On the Possibility of Developing Magnetostrictive Fe-Co/Ni Clad Plate with Both Vibration Energy Harvesting and Mass Sensing Elements
Mori; K. Wang; Y. Katabira; K. Neyama; D. Onodera; R. Chiba; D. Watanabe; M. and Narita; F, 筆頭著者, The severe acute respiratory syndrome coronavirus (SARS-CoV-2) has spread rapidly around the world. In order to prevent the spread of infection, city blockades and immigration restrictions have been introduced in each country, but these measures have a severe serious impact on the economy. This paper examines the possibility of both harvesting vibration energy and detecting mass by using a magnetostrictive alloy. Few efforts have been made to develop new magnetostrictive biosensor materials. Therefore, we propose magnetostrictive Fe-Co/Ni clad steel vibration energy harvesters with mass detection, and we numerically and experimentally discuss the effect of the proof mass weight on the frequency shift and output voltage induced by bending vibration. The results reveal that the frequency and output voltage decrease significantly as the mass increases, indicating that the energy harvesting device is capable of mass detection. In the future, device miniaturization and the possibility of virus detection will be considered., MDPI AG
Materials, 2021年08月10日, ［査読有り］

Evaluation of the Axial Force in an FeCo Bolt using the Inverse Magnetostrictive Effect　　　　　　　　　　　　　　　
Mori; K. Horibe; T. and Maejima; K, 筆頭著者
Measurement, 2020年07月04日, ［査読有り］

はりの大たわみの近似式に基づくヤング率測定法（片持ちはりおよび3点曲げの場合）　　　　　　　　　　　　　　　
ばね論文集, 2020年06月, ［査読有り］

大たわみに基づくヤング率および摩擦係数の同時同定法　　　　　　　　　　　　　　　
ばね論文集, 2020年06月, ［査読有り］

Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites
Zhenjin Wang; Kotaro Mori; Kenya Nakajima; Fumio Narita, Magnetostrictive materials have a wide variety of applications due to their great capability as sensors and energy-harvesting devices. However, their brittleness inhibits their applications as magnetostrictive devices. Recently, we developed a continuous magnetostrictive Fe-Co-fiber-embedded epoxy matrix composite to increase the flexibility of the material. In this study, we fabricated random magnetostrictive Fe-Co short fiber/epoxy composite sheets. It was found that the discontinuous Fe-Co fiber composite sheet has the magnetostrictive properties along the orientation parallel to the length of the sheet. Finite element computations were also carried out using a coupled magneto-mechanical model, for the representative volume element (RVE) of unidirectional aligned magnetostrictive short fiber composites. A simple model of two-dimensional, randomly oriented, magnetostrictive short fiber composites was then proposed and the effective piezomagnetic coefficient was determined. It was shown that the present model is very accurate yet relatively simple to predict the piezomagnetic coefficient of magnetostrictive short fiber composites. This magnetostrictive composite sheet is expected to be used as a flexible smart material., MDPI AG
Materials, 2020年03月25日, ［査読有り］

Effect of Weight on the Resonant Tuning of Energy Harvesting Devices Using Giant Magnetostrictive Materials
Mori; K. Horibe; T. and Ishikawa; S, This study deals with the numerical and experimental study of the effect of weight on the resonant tuning and energy harvesting characteristics of energy harvesting devices using giant magnetostrictive materials. The energy harvesting device is made in a cantilever shape using a thin Terfenol-D layer, stainless steel (SUS) layer and a movable proof mass, among other things. In this study, two types of movable proof mass were prepared, and the device was designed to adjust its own resonant frequency automatically to match external vibration frequency in real time. Three-dimensional finite element analysis (FEA) was performed, and the resonant frequency, tip displacement, and output voltage in the devices were predicted and measured, and the simulation and experiment results were compared. The effects of the weight of the proof mass on self-tuning ability and time-varying behavior were then considered in particular., MDPI AG
Materials, 2018年04月10日, ［査読有り］

