University of the Ryukyus · Faculty of Engineering · 教授

Research keywords計算力学・材料加工学・電気電子・機械・材料工学

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• Fabrication of a functional composite material using waste concrete powder and polyethylene2026 · Yasuyuki KANDA, Tsuguri KUSUMOTO
• 回転とひずみ自由度を有する三節点三角形軸対称要素の開発と微圧縮材料に対する性能調査2026 · 木村皓詞、神田康行
• 回転とひずみ自由度を有する四節点四面体要素の微圧縮材料に対する性能調査2025 · In this study, we investigate the accuracy of four-node tetrahedral elements with drilling and strain degrees of freedom (GNTet4) for nearly incompressible materials. GNTet4 is a one of the generalized finite element method approximation. Three types of GNTet4 are introduced by applying approximation polynomials of the Taylor expansion. First, we reveal the extra degrees of freedom constraints without the zero-energy modes of each GNTet4 through eigenvalue analysis. Next, the displacement accuracy of each GNTet4 is evaluated by analyzing a cantilever beam. The results shows that GNTet4, which approximates the third-order Taylor expansion (GNTet4-3rd), is almost identical to a 20-node tetrahedral element. Furthermore, a plane-strain compression test is performed to investigate the analytical accuracy of each GNTet4 for nearly incompressible materials. To analyze nearly incompressible materials with high accuracy, selective reduced integration (SRI) and third-order Taylor expansion must be applied to GNTet4 (GNTet4-3rd with SRI). Incidentally, the analysis accuracy of GNTet4-3rd with SRI is the same as or higher than that of the 10-node tetrahedral element (FEM-Tet10). Furthermore, the GNT4-3rd with SRI, which possess the nodal point at the element vertex only, suppressed the nodal oscillation. Thus, in nearly incompressible materials, to obtain the same analysis accuracy as that of FEM-Tet10, the four-node tetrahedral element must apply the displacement function of the fourth order and the SRI.
• Spark plasma sintering using siliceous waste concrete powder2025 · Yasuyuki KANDA

• 埋立地盤における自己組織化と環境調和を追求した革新的な修復技術の創出2024 · 挑戦的研究(開拓)
• 放電プラズマ焼結法による再生骨材をリサイクルしたセラミックスの開発2019 · 基盤研究(C)
• 有限要素法を用いた粒子分散型複合材料のころがり疲労特性の解明2010 · 若手研究(B)
• さとうきびバガスと廃コンクリートを活用したプラスチック複合材料の成形加工

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