Abstract
This paper deals with the influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip in particulate-reinforced composites (PRCs). Finite element analysis has been carried out on a crack-tip field in PRCs with debonding damage and containing various sized particles. The finite element method is developed based on a micromechanics model of PRCs by Tohgo et al. (Compos Part A 41:313–321, 2010) which can describe the debonding damage of particles from matrix and the particle size effect on deformation and damage. The influence of particle size and debonding damage on an elastic–plastic singular field around a crack-tip is discussed based on the numerical results. The stress distribution ahead of a crack-tip in the composites shifts upward with decreasing particle size unless the debonding damage develops. In the composites with damage, the debonding damage occurs from a crack-tip and progresses ahead of a crack-tip. The stress distribution shifts downward in the damage zone. It is concluded that the crack-tip field is strongly affected by the particle size and debonding damage.
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