Applicability of Fracture Mechanics in Strength Evaluation of Functionally Graded Materials

• TOHGO Keiichiro

  Department of Mechanical Engineering, Shizuoka University

• SAKAGUCHI Manabu

  Department of Mechanical Engineering, Shizuoka University

• ISHII Hitoshi

  Department of Mechanical Engineering, Shizuoka University

抄録

Elastic and elastic-plastic analyses of a crack in a particulate-dispersed functionally graded material (FGM) have been carried out using a newly developed finite element method based on Tohgo-Chou-Weng's (1994, 1996) constitutive relation for particulate-reinforced composites. By setting the mechanical properties of particles and a matrix and their content graded in the thickness direction, FGMs and non-FGM are designed. From comparison of the numerical results for the FGMs and non-FGM, the influence of the gradient of the mechanical properties on a stress intensity factor and the crack tip field is discussed. The following conclusions are derived: (1) The stress intensity factor of a crack under constant boundary conditions is considerably affected by the gradient of the mechanical properties. (2) The elastic and plastic stress singular fields around a crack tip in a FGM are basically described by the fracture mechanics parameters (K_I and J_I) as well as in a non-FGM, using the mechanical properties of the material at the crack tip. (3) The size of the singular field decreases with an increase in the gradient of the mechanical properties. This means that the applicability of fracture mechanics, such as the small-scale-yielding condition and the validity of the J-integral, is affected by the gradient.

収録刊行物

• JSME international journal. Ser. A, Mechanics and material engineering

  JSME international journal. Ser. A, Mechanics and material engineering 39 (4), 479-488, 1995-10-01

  一般社団法人日本機械学会

キーワード

• Functionally Graded Material
• Fracture Mechanics
• Finite Element Method
• Particulate-Reinforced Composite
• Stress Intensity Factor
• Crack-Tip Field

詳細情報

• CRID: 1571417127134648576
• NII論文ID: 110002964488
• NII書誌ID: AA10888746
• ISSN: 09148809
• 本文言語コード: en
• データソース種別:
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