers. Numerous high resonant modes of cantilevers and its application in the field of science have been analyzed. An introduction to quantum dot concept and its incorporation to the cantilever have been shown and various applications of this technique are analyzed. A detailed overview of the fabrication process of the cantilever is discussed in this report. Fabrication of the micro and nano cantilevers has been discussed. The introduction to the quality factor of a cantilever is discussed to analyze the performance of a particular cantilever, a formula of quality factor has been shown and the effect of quality factor on the efficiency and rate of energy dissipation in a cantilever is analyzed.
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A study on the effect of curvature of cantilever MEMS is presented. A 3-D model is developed in ANSYS, the model presents the dynamic behavior of cantilever MEMS. Different types of geometrically configured cantilever MEMS are analyzed. The results include the variation of fundamental frequency and other higher natural frequencies with respect to curvature of cantilevers
Natural frequency
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