@techreport{oai:kindai.repo.nii.ac.jp:00022109,
 author = {沖中, 知雄 and Maddegedar, Lalith},
 month = {},
 note = {https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K06545/, 研究成果の概要（和文）：き裂分岐のメカニズムを実験と数値解析を用いて検討することを目的として研究を行った．実験では高時間分解能・高空間解像度な画像計測を用いてき裂の分岐挙動の画像計測を行った．進展するき裂は試験後の供試体で確認できる分岐点より前に複数の非貫通き裂に分岐し，発生したき裂は互いに平行に進展しながら再分岐と合流を繰り返した後に互いに遠ざかる方向に進展方向を変え，分岐き裂に成長する挙動が明らかになった．またき裂分岐直前のき裂進展速度の変動は確認された部分き裂の分岐と合流に起因することが明らかになった．数値解析では，高次PDS-FEM法を動的問題に拡張し，き裂の進展を再現することができた．研究成果の概要（英文）：The mechanism of crack branching is studied experimentally and numerically in this work. The image measurement with high temporal and high spatial resolutions is applied to the crack branching behavior. It is observed that the singe propagation crack bifurcates into multiple partial cracks and they repeats re-branching and merging while propagating parallel to each other, before the bifurcation point which is confirmed in the specimen after the experiment. They change the propagating directions to those of moving away from each other, and grow into the branching cracks. It's also concluded that the fluctuation of the crack propagation speed before the bifurcation is caused due to the re-branching and merging behavior of partial cracks.As the numerical simulation, high-order PDS-FEM is applied to the dynamic simulation and the crack propagation is successfully simulated., 研究種目：基盤研究(C);  研究期間：2017～2020;   課題番号：17K06545;   研究分野：材料力学;   科研費の分科・細目：, application/pdf},
 title = {高時間分解能画像計測と高次PDS-FEMを用いたき裂分岐についての検討},
 year = {2021},
 yomi = {オキナカ, トモオ}
}