Modelling the competition between interface debonding and particle fracture using a plastic strain dependent cohesive zone
✍ Scribed by Y. Charles; R. Estevez; Y. Bréchet; E. Maire
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 805 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
In metal matrix composites made of elastic spherical reinforcements (zirconia and/or silica ceramics) embedded in an aluminium matrix two damage mechanisms are observed to trigger failure: particle fracture or decohesion at the particle-matrix interface. Experimentally, it was shown that the dominant damage mechanism is governed by the matrix plastic characteristics: a soft matrix composite shows interface debonding while particles breakdown occurs in the composite with a hard matrix. The physics underlying this dependence are related to plastic strain near the interface which can assist decohesion. We present a cohesive zone model for the particle-matrix interface that accounts for local plastic strain effects, based on the analysis of the influence of dislocation accumulation on the local stress level. Such a description is shown able to capture the experimental observations while being simple to implement in a finite element code, as performed here with Abaqus.