Micromechanical model for off-axis creep rupture in unidirectional composites undergoing finite strains

Dragan Kovačević*, Bharath K. Sundararajan, Frans P. van der Meer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

A microscale numerical framework for modeling creep rupture in unidirectional composites under off-axis loading is presented, building on recent work on imposing off-axis loading on a representative volume element. Creep deformation of the thermoplastic polymer matrix is accounted for by means of the Eindhoven Glassy Polymer material model. Creep rupture is represented with cohesive cracks, combining an energy-based initiation criterion with a time-dependent cohesive law and a global failure criterion based on the minimum in homogenized creep strain-rate. The model is compared against experiments on carbon/PEEK composite material tested at different off-axis angles, stress levels and temperatures. Creep deformation is accurately reproduced by the model, except for small off-axis angles, where the observed difference is ascribed to macroscopic variations in the experiment. Trends in rupture time are also reproduced although quantitative rupture time predictions are not for all test cases accurate.

Original languageEnglish
Article number107860
JournalComposites Part A: Applied Science and Manufacturing
Volume176
DOIs
Publication statusPublished - Jan 2024

Keywords

  • Cohesive zone modeling
  • Energy-based initiation
  • Homogenization
  • Thermoplastic composites
  • UT-Hybrid-D

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