Understanding the mechanical behavior of fiber/matrix interfaces during push-in tests by means of finite element simulations and a cohesive zone model

D. Esqué-De Los Ojos, R. Ghisleni, A. Battisti, G. Mohanty, J. Michler, J. Sort, A. J. Brunner

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Abstract

© 2016 Elsevier B.V. All rights reserved. The present work represents a progress towards the understanding of the mechanical behavior of the fiber/matrix interface during push-in tests of fiber-reinforced polymer-matrix composites. Finite element simulations incorporating a cohesive zone model are used for this purpose. Different values of interface strength, interface fracture toughness, fiber diameter and friction coefficient are considered to study how they affect the load-displacement curves. A critical value of the displacement exists, being independent of the fiber diameter for given values of interface strength and fracture toughness, marking the separation between two regimes: (i) a cohesive-dominated zone interaction and (ii) a frictional contact between debonded fiber and matrix. Maps showing the different regimes are constructed, proving their helpfulness to tune the mechanical properties of the interface in order to favor a certain mechanical response. Finally, we study the debonding velocity and how this is affected by the mechanical properties of the interface providing an empirical relation.
Original languageEnglish
Pages (from-to)330-337
JournalComputational Materials Science
Volume117
DOIs
Publication statusPublished - 1 May 2016

Keywords

  • Cohesive zone model
  • Fiber/matrix adhesion
  • Fiber/matrix interface
  • Finite element analysis (FEA)
  • Mechanical properties
  • Push-in test

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    Esqué-De Los Ojos, D., Ghisleni, R., Battisti, A., Mohanty, G., Michler, J., Sort, J., & Brunner, A. J. (2016). Understanding the mechanical behavior of fiber/matrix interfaces during push-in tests by means of finite element simulations and a cohesive zone model. Computational Materials Science, 117, 330-337. https://doi.org/10.1016/j.commatsci.2016.02.009