Akihiro Nakatani | Osaka University (original) (raw)
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Universiti Pertahanan Nasional Malaysia
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Papers by Akihiro Nakatani
The Proceedings of The Computational Mechanics Conference, 2019
A lattice defect model of kink deformation in magnesium alloywith LPSO structure is proposed from... more A lattice defect model of kink deformation in magnesium alloywith LPSO structure is proposed from the point of view of anequivalence of wedge disclinations dipole and edge dislocationarray. Then, an interaction between isolated dislocation (withdifferent positions) and kink boundary (with different models) isstudied. The results show that, based on disclinations model thecoarse-graining is effective when consider the statisticalaverage situation, and the model that explicitly deals with locallattice defect structure can effectively discuss elementaryprocess of microscopic phenomenon. We also give the results of the configurational force on variouskind of lattice defect. It is well-known that the Peach-Koehlerforce on dislocation, which is a typical configurational force,is closely related with the strength of the material. Theconfigurational force on disclination is formulated. We discussthe possibility to do multiscale analysis which is related to theestimation of the strength...
Spatially localized vibration modes in bcc model crystals are investigated numerically. Spatially... more Spatially localized vibration modes in bcc model crystals are investigated numerically. Spatially discreteness of crystal and nonlinearity of atomic interaction support the existence of these localized modes. We construct a hybrid computation method of the molecular dynamics simulation and the iteration method for finding periodic orbit in the phase space. Using the constructed method, we find two types of stationary localized modes in the bcc model crystal: bond-center modes and site-center modes. Frequency of these mode is out of the dispersion band. Structure of these modes in 3D crystal is investigated in detail.
The Proceedings of Conference of Kansai Branch, 2020
The Proceedings of the Materials and Mechanics Conference, 2019
The Proceedings of Conference of Kansai Branch, 2018
The Reference Collection of Annual Meeting, 2009
The Reference Collection of Annual Meeting, 2008
The Proceedings of the Materials and Mechanics Conference, 2014
Micropolar theory ， one of the generalized continuum mechanics theories， is characterized by rota... more Micropolar theory ， one of the generalized continuum mechanics theories， is characterized by rotational degrees of freedom 夢， which are independent frQm displacepent u ， In this study ， we apply micropolar
The Proceedings of the Materials and Mechanics Conference, 2011
Asound bullet is a high −energy area formed by elastic waves through non −linear acoustic ］ ens (... more Asound bullet is a high −energy area formed by elastic waves through non −linear acoustic ］ ens (Spadoni and Daraio ， 2010) ． In this stUdy ， simulations of wave propagation in an elastic body are caried out to obtain the characteristics of sound bullet for improvement of acoustic lens ． Effect of bou皿 dary profile is血 vestigated．
The Proceedings of Conference of Kansai Branch, 2016
The Proceedings of Conference of Kansai Branch, 2014
The Proceedings of Conference of Kansai Branch, 2012
The Proceedings of Conference of Kansai Branch, 2011
The Proceedings of Conference of Kansai Branch, 2003
The Proceedings of Conference of Kansai Branch, 2003
The Proceedings of The Computational Mechanics Conference, 2014
The Proceedings of The Computational Mechanics Conference, 2014
The Proceedings of The Computational Mechanics Conference, 2011
The Proceedings of The Computational Mechanics Conference, 2019
A lattice defect model of kink deformation in magnesium alloywith LPSO structure is proposed from... more A lattice defect model of kink deformation in magnesium alloywith LPSO structure is proposed from the point of view of anequivalence of wedge disclinations dipole and edge dislocationarray. Then, an interaction between isolated dislocation (withdifferent positions) and kink boundary (with different models) isstudied. The results show that, based on disclinations model thecoarse-graining is effective when consider the statisticalaverage situation, and the model that explicitly deals with locallattice defect structure can effectively discuss elementaryprocess of microscopic phenomenon. We also give the results of the configurational force on variouskind of lattice defect. It is well-known that the Peach-Koehlerforce on dislocation, which is a typical configurational force,is closely related with the strength of the material. Theconfigurational force on disclination is formulated. We discussthe possibility to do multiscale analysis which is related to theestimation of the strength...
Spatially localized vibration modes in bcc model crystals are investigated numerically. Spatially... more Spatially localized vibration modes in bcc model crystals are investigated numerically. Spatially discreteness of crystal and nonlinearity of atomic interaction support the existence of these localized modes. We construct a hybrid computation method of the molecular dynamics simulation and the iteration method for finding periodic orbit in the phase space. Using the constructed method, we find two types of stationary localized modes in the bcc model crystal: bond-center modes and site-center modes. Frequency of these mode is out of the dispersion band. Structure of these modes in 3D crystal is investigated in detail.
The Proceedings of Conference of Kansai Branch, 2020
The Proceedings of the Materials and Mechanics Conference, 2019
The Proceedings of Conference of Kansai Branch, 2018
The Reference Collection of Annual Meeting, 2009
The Reference Collection of Annual Meeting, 2008
The Proceedings of the Materials and Mechanics Conference, 2014
Micropolar theory ， one of the generalized continuum mechanics theories， is characterized by rota... more Micropolar theory ， one of the generalized continuum mechanics theories， is characterized by rotational degrees of freedom 夢， which are independent frQm displacepent u ， In this study ， we apply micropolar
The Proceedings of the Materials and Mechanics Conference, 2011
Asound bullet is a high −energy area formed by elastic waves through non −linear acoustic ］ ens (... more Asound bullet is a high −energy area formed by elastic waves through non −linear acoustic ］ ens (Spadoni and Daraio ， 2010) ． In this stUdy ， simulations of wave propagation in an elastic body are caried out to obtain the characteristics of sound bullet for improvement of acoustic lens ． Effect of bou皿 dary profile is血 vestigated．
The Proceedings of Conference of Kansai Branch, 2016
The Proceedings of Conference of Kansai Branch, 2014
The Proceedings of Conference of Kansai Branch, 2012
The Proceedings of Conference of Kansai Branch, 2011
The Proceedings of Conference of Kansai Branch, 2003
The Proceedings of Conference of Kansai Branch, 2003
The Proceedings of The Computational Mechanics Conference, 2014
The Proceedings of The Computational Mechanics Conference, 2014
The Proceedings of The Computational Mechanics Conference, 2011