Papers by Keyword: Young's Modulus

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Authors: Ming Chang, Juti Rani Deka, Chia Hung Lin, Chin Chung Chung
Abstract: One-dimensional (1D) nanostructure such as nanowires (NWs), nanobelts and nanorods have attracted tremendous attention in recent years due to their exceptional micro-structural properties and novel potential applications. In the present investigation, titania (TiO2) nanowires are synthesized by microwave hydrothermal process (MHP) treating TiO2 nano powder with NaOH inside a microwave oven for 5h at 210°C and 350W. The mechanical properties of as synthesized TiO2 nanowires are determined by bending it with a nanomanipulator inside a scanning electron microscope (SEM). Young’s moduli of the nanowires are measured to be approximately 11.870.923GPa.
Authors: Christopher Locke, G. Kravchenko, P. Waters, J. D. Reddy, K. Du, A.A. Volinsky, Christopher L. Frewin, Stephen E. Saddow
Abstract: Single crystal 3C-SiC films were grown on (100) and (111) Si substrate orientations in order to study the resulting mechanical properties of this material. In addition, poly-crystalline 3C-SiC was also grown on (100)Si so that a comparison with monocrystaline 3C-SiC, also grown on (100)Si, could be made. The mechanical properties of single crystal and polycrystalline 3C-SiC films grown on Si substrates were measured by means of nanoindentation using a Berkovich diamond tip. These results indicate that polycrystalline SiC thin films are attractive for MEMS applications when compared with the single crystal 3C-SiC, which is promising since growing single crystal 3C-SiC films is more challenging. MEMS cantilevers and membranes fabricated from a 2 µm thick single crystal 3C-SiC grown on (100)Si under similar conditions resulted in a small degree of bow with only 9 µm of deflection for a cantilever of 700 µm length with an estimated tensile film stress of 300 MPa. Single crystal 3C-SiC films on (111)Si substrates have the highest elastic and plastic properties, although due to high residual stress they tend to crack and delaminate.
Authors: Zhu Feng Li, Xiu Ping Xu, Yang Li, Liang Xiao Chen, Yang Dong Zhang
Abstract: In this article, a new dynamic measuring method of young modulus based on magnetics coupling and double raster has been thoroughly given. The test sampie has been thoroughly free oscillated so as to decreasing systematic error of normal experiment principle , by Electromagnetic energy uncontract coupling sample shake and by use of laser light beating to measuring micro shake. the schematic diagram and the measureing method of light beating micro shake has been given, so are computational formula of young modulus, experiment results, error analysis and results.
Authors: Atsumi Ohtsuki
Abstract: This paper describes a development of a new method (: Cantilever Method) to measure Young’s modulus of flexible materials. The method is based on a nonlinear deformation theory that takes into account large deformation behaviors. A set of testing devices was designed and machined. Measurements were carried out on two kinds of flexible materials (PVC: a high-polymer material and SWPA: a steel material). The modulus measured by this method is “Secant modulus”. The results of my evaluation confirm that the new method is suitable for flexible thin plates or rods. Based on the assessments made the method can be further applied to thin sheet and fiber materials (e.g., steel belt, glass fiber, carbon fiber, optical fiber, etc.).
Authors: Li Na Hao, Jian Chao Gao, Hont Tao L.
Abstract: The research is aimed at presenting a novel determination method of IPMC (Ionic Polymer Metal Composites) Young’s Modulus. This method would fill up some deficiencies, such as damaging the tested IPMC strip, having low precision and so on, in the traditional method like tensile test and bending test. The paper presents a novel determination method based on cantilever resonance theory. Cantilever resonance theory is one of the methods to determinate the Young’s modulus of metal wire and metal strip. This method adopts Euler-Bernoulli beam to build a vibration differential equation of the beam. Then, by using the separate variable method, the general solution of the equation would be obtained. Considering the boundary conditions, a formula about the relation of the Young’s modulus and the first natural frequency is obtained. Limited by the experimental equipment and test method, this method has not been applied in the composite material. This paper attempts to apply this method in the IPMC material. The laser probing DISP (displacement) technique is applied in the test experiment. The laser displacement transducer is a kind of accurate un-contact laser displacement measurement set. The distance measured, which could be used to measure the change in position of the tested object, is based on the triangle principle.
Authors: Xin Zhu Zhou, Jian Jun Zheng
Abstract: This paper presents a numerical method that can predict the Young’s modulus of ceramic with reasonable accuracy. By introducing periodic conditions, the distribution of pores in the matrix phase is simulated. The lattice model is then employed for the analysis of stress in the pore structure and for the determination of the maximum element length. Finally, the validity of the proposed numerical method is preliminarily verified with the experimental results obtained from the literature.
Authors: Zbigniew L. Kowalewski, Tadeusz Szymczak, Katarzyna Makowska, B. Augustyniak
Abstract: The paper presents relationships between strain level generated by creep process and two parameters determined form non-destructive tests, i.e. acoustic birefringence and amplitude of magnetoacoustic emission for three kinds of steel: 40HNMA, P91 and 13HMF. Moreover, the relationships between prior deformation level and selected mechanical parameters resulting from the standard tensile tests subsequently carried out at room temperature were established. As a consequence, this enabled to formulate mutual relationships between these mechanical parameters and parameters obtained from the ultrasonic/magnetic investigations.
Authors: Sang Joo Lee, Seung Min Hyun, Seung Woo Han, Hak Joo Lee, Jang Hyun Kim, Young Il Kim
Abstract: Mechanical behavior of small size materials has been explored due to many industry applications such as MEMs and semiconductors. The accurate measurements for mechanical properties of thin films are very challenge due to several technical difficulties. The proposed solution is the Visual Image Tracing (VIT) strain measurement system coupled with a micro tensile testing unit, which consists of a piezoelectric actuator, load cell, microscope and CCD cameras. This system has shown advantages of real time strain monitoring during the test and ability to measure the Young’s modulus, yiled strength and Poisson’s ratio of the material. Free standing Au films 0.5, 1 and 2 μm thick with average grain sizes of 104, 148 and 219 nm prepared by sputtering were studied using VIT system. The yield stresses of the films are dependent on film thickness and grain size.
Authors: Liviu Suciu, Adrian Botean, Mihaela Suciu, Victor Ros
Abstract: This paper presents the determination of longitudinal elasticity module or Young's modulus - E and Poisson's ratio - ν, for a desmopam membrane by Digital Image Correlation Method. These elements, together with the geometric characteristics, are input into the study of membrane by Finite Elements Method (FEM). Values deduced from measurements by Digital Image Correlation Method are convergent with those specified by the manufacturer, [.
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