Analysis of Crack-Tip Field of Particulate-Reinforced Composites Taking Account of Particle Size Effect and Debonding Damage

Abstract:

This paper deals with an analysis of a crack-tip field of particulate-reinforced composites which can describe the evolution of debonding damage, matrix plasticity and particle size effect on deformation and damage. Numerical analyses were carried out on a crack-tip field in elastic-plastic matrix composites reinforced with elastic particles by using a finite element method developed based on an incremental damage theory. The particle size effect on damage is described by a critical energy criterion for particle-matrix interfacial debonding. The effect of debonding damage on a crack-tip field is discussed based on numerical results. The debonding damage initiates and progresses ahead of a crack-tip. The stress distribution shifts downward in the debonding damage area. It is concluded that a crack-tip field is strongly affected by debonding damage.

• Periodical: Key Engineering Materials (Volumes 452-453)
• Pages: 625-628
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.452-453.625
• Online since: November 2010
• Authors: Tomoyuki Fujii, Keiichiro Tohgo, Yu Itoh, Daisuke Kato, Yoshinobu Shimamura
• Keywords: Crack-Tip Field, Debonding Damage, Finite Element Analysis (FEA), Incremental Damage Theory, Micro-Mechanics, Particulate-Reinforced Composites, Size Effect

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[4] 9 10 ( m) J J= × 50µm50µm Fig. 4. Damage zone and equivalent stress around a crack-tip (J=4. 9x102J/m 2). Fig. 3. Distributions of stress and void volume fraction ahead of a crack-tip. (a) Damage zone, fd (b) Equivalent stress, σe/σ0.