Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids

Fang, Dai Ning; Zhao, Xu Jun; Pei, Yong Mao; Liu, Zhan Wei; Li, Fa Xin; Feng, Xue

doi:10.4028/www.scientific.net/KEM.326-328.5

Paper Titles

Committees

Preface

Nano and Micro Mechanical Measurement of Interaction Forces Between Solid Surfaces
p.1

Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids
p.5

Image Processing for Optical Methods to Analyze Shape, Deformation, Stress and Strain
p.13

Development of Phase Shifting Device Using the Deflection of a Cantilever for Digital Holography
p.19

Vibration Analysis of Membrane by Time Average In-Line Digital Holographic Interferometry
p.23

Effect of Phase-Shifting Error on Deformation Evaluation Using Phase-Shifting Digital Holography
p.27

Real-Time Shape Measurement by Unwrapping Method Using Aliasing
p.31

Home Key Engineering Materials Experimental Mechanics in Nano and BiotechnologyExperimental Study on Electro-Magneto-Mechanical...

Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids

Abstract:

New experiment systems that can offer electromechanical and electromagnetic coupling loads were established. Measurement skills and technologies under coupling loads have been developed. The experimental difficulties and technical problems, such as insulation, discharge, compressive testing of brittle ferroelectrics and so on, were well resolved. The constitutive experiments of piezo/ferroelectrics or ferromagnetic materials were carried out. Moiré Interferometry was applied to the measurement of transformation of the crack tip in ferroelectric ceramics under coupling loads. The deformation concentration near the internal electrode tip caused by non-uniform electric field was investigated by means of Digital Speckle Correlation Method (DSCM). With an aim to accomplish both measurements of constitutive response of the magnetostrictive materials and the fracture experiments of general soft ferromagnetic materials, a magnetomechanical-coupling testing setup was established, which is controlled by an industrial PC. The software was programmed to monitor the testing process and to deal with the acquired data. The characteristic curves of ferromagnetic materials, such as TbxDy1-xFe2 alloys, were measured, including the hysteresis loops, the magnetostriction curve and stress-strain curve.

Info:

Periodical:

Key Engineering Materials (Volumes 326-328)

Main Theme:

Experimental Mechanics in Nano and Biotechnology

Edited by:

Soon-Bok Lee and Yun-Jae Kim

Pages:

5-12

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.326-328.5

Citation:

D. N. Fang et al., "Experimental Study on Electro-Magneto-Mechanical Behaviour of Electromagnetic Solids", Key Engineering Materials, Vols. 326-328, pp. 5-12, 2006

Online since:

December 2006

Authors:

Dai Ning Fang, Xu Jun Zhao, Yong Mao Pei, Zhan Wei Liu, Fa Xin Li, Xue Feng

Keywords:

Electromechanical Coupling, Ferroelectric Materials, Magnetomechanical Coupling, Measurement

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Paper TitlePages

Effect of Residual Stresses on Mechanical Properties of Duplex Stainless Steel Studied by Diffraction and Self-Consistent Modelling

Authors: Rim Dakhlaoui, Chedly Braham, Andrzej Baczmanski, Sebastian Wroński, Krzysztof Wierzbanowski, E.C. Oliver

Abstract: The aim of this work is to study the influence of residual stresses on the properties of textured duplex stainless steel (DSS). The properties of both phases in DSS were studied using Xray diffraction whilst external load was applied “in situ” to the sample. The interpretation of experimental data is based on the diffraction elastic constants calculated by the self-consistent model taking into account the anisotropy of the studied material. Carrying out measurements in both compression and tension by using neutron diffraction, important differences in the evolution of lattice strains were noticed. An elastoplastic model is used to predict the evolution of the internal stresses during loading and to identify critical resolved shear stresses and strain hardening parameters of the material. The influence of the initial residual stresses on the yield stresses of the phases is considered. The difference between tensile and compressive behaviour of the steel is explained when the initial stresses (measured in the as received non-loaded sample by diffraction methods) are taken into account in model calculations. The yield stresses in each phase of the studied steel have been experimentally determined and successfully compared with the results of the elastoplastic self-consistent model.

