Development of a molecular dynamic based cohesive zone model for prediction of an equivalent material behavior for Al/Al2O3 composite

Sazgar, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2016.10.001
  3. Abstract:
  4. The interfacial behavior of composites is often simulated using a cohesive zone model (CZM). In this approach, a traction-separation (T-S) relation between the matrix and reinforcement particles, which is often obtained from experimental results, is employed. However, since the determination of this relation from experimental results is difficult, the molecular dynamics (MD) simulation may be used as a virtual environment to obtain this relation. In this study, MD simulations under the normal and shear loadings are used to obtain the interface behavior of Al/Al2O3 composite material and to derive the T-S relation. For better agreement with Al/Al2O3 interfacial behavior, the exponential form of the T-S relation suggested by Needleman [1] is modified to account for thermal effects. The MD results are employed to develop a parameterized cohesive zone model which is implemented in a finite element model of the matrix-particle interactions. Stress-strain curves obtained from simulations under different loading conditions and volume fractions show a close correlation with experimental results. Finally, by studying the effects of strain rate and volume fraction of particles in Al(6061-T6)/Al2O3 composite, an equivalent homogeneous model is introduced which can predict the overall behavior of the composite. © 2016
  5. Keywords:
  6. FEM ; Metal matrix composite ; Aluminum ; Interfaces (materials) ; Metallic matrix composites ; Molecular dynamics ; Strain rate ; Stress analysis ; Stress-strain curves ; Virtual reality ; Volume fraction ; Cohesive zone model ; Effects of strain rates ; Interfacial behaviors ; Matrix-particle interactions ; Matrix-particle interface ; MD simulation ; Molecular dynamics simulations ; Reinforcement particles ; Finite element method
  7. Source: Materials Science and Engineering A ; Volume 679 , 2017 , Pages 116-122 ; 09215093 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921509316312096