Large Deflection of Tapered Cantilever Beams Made of Axially Functionally Graded Material　　　　　　　　　　　　　　　
Horibe, T; Mori, K
Mechanical Engineering Journal, 2018年01月10日, ［査読有り］

Potential of Energy Harvesting in Barium Titanate Based Laminates from Room Temperature to Cryogenic/High Temperatures: Measurements and Linking Phase Field and Finite Element Simulations
Narita; F. Fox; M. Mori; K. Takeuchi; H. Kobayashi T. and Omote; K, This paper studies the energy harvesting characteristics of piezoelectric laminates consisting of barium titanate (BaTiO3) and copper (Cu) from room temperature to cryogenic/ high temperatures both experimentally and numerically. First, the output voltages of the piezoelectric BaTiO3/Cu laminates were measured from room temperature to a cryogenic temperature (77 K). The output power was evaluated for various values of load resistance. The results showed that the maximum output power density is approximately 2240 nW cm(-3). The output voltages of the BaTiO3/Cu laminates were also measured from room temperature to a higher temperature (333 K). To discuss the output voltages of the BaTiO3/Cu laminates due to temperature changes, phase field and finite element simulations were combined. A phase field model for grain growth was used to generate grain structures. The phase field model was then employed for BaTiO3 polycrystals, coupled with the time-dependent Ginzburg-Landau theory and the oxygen vacancies diffusion, to calculate the temperature-dependent piezoelectric coefficient and permittivity. Using these properties, the output voltages of the BaTiO3/Cu laminates from room temperature to both 77 K and 333 K were analyzed by three dimensional finite element methods, and the results are presented for several grain sizes and oxygen vacancy densities. It was found that electricity in the BaTiO3 ceramic layer is generated not only through the piezoelectric effect caused by a thermally induced bending stress but also by the temperature dependence of the BaTiO3 piezoelectric coefficient and permittivity., IOP PUBLISHING LTD
Smart Materials and Structures, 2017年10月23日, ［査読有り］

Three-Point Bending Fatigue of Cracked Giant Magnetostrictive Materials under Magnetic Fields　　　　　　　　　　　　　　　
Narita; F. Shikanai; K. Shindo, Y; Mori, K
Acta Mechanica, 2017年06月25日, ［査読有り］

Effect of the Loading Rate on the Brittle Fracture of Terfenol-D Specimens in Magnetic Field: Strain Energy Density Approach
M. Colussi; F. Berto; K. Mori; F. Narita, The aim of the present study is to characterize the fracture behavior of the giant magnetostrictive Terfenol-D alloy, both experimentally and numerically. Three-point bending tests have been carried out on single-edge precracked specimens, and fracture loads have been measured at different loading rates, in the presence or absence of a magnetic field. In recent years, it has been shown that the strain energy density (SED), averaged in a finite control volume, can successfully predict brittle failures of cracked, U- and V-notched specimens made of several materials. By performing coupled-field finite element analyses, the effects of the magnetic field and he loading rate on Terfenol-D failures have been analyzed, and the capability of SED criterion to capture these effects has been discussed. A relationship between the SED control volume size and the loading rate has been proposed, and failures have been quite accurately predicted in terms of the averaged SED., SPRINGER
STRENGTH OF MATERIALS, 2016年11月, ［査読有り］

Stresses Around an Eccentric Hole in an Infinite strip Subjected to In-Plane Bending
Horibe; T. Sakurai; K. Arai, Y; Mori, K, In this paper, we present an analytical solution for an infinite strip having an eccentric circular hole when the strip is subjected to in-plane bending at infinity. The analysis is based on the Papkovich-Neuber displacement potentials and the solution is obtained by a proper combination of harmonic function in integral forms and infinite series. The boundary conditions on both sides of the strip and around the hole are satisfied using the relations between the Cartesian and polar harmonics. The numerical results obtained are compared with those of FEM. A detailed stresses around the eccentric hole are illustrated for the various size of the eccentricity and the hole radius., The Japan Society of Mechanical Engineers
Mechanical Engineering Journal, 2015年08月03日, ［査読有り］

