Search Results - "Jun Koyanagi"

Residual strength prediction for unidirectional CFRP using a nonlinear viscoelastic constitutive equation considering entropy damage by Sato, Mio, Hasegawa, Kodai, Koyanagi, Jun, Higuchi, Ryo, Ishida, Yuichi

“…We propose a viscoelastic/plastic constitutive equation for viscoelastic media based on irreversible thermodynamics and the viscoelastic theory. Uniaxial…”
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Micro-Scale Numerical Simulation of Fatigue Failure for CFRP Subjected to Multiple-Amplitude Cyclic Loadings Based on Entropy Damage Criterion by Deng, Huachao, Toda, Keitaro, Sato, Mio, Koyanagi, Jun

“…Fatigue failure of carbon fiber-reinforced plastics (CFRPs) under cyclic loadings has attracted the attention of researchers recently. In this study, the…”
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A Possibility for Quantitative Detection of Mechanically-Induced Invisible Damage by Thermal Property Measurement via Entropy Generation for a Polymer Material by Sakai, Takenobu, Takase, Naohiro, Oya, Yutaka, Koyanagi, Jun

“…Entropy generation from a mechanical and thermal perspective are quantitatively compared via molecular dynamic (MD) simulations and mechanical and thermal…”
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Enhanced Estimation of Axial Compressive Strength for CFRP Based on Microscale Numerical Simulation and the Response Surface Method by Yoshida, Honoka, Deng, Huachao, Koyanagi, Jun

“…Compressive strength is one of the most important properties of carbon fiber reinforced plastics (CFRP). In this study, a new method for predicting the axial…”
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A Molecular Dynamics Simulation for Thermal Activation Process in Covalent Bond Dissociation of a Crosslinked Thermosetting Polymer by Yamada, Naoki, Oya, Yutaka, Kato, Nobuhiko, Mori, Kazuki, Koyanagi, Jun

“…A novel algorithm for covalent bond dissociation is developed to accurately predict fracture behavior of thermosetting polymers via molecular dynamics…”
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Evaluation of True Bonding Strength for Adhesive Bonded Carbon Fiber-Reinforced Plastics by Takamura, Maruri, Isozaki, Minori, Takeda, Shinichi, Oya, Yutaka, Koyanagi, Jun

“…Carbon fiber-reinforced thermoplastics (CFRTPs) have attracted attention in aerospace because of their superior specific strength and stiffness. It can be…”
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Durability Analysis of CFRP Adhesive Joints: A Study Based on Entropy Damage Modeling Using FEM by Li, Yutong, Deng, Huachao, Takamura, Maruri, Koyanagi, Jun

“…Experimental methodologies for fatigue lifetime prediction are time-intensive and susceptible to environmental variables. Although the cohesive zone model is…”
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Evaluation of interface properties of carbon fiber/resin using the full atomistic model considering the electric charge state by Kasahara, Shohei, Koyanagi, Jun, Mori, Kazuki, Yabe, Makoto

“…Evaluation of interface strength is important in composite material design such as carbon fiber reinforced plastic. Molecular simulation, which considers…”
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Evaluation of Microscopic Damage of PEEK Polymers under Cyclic Loadings Using Molecular Dynamics Simulations by Iwamoto, Shun, Oya, Yutaka, Koyanagi, Jun

“…Full-atomic molecular dynamics simulations were conducted to investigate the time evolution of microscopic damage in polyetheretherketone (PEEK) polymers under…”
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Molecular Dynamics Simulation for Evaluating Fracture Entropy of a Polymer Material under Various Combined Stress States by Takase, Naohiro, Koyanagi, Jun, Mori, Kazuki, Sakai, Takenobu

“…Herein, the stress-state dependence of fracture entropy for a polyamide 6 material is investigated through molecular dynamics simulations. Although previous…”
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The decoupling electrical and thermal conductivity of fullerene/polyaniline hybrids reinforced polymer composites by Cheng, Xiuyan, Yokozeki, Tomohiro, Yamamoto, Michihiro, Wang, Haopeng, Wu, Lixin, Koyanagi, Jun, Sun, Qingfu

