622 分子動力学による異材接合界面の破壊描像とSPH法での数値的破壊との関連(S02 粒子法による先端シミュレーション)

概要

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Fracture mechanism of interface in metal-ceramics (silicon carbide: SiC) composite material is investigated by molecular dynamics (MD) and smoothed particle hydrodynamics (SPH) methods. In SPH elastic-plastic analysis, a specimen with U-shape notches is subjected to tensile loading and exhibits the fracture in metal region. Distance from interface plane to actual fracture surface depends largely on the ratio of yield strength to Young's modulus of metal. Nano-scale MD computation model of SiC-Al welded on (001) planes is subjected to tensile loading as well. Obvious deformation does not observed in SiC region at all and plastic deformation in aluminum region leads to breakage of the specimen. Though the fracture in SPH is supposed to be caused not only by stress concentration but also by numerical tensile instability, we can find that our MD results support adequacy of physical view about the interface fracture obtained by SPH.
一般社団法人日本機械学会の論文
2005-09-18