Dynamic Electromagneto-mechanical Behavior of Clamped-Free Giant Magnetostrictive/Piezoelectric Laminates under AC Electric Fields　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
Smart Materials and Structures, 2012年, ［査読有り］

Electromagneto-mechanical Behavior of Giant Magnetostrictive/Piezoelectric Laminates in Three-Point Bending under Electric Fields　　　　　　　　　　　　　　　
Yasuhide Shindo; Yuzo Kori; Kotaro Mori; Fumio Narita
Advances in Theoretical and Applied Mechanics, 2012年, ［査読有り］

Electromagneto-mechanical Fields of Giant Magnetostrictive/Piezoelectric Laminates under Concentrated Load　　　　　　　　　　　　　　　
Yasuhide Shindo; Yuzo Kori; Kotaro Mori; Fumio Narita
International Journal of Smart and Nano Materials, 2012年, ［査読有り］

Electromagneto-mechanical Behavior of Giant Magnetostrictive/Piezoelectric Laminates under Electric Fields for Self-Sensing Cantilever Actuator　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
Journal of Solid Mechanics and Materials Engineering, 2011年, ［査読有り］

Effect of Electric Field on the Response of Clamped-Free Magnetostrictive/Piezoelectric/Magnetostrictive Laminates
Kotaro Mori; Fumio Narita; Yasuhide Shindo, This work deals with the response of clamped-free magnetostrictive/piezoelectric/magnetostrictive laminates under electric field both numerically and experimentally. The laminate is fabricated using two magnetostrictive Terfenol-D layers and a soft piezoelectric PZT layer. Easy axis of Terfenol-D layers is length direction, while the polarization of PZT layer is the thickness direction. The magnetostriction of the Terfenol-D layers bonded to the upper and lower surfaces of the PZT layer is first measured. Next, a nonlinear finite element analysis is employed to evaluate the second-order magnetoelastic constants in the Terfenol-D layers bonded to the PZT layer using measured data. The induced magnetic field and internal stresses for the laminates under electric field parallel to the poling are then calculated and discussed in detail. In addition, the induced magnetic field is measured, and test results are presented to validate the predictions., TECH SCIENCE PRESS
Computers, Materials & Continua, 2011年, ［査読有り］

Electromagneto-mechanical Fields of Giant Magnetostrictive/Piezoelectric Laminates　　　　　　　　　　　　　　　
Yasuhide Shindo; Kotaro Mori; Fumio Narita
Acta Mechanica, 2010年, ［査読有り］

Nonlinear Bending Response of Giant Magnetostrictive Laminated Actuators in Magnetic Fields
Yasuhide Shindo; Fumio Narita; Kotaro Mori; Tasuku Nakamura, We report numerical and experimental investigations into the nonlinear bending behavior of magnetostrictive laminated actuators under magnetic fields. Magnetostrictive actuators were fabricated from thin layers of Terfenol-D and metal, and the magnetostriction of the devices was measured. A nonlinear finite element analysis was employed to evaluate the contribution of magnetic domain switching to the second-order magnetoelastic constants in the Terfenol-D layer. The effect of a magnetic field on the nonlinear deflection and internal stress of magnetostrictive laminated actuators is discussed., MATHEMATICAL SCIENCE PUBL
Journal of Mechanics of Materials and Structures, 2009年, ［査読有り］

繰返し曲げを受ける超磁歪/圧電積層カンチレバーの感知・応答特性　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生,大倉宗
第25回「電磁力関連のダイナミクス」シンポジウム, 2013年05月

集中荷重を受ける超磁歪/圧電積層カンチレバーの感知・応答特性　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生
日本機械学会東北支部第48期総会・講演会, 2013年03月

