Researchers

Education and Career

Academic & Professional Experience

• 2011 - 2014 , Kindai University Faculty of Science and Engineering 准教授

Research Activities

Research Areas

• Social infrastructure (civil Engineering, architecture, disaster prevention), Structural and seismic engineering
• Social infrastructure (civil Engineering, architecture, disaster prevention), Civil engineering (materials, implementation, construction management)
• Social infrastructure (civil Engineering, architecture, disaster prevention), Hydroengineering

Research Interests

PIV, X-FEM, 亀裂進展, き裂不安定成長, 超高速ビデオカメラ, 画像計測, 動的J積分, 亀裂進展過程, 光弾性実験, 応力波, 画像解析, 歪速度依存性, 動的光弾性実験, ISISカメラ, 圧縮き裂, 超高速撮影, 衝撃問題, ガウス粒子, 亀裂進展速度, 阪神・淡路大震災

Published Papers

1. Recent developments in MHz radioscopy: Towards the ultimate temporal resolution using storage ring-based light sources
   A. Rack; H. Sekiguchi; K. Uesugi; N. Yasuda; Y. Takano; T. Okinaka; A. Iguchi; L. Milliere; B. Lukić; M.P. Olbinado; T.G. Etoh
   Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment  Jan. 2024 
2. 高時間分解能画像計測を用いた分岐き裂挙動の検討
   沖中知雄
   実験力学  20  (3)  , 194-200, Sep. 2020  , Refereed
3. Application of PDS-FEM to the Simulation of Dynamic Crack Propagation and Supershear Rupture
   L.Quaranta; L.Maddegedara; T.Okinaka; M.Hori
   Computational Mechanics  65  , 1289-1304, Jan. 2020  , Refereed

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MISC

1. Visualization of stress field around the propagating crack tip under the static loading with an ultra-high-speed camera , OKINAKA T. , Journal of Applied Mechanics, JSCE , 10 , 301 , 309 , 2007
   Summary:The stress field around the propagating crack tip under the static loading is visualized. An ultra high speed camera of 1Mfps (Million frames per second) is applied to visualize the stress field around the crack tip by means of conventional photo-elastic imaging technique. A new video trigger system is also developed to detect the initiation of the crack propagation. As a result, it is revealed that the elastic wave, propagating in the specimen, has a significant effect on the crack propagation behavior.
2. Visualization of stress field around the propagating crack tip under the static loading with an ultra-high-speed camera , OKINAKA T , Journal of Applied Mechanics, JSCE , 10 , 301 , 309 , 2007
3. :Application to the Crack Propagation Problem , OKINAKA Tomoo; ETOH T.Goji , Doboku Gakkai Ronbunshuu A , 6 , 445 , 454 , 2003
   Summary:The object of this research is to develop an accurate particle detection method for image analysis. Image analysis with in-situ storage image sensor (ISIS) camera is expected to be a powerful tool for finite deformation problem of continuum medium under high-strain rate. Accurate particle detection is of importance in this application, since the accuracy of detected strain strongly depends on that of particle detection. Tracking of Gaussian particle is combined with the size and configuration of photo diodes on ISIS. Then, the problem of particle detection is successfully reduced to the optimization problem with three variables. The proposed method results in the accuracy of 0.011 pixel according to the numerical simulation.<BR>Finally, the image analysis with proposed method is applied to the crack propagation problem under the impact loading. Strain concentration preceding the crack propagation is obtained through the image analysis.

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Research Grants & Projects

1. 日本学術振興会, 科学研究費助成事業, 高時間分解能画像計測と高次PDS-FEMを用いたスーパーシア破壊についての検討 , 近畿大学
2. Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, A study on crack bifurcation mechanism by using image measurement with high temporal and spacial resolutions, and high-order PDS-FEM , Kindai University
3. Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Experimental and numerical study on the three dimensional wing crack under uniaxial compression , Kindai University

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