“…Hybrid nanoparticles, fullerene (C60) and polyaniline (PANI), were incorporated into the polydivinylbenzene (PDVB), and their decoupling effect of electrical…”
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Numerical simulation for strain rate and temperature dependence of transverse tensile failure of unidirectional carbon fiber-reinforced plastics by Sato, Mio, Shirai, Sakie, Koyanagi, Jun, Ishida, Yuichi, Kogo, Yasuo

“…In the present study, strain-rate and temperature dependence of the transverse tensile failure mode of unidirectional heat-resistant carbon fiber-reinforced…”
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Effect of Electrostatic Interactions on the Interfacial Energy between Thermoplastic Polymers and Graphene Oxide: A Molecular Dynamics Study by Morita, Mayu, Oya, Yutaka, Kato, Nobuhiko, Mori, Kazuki, Koyanagi, Jun

“…In this study, the atomistic-scale mechanisms affecting the interfacial stability of a thermoplastic polymer/graphene oxide interface are investigated using…”
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Fabrication of well-isolated graphene and evaluation of thermoelectric performance of polyaniline–graphene composite film by Ube, Takuji, Koyanagi, Jun, Kosaki, Takahiro, Fujimoto, Kenjiro, Yokozeki, Tomohiro, Ishiguro, Takashi, Nishio, Keishi

“…Camphorsulfonic acid (CSA)-doped polyaniline (PANI) and thermally reduced graphene (TRGO) composite polymer film with high thermoelectric (TE) properties were…”
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Numerical and Experimental Studies for Fatigue Damage Accumulation of CFRP Cross-Ply Laminates Based on Entropy Failure Criterion by Deng, Huachao, Mochizuki, Asa, Fikry, Mohammad, Abe, Shun, Ogihara, Shinji, Koyanagi, Jun

“…The transverse cracking behavior of a carbon-fiber-reinforced plastic (CFRP) cross-ply laminate is investigated using a fatigue test and an entropy-based…”
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Temperature dependence of interfacial strength of carbon-fiber-reinforced temperature-resistant polymer composites by Sato, Mio, Koyanagi, Jun, Lu, Xin, Kubota, Yuki, Ishida, Yuichi, Tay, T.E.

“…In the present study, the temperature-dependence of fiber/matrix interfacial strength is discussed through temperature-controlled microbond testing and its…”
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Investigation of combined stress state failure criterion for glass fiber/epoxy interface by the cruciform specimen method by Ogihara, Shinji, Koyanagi, Jun

“…The interfacial failure criterion under combined stress state in a glass fiber/epoxy composite is investigated by the cruciform specimen method. Experiments…”
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The enhancement effect of carbon-based nano-fillers/polyaniline hybrids on the through-thickness electric conductivity of carbon fiber reinforced polymer by Cheng, Xiuyan, Yokozeki, Tomohiro, Wu, Lixin, Koyanagi, Jun, Wang, Haopeng, Sun, Qingfu

“…Overall goal of this research is to study the conductivity enhancement effect and its mechanism for different types of carbon-based nano-fillers/conduct…”
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Numerical Simulation for Durability of a Viscoelastic Polymer Material Subjected to Variable Loadings Fatigue Based on Entropy Damage Criterion by Li, Yutong, Fikry, M J Mohammad, Koyanagi, Jun

“…This study aims to explore the impact of load history on the premature failure of the viscoelastic polymer matrix in carbon-fiber-reinforced plastics (CFRPs)…”
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Molecular dynamics simulation for the quantitative prediction of experimental tensile strength of a polymer material by Koyanagi, Jun, Takase, Naohiro, Mori, Kazuki, Sakai, Takenobu

“…This paper presents a quantitative method for predicting the experimental value of the tensile strength of a polymer material by using molecular dynamics (MD)…”
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