Monte Carlo Simulation of Tensile Fracture Behavior of Unidirectional Fiber Reinforced Brittle Matrix Composite with Weak Interface

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  • Ochiai Shojiro
    Mesoscopic Materials Research Center, Graduate School of Engineering, Kyoto University
  • Fujita Takayuki
    Mesoscopic Materials Research Center, Graduate School of Engineering, Kyoto University
  • Tanaka Mototsugu
    Mesoscopic Materials Research Center, Graduate School of Engineering, Kyoto University
  • Hojo Masaki
    Mesoscopic Materials Research Center, Graduate School of Engineering, Kyoto University
  • Tanaka Ryohei
    Japan Ultra-high Temperature Materials Research Institute, Yamaguchi Institute
  • Miyamura Ko
    Japan Ultra-high Temperature Materials Research Institute, Yamaguchi Institute
  • Nakayama Hirotoshi
    Japan Ultra-high Temperature Materials Research Institute, Gifu Institute
  • Yamamoto Masaaki
    Japan Ultra-high Temperature Materials Research Institute, Yamaguchi Institute
  • Fujikura Masakuni
    Japan Ultra-high Temperature Materials Research Institute, Gifu Institute

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Other Title
  • 界面が弱い一方向繊維強化脆性マトリックス複合材料の引張破壊挙動のモンテカルロシミュレーション
  • カイメン ガ ヨワイ 1ホウコウ センイ キョウカゼイセイ マトリックス フクゴウ ザイリョウ ノ ヒッパリ ハカイ キョドウ ノ モンテカルロシミュレーション

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Description

Simulation study of tensile fracture behavior of unidirectional elastic fiber/elastic matrix composite with weak interface was carried out by means of a Monte Carlo method combined with a modified shear lag analysis. With the present method, following features of weakly bonded composites could be expressed. (1) When the fracture strain of matrix is low, the residual stresses (tensile and compressive stresses along fiber axis for matrix and fiber, respectively) enhances fracture of matrix and interfacial debonding during cooling and/or at low applied strains. As a result, the strength of composite is practically given by the strength of the fiber bundle. (2) When the fracture strain of the matrix and frictional shear stress at the debonded interface increases and the residual stresses decrease, the strength of composite increases. (3) Longitudinal cracks arise at the notch tip and grows to the grip-ends. Therefore, the nocthed strength is given by the net stress criterion.

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