Detection and Response Characteristics of Clamped-Free Giant Magnetostrictive/Piezoelectric Laminates under Bending　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
Excellent Graduate Schools 2012 Annual Students Research Presentation, 2013年03月

交流電場下における片持ち超磁歪／圧電積層材料の動的曲げ　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生
日本機械学会東北支部第48期秋季講演会, 2012年09月

Bending Response of Giant Magnetostrictive/Piezoelectric Laminated Cantilevers under Concentrated Loads　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
2012 Joint Symposium Materials Science and Engineering for the 21st Century, 2012年06月

集中荷重を受ける超磁歪／圧電積層材料の電磁力学場　　　　　　　　　　　　　　　
桑折友三,進藤裕英,森孝太郎,成田史生
第55回日本学術会議材料工学連合講演会, 2011年10月

超磁歪/圧電/超磁歪積層材料の応答特性に及ぼす電場の影響　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生
第60回理論応用力学講演, 2011年03月

Nonlinear Bending Behavior of Terfenol-D/PZT Laminated Composites under DC and AC Electric Fields　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
平成22年度若手研究者研究報告会, 2011年03月

Nonlinear Electromagneto-mechanical Behavior of Giant Magnetostrictive/Piezoelectric Laminated Composites under AC Electric Fields　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
KINKEN-WAKATE 2010, 2010年12月

電磁場下における超磁歪／圧電積層デバイスの感知・応答特性　　　　　　　　　　　　　　　
成田史生,森孝太郎,進藤裕英
日本機械学会2010年度年次大会, 2010年09月

Effect of Electric Field on the Bending Behavior of Terfenol-D/PZT Laminated Devices　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
The 4th IMR/Korea University Student Exchange Seminar, 2010年08月

Nonlinear Bending Behavior of Magnetostrictive/Piezoelectric Laminated Devices under Electric Fields　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
Joint Symposium on the MSE for the 21st Century 2010 DAEJEON, 2010年06月

電場下における超磁歪/圧電積層デバイスの非線形曲げ挙動　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生
第22回「電磁力関連のダイナミクス」シンポジウム, 2010年05月

Effect of Electric Field on the Bending Response of Magnetostrictive/Piezoelectric Laminated Composites　　　　　　　　　　　　　　　
Kotaro Mori; Fumio Narita; Yasuhide Shindo
International Symposium on Aircraft Materials 2010, 2010年05月

電磁場下における超磁歪／圧電積層デバイスの非線形曲げ挙動　　　　　　　　　　　　　　　
成田史生,進藤裕英,森孝太郎
日本金属学会2010年春期（第146回）大会, 2010年03月

Nonlinear Bending Response of Terfenol-D/PZT Laminated Devices under Electromagnetic Fields　　　　　　　　　　　　　　　
Kotaro Mori; Fumio Narita; Yasuhide Shindo
SPIE 17th Annual International Symposium on Smart Structures/NDE, 2010年03月

超磁歪/圧電積層デバイスの電磁力学場　　　　　　　　　　　　　　　
森孝太郎,成田史生,進藤裕英
日本機械学会2009年度年次大会, 2009年09月

Nonlinear Bending Response of Terfenol-D/PZT Laminated Devices under Magnetic Fields　　　　　　　　　　　　　　　
Kotaro Mori; Yasuhide Shindo; Fumio Narita
Joint Symposium on Materials Science and Engineering for the 21st Century 2009 KYOTO, 2009年09月

磁場内における超磁歪積層アクチュエータの非線形曲げ応答　　　　　　　　　　　　　　　
森孝太郎,進藤裕英,成田史生
第21回「電磁力関連のダイナミクス」シンポジウム, 2009年05月

Effect of Magnetic Field on the Bending Response of Magnetostrictive/Piezoelectric Laminated Actuators　　　　　　　　　　　　　　　
Fumio Narita; Yasuhide Shindo; Kotaro Mori
SPIE 16th Annual International Symposium on Smart Structures/NDE, 2009年03月