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Dive into the research topics where Yoshiteru Aoyagi is active.

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Featured researches published by Yoshiteru Aoyagi.


Modelling and Simulation in Materials Science and Engineering | 2016

Heterogeneous plastic deformation and Bauschinger effect in ultrafine-grained metals: atomistic simulations

Tomohito Tsuru; Yoshiteru Aoyagi; Yoshiyuki Kaji; Tomotsugu Shimokawa

The effect of the dislocation density on yield strength and subsequent plastic deformation of ultrafine-grained metals was investigated in large-scale atomistic simulations. Polycrystalline models were constructed and uniaxial tension and compression were applied to elucidate the heterogeneous plastic deformation and the Bauschinger effect. The initial yield becomes heterogeneous as the dislocation density decreases owing to a wide range of Schmid factors of activated slip systems in each grain. A different mechanism of the Bauschinger effect was proposed, where the Bauschinger effect of ultrafine-grained metals is caused by the change in dislocation density in the process of forward and backward loadings.


IOP Conference Series: Materials Science and Engineering | 2017

Multiscale Crystal Plasticity Modeling Considering Nucleation of Dislocations Based on Thermal Activation Process on Ultrafine-grained Aluminum

Yoshiteru Aoyagi

In this study, a crystal plasticity model expressing the behavior of the dislocation source and the mobile dislocations is proposed by considering a thermal activation process of dislocations. In order to predict the variation of critical resolved shear stress due to grain boundaries, mobile dislocations, or dislocation sources, information on these crystal defects is introduced into a hardening law of crystal plasticity. The crystal orientation and shape of ultrafine-grained (UFG) aluminum produced by accumulative roll bonding processes are measured by electron backscatter diffraction (EBSD). Mechanical properties of the UFG aluminum are estimated using tensile test and indentation test. Results obtained by EBSD are introduced into a computational model. Finite element simulation for polycrystal of aluminum investigates the effect of microstructure on mechanical properties of UFG aluminum.


Key Engineering Materials | 2016

Macroscopic Yield Function Predicted by Crystal Plasticity Simulation on Ultrafine-Grained Aluminum

Yoshiteru Aoyagi

In this study, using experiment results obtained by electron backscatter diffraction, information on crystal orientation is introduced into a computational model for crystal plasticity simulation considering the effects of grain boundaries and dislocation sources to express the effect of the microstructure of ultrafine-grained metals. Finite-element simulations are performed for a polycrystal of an aluminum plate under biaxial tension. The multiscale crystal plasticity simulations depict the yield surface of the ultrafine-grained aluminum produced by accumulative roll-bonding processes. The anisotropic material coefficients of a higher-ordered yield function for ultrafine-grained aluminum are derived using a genetic algorithm.


International Journal of Plasticity | 2014

Crystal plasticity modeling and simulation considering the behavior of the dislocation source of ultrafine-grained metal

Yoshiteru Aoyagi; Tomohito Tsuru; Tomotsugu Shimokawa


International Journal of Plasticity | 2013

Modeling and simulation on ultrafine-graining based on multiscale crystal plasticity considering dislocation patterning

Yoshiteru Aoyagi; R. Kobayashi; Yoshiyuki Kaji; Kazuyuki Shizawa


Composites Part A-applied Science and Manufacturing | 2013

Prediction of failure properties of injection-molded short glass fiber-reinforced polyamide 6,6

Toshiki Sasayama; Tomonaga Okabe; Yoshiteru Aoyagi; Masaaki Nishikawa


Computational Materials Science | 2014

Phase-field simulation of static recrystallization considering nucleation from subgrains and nucleus growth with incubation period

Mayu Muramatsu; Yoshiteru Aoyagi; Yuichi Tadano; Kazuyuki Shizawa


Materials Transactions | 2013

Influence of Competition between Intragranular Dislocation Nucleation and Intergranular Slip Transfer on Mechanical Properties of Ultrafine-Grained Metals

Tomohito Tsuru; Yoshiteru Aoyagi; Yoshiyuki Kaji; Tomotsugu Shimokawa


Scripta Materialia | 2017

Heterogeneous nanostructure developed in heavily cold-rolled stainless steels and the specific mechanical properties

Hiromi Miura; Masakazu Kobayashi; Yoshikazu Todaka; Chihiro Watanabe; Yoshiteru Aoyagi; N. Sugiura; Naoki Yoshinaga


Mechanical Engineering Journal | 2014

Multiscale plasticity simulation considering spherulite structure of polypropylene

Yoshiteru Aoyagi; Atsushi Inoue; Toshiki Sasayama; Yoshinori Inoue

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Tomohito Tsuru

Japan Atomic Energy Agency

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Yoshiyuki Kaji

Japan Atomic Energy Agency

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Hiromi Miura

University of Electro-Communications

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Masakazu Kobayashi

Toyohashi University of Technology

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