Kondou Ryouji

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

80404549
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Current Affiliation Organization 【 display / non-display 】

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Mechanical Systems Engineering   Associate Professor  

  • Duty   University of the Ryukyus   Faculty of Engineering   School of Engineering_Energy and Environment Program   Associate Professor  

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Academic degree 【 display / non-display 】

  • Okayama University -  Doctor of Engineering

  • University of the Ryukyus -  Master (Engineering)

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External Career 【 display / non-display 】

  • 2007.08
    -
    2017.03

    University of the Ryukyus, Faculty of Engineering, Department of Mechanical Systems Engineering, Mechanics and System Control, Associate Professor  

  • 2017.04
    　
    　

    University of the Ryukyus, Faculty of Engineering, Department of Engineering, Associate Professor  

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Research Interests 【 display / non-display 】

  • Plasticity,Deformation Processing

  • 計算力学

  • 材料力学

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Research Areas 【 display / non-display 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials

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Research Theme 【 display / non-display 】

  • Multi-Scale Analysis of Slip Deformation and Dislocation in Polycrystalline Material

  • Multi-Scale Analysis of Fatigue Phenomena and Dislocation in Polycrystalline Material

  • Multiphysics Analysis of Phase-Transformation and Elastic-plastic deformation in Polycrystalline Material

  • Optimal design of mechanical parts and 3D-CAD with Onshape

  • Development of Grain Refinement and Texture Control Technique of Polycrystalline Material

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Published Papers 【 display / non-display 】

  • Practice and effectiveness of basic drafting assignments using the "Extrude" feature of Onshape

    Ryouji KONDOU, Taishi KONDO, Shoto KAWASAKI, Shota NARISOKO, Akihiro FUJIKAWA, Masato GANEKO

    Journal of JSEE ( Japanese Society for Engineering Education )  72 ( 5 ) 105 - 110   2024.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    The authors attempted to create a manual on mechanical design drafting and 3D-CAD operation using Onshape for elementary and junior high school students. The manual was reviewed through actual verification work carried out by junior high school students and university students in the author's laboratory. By utilizing Onshape's extrusion function, basic drafting tasks in the field of mechanical design and drafting, such as cylinders, V-shaped blocks, and connecting rods, were constructed. These drawings of cylinders, V-shaped blocks, and connecting rods were combined with Onshape account registration, setup, printing 2D-CAD drawings from 3D-CAD drawings, and assembly drawings to complete a total of seven lectures. This corresponds to a quarter system (a 4-term system). The results of the study confirmed that even junior high school students who cannot read three-view diagrams can learn how to operate Onshape if an operation manual is prepared for them. Furthermore, the effectiveness of the system was verified by employing the operation manuals and basic drafting assignments created in the engineering design exercises.

  • Examination of Distance Learning Assignments in Mechanical Design Drafting and 3D-CAD by using Onshape

    KONDOU Ryouji, MATSUI Youki, TOKESHI Kai, GANEKO Masato, MIYAGI Noriyoshi

    Journal of JSEE ( Japanese Society for Engineering Education )  71 ( 2 ) 2_130 - 2_134   2023 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    The selection criteria and the selection results of a distance learning assignments on “mechanical design and drafting" considering the “Corona disaster" and assignments by using Onshape, such as the Shako vise and manual winch are studied, were examined through the actual confirmation work by the students in the author' s laboratory. It was found that Onshape was effective for distance lectures on mechanical design and drafting, and for providing an environment for conducting collaborative assignments. However, it also became clear that there are technical issues to consider when using Onshape to perform the drafting of a classic manual winch. The actual lecture management was conducted in collaboration with the university's technical staff. The effectiveness of the collaborative lecture by the teaching staff and technical staff is described.

