アルミナ粒子分散ガラス基複合材料におけるき裂の偏向, 湾曲による高靭化の数値シミュレーション

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タイトル別名
  • Numerical Simulation of Toughening by Crack Deflection and Bowing of Glass Matrix-Alumina Particulate Composite
  • アルミナ リュウシ ブンサン ガラスキ フクゴウ ザイリョウ ニ オケル キレ

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A numerical simulation of crack bowing and deflection was performed on glass matrix-alumina particulate composite to evaluate the effects on these toughening mechanisms of composite and was compared with the experimental data of previous works by the authors. The numerical simulation revealed that a crack deflection was predominant in the fracture process of glass matrix-alumina particulate composite and that the crack bowing hardly emerged. If it is assumed that the crack extended into an alumina particle, the crack bowing emerges. With an increase in the difference of the fracture toughness between the particles and the matrix, the toughening by crack bowing becomes more effective and is more effective than that by crack deflection. Under the assumption that the interfacial precipitation promotes the crack bowing, the results of the numerical simulation were in agreement with experimental data of the present authors.

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