185

Evolution of Internal Stress and Influence on Dielectric Properties by Number of Dielectric Layers in MLCC

Authors: Satoshi Yokomizo, Takuya Hoshina, Hiroaki Takeda, Katsuya Taniguchi, Youichi Mizuno, Hirokazu Chazono, Osamu Sakurai, Takaaki Tsurumi

Abstract: We researched the phenomenon that the permittivity of dielectric layers in multilayer ceramic capacitor (MLCC) increases with the number of dielectric layers. Finite element method (FEM) shows that the internal residual stress in MLCC was generated by the difference of thermal expansion coefficient between internal electrodes and dielectric layers. We developed a electric measurement system with applying external stress for understanding the stress influence on dielectric properties. The compressive stress along electric field increased the polarization. The polar nano regions (PNRs) in shell composition dielectrics were easily influenced by stress. Based on these results, the relationship between the number of dielectric layers and their permittivity in MLCCs was explained.

Surface Yield Strength Gradient versus Residual Stress Relaxation of 7075 Aluminum Alloy

Authors: Yong Hui Hu, Yun Xin Wu, Guang Yu Wang, Jun Kang Guo

Abstract: Different distributed residual stresses were introduced by quenching and two shot-peening treatments on 7075 aluminum alloy. The residual stress distributions and micro-hardness profiles in surface layers were measured. Pre-stress coefficient characterizing contribution of local residual stresses to local yield strength is introduced to analyze residual stress relaxation under cyclic loading. Load testing shows that re-distribution of residual stresses and proportional decrease of the pre-stress coefficient would occur in the non-uniform structural residual stresses introduced by quenching, while great stress relaxation and non-linear decrease of the pre-stress coefficient would occur in the uniform surface residual stresses introduced by shot-peening. Additionally, advantages of surface compressive residual stress and micro yield strength on anti-fatigue property and on restraining initiation and propagation of surface micro cracks should be considered in the usually conservative engineering design.

241

Research on Relationship between Residual Stress of Hole Cold Expansion and Process Parameter

Authors: Hong Shuang Zhang

Abstract: The hole cold expansion is a well-known technique used to improve the fatigue life in mechanical structures. An approach named simulation experiment was used to establish the relationships between maximum residual stress and the process parameters in order to quantitatively understand residual stress status around the hole after expansion working. Firstly, Finite Element Method was employed to substitute the physical experiments to get the residual stress distribution of the hole of different expansion ratios, hole diameters and plate heights. Secondly, Excel software was used to obtain the trend curves of maximum residual compressive stress of different parameters. Then the equations of trend curves were obtained based on the least square principle. The results show that the simulation experiment approach is practical to implement and meet the actual accuracy need of engineering, and could establish the foundation for analysis of the fatigue life in mechanical structures.

373

Experimental Study on the Compressive Mechanical Performance of Bamboo Strip Plywood under Static Loads

Authors: Wen Qing Wu, Xue Yuan Ma, Shuai Chen

Abstract: The compressive mechanical performance of bamboo strip plywood was studied in the paper. Based on analysis of the related experiments datum , the principal compressive mechanical performance under static load were expounded perfectly, and a number of mechanical parameters such as compressive strength, compressive elastic modulus and compressive constitutive relations were obtained. It was shown that the mechanical performance of bamboo strip plywood was better than that of wood material such as Northeast larch, the compressive elastic modulus was lower than that of concrete, so that there existed a more great deformation when the bamboo beam structure was loaded, and the constitutive relations of bamboo materials showed that there was excellent ductility with an obvious characteristic of plastic deformation . This research result showed that there was a great significance on studying and application of bamboo bridges in the future.

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