  • VS06 Mechanical design drafting and 3D-CAD for elementary and middle school students by Onshape

    KONDOU Ryouji, KONDO Taishi, KAWASAKI Shoto, NARISOKO Shota, FUJIKAWA Akihiro

    Proceedings of Annual Conference of Japanese Society for Engineering Education ( Japanese Society for Engineering Education )  2023 ( 0 ) 276 - 277   2023 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Practice and effectiveness of classical basic drafting using "Extrude" function of Onshape

    KONDOU Ryouji, KONDO Taishi, KAWASAKI Shoto, NARISOKO Shota, FUJIKAWA Akihiro

    The Proceedings of Design & Systems Conference ( The Japan Society of Mechanical Engineers )  2023.33 ( 0 ) 1304   2023

    Type of publication: Research paper (scientific journal)

    　View Summary

    <p>The authors attempted to create a manual on mechanical design drafting and 3D-CAD operation using Onshape for elementary and junior high school students. The manual was reviewed through the actual verification work of junior high school students and university students in the author's laboratory. Using the extrusion feature of Onshape, we constructed classical foundation drafting such as cylinders, V-shaped blocks, connecting rods, and spanners. These drawings of cylinders, V-shaped blocks, and connecting rods were combined with Onshape account registration, setup, printing 2D-CAD drawings from 3D-CAD drawings, and assembly drawings to complete a total of seven lectures. From the results of the study, it was confirmed that even junior high school students who cannot read three-view-drawing can learn how to operate Onshape. In addition, the effectiveness of Onshape was further verified for students in the author's laboratory by actually employing Onshape in an engineering design exercise.</p>

  • Effect of Overload and Underload on Subsequent Deformation Behavior during Cyclic Deformation

    KONDOU Ryouji, YAMA Katsunari

    Journal of the Society of Materials Science, Japan ( The Society of Materials Science, Japan )  71 ( 2 ) 159 - 166   2022.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    <p>A multi-scale analysis of elasto-plastic deformation and dislocation movement and accumulation of tri-crystalline models during cyclic deformation was performed. The accumulation of dislocations in geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) was investigated in detail. Experimental observations have shown that fatigue life and fatigue crack propagation are also deteriorated when the material is subjected to overload or underload. However, in the microscopic and mesoscopic regions, where the effects of the crack tip shape change are not related to the size of the crack tip, a different phenomenon is essentially occurring. In this paper, the effects of overload and underload are investigated using a simple model without a crack. From the analysis results, it was found that the dislocation structure generated in the material subjected to overload or underload affects the subsequent deformation behavior. However, even though the absolute values are the same, the effects of overloading and underloading on the subsequent deformation are different, and underloading increases the non-uniformity of the subsequent deformation, which is on the dangerous side, while overloading decreases with increasing the number of repetitions. </p>

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Presentations 【 display / non-display 】

  • Proposal to Improve Exercises to Increase Achievement of Learning and Educational Goals for 3D-CAD with Onshape

    Ryouji KONDOU, Taishi KONDO, Asahi TSUNODA, Akira FUJII, Masaya Nagamura, Masato GANEKO

    2024.09  -  2024.09 

  • 3B13 Proposal to Improve Exercises to Increase Achievement of Learning and Educational Goals for 3D-CAD with Onshape

    KONDOU Ryouji, KONDO Taishi, TSUNODA Asahi, FUJII Akira, NAGAMURA Masaya, GANEKO Masato

    Proceedings of Annual Conference of Japanese Society for Engineering Education  2024  -  2024 

    CiNii Research

  • Mechanical design drafting and 3D-CAD for elementary and middle school students

    2023.09  -  2023.09 

  • Management Methods for Distance Learning of Mechanical Design and Drafting in the New Normal

    KONDOU Ryouji, GANEKO Masato, MIYAGI Noriyoshi

    The Proceedings of the Tecnology and Society Conference  2022  -  2022 

    CiNii Research

  • 2D14 Results of Project Management in Distance-Learning Caused by the Corona Disaster

    KONDOU Ryouji, MIYAMOTO Shun

    Proceedings of Annual Conference of Japanese Society for Engineering Education  2021.09  -  2021.09 

    CiNii Research

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SDGs 【 display / non-display 】

  • 金属多重結晶のすべり変形と転位の運動・蓄積のマルチスケール解析
    金属多重結晶の繰り返し変形に伴う疲労現象と転位の運動・蓄積のマルチスケール解析
    金属多重結晶の相変態と弾塑性変形のマルチフィジックス解析
    Onshapeによる機械部品の最適設計と3D-CAD
    金属多重結晶の集合組織制御と結晶粒微細化を伴う塑性加工技術の開発

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