An improved delamination fatigue cohesive interface model for complex three-dimensional multi-interface cases

Chongcong Tao, Supratik Mukhopadhyay, Bing Zhang, Luiz Kawashita, Jinhao Qiu, Stephen Hallett*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)
234 Downloads (Pure)

Abstract

This work presents a cohesive interface model for predicting interlaminar failure of composite laminates under tension-tension fatigue loading. The model features improvements on previous formulations and utilizes four-integration-point elements, which offer several new advantages, while maintaining the merits of the previous single-integration-point elements. An element-based crack tip tracking algorithm is incorporated to confine fatigue damage to crack-tip elements only. A new local rate approach is proposed to ensure accurate integration of strain energy release rate from local elements. Furthermore, a dynamic fatigue characteristic length is proposed to offer a more accurate estimation of fatigue characteristic length in complex threedimensional cases. Fatigue initiation is incorporated by using a strength reduction method, without changing the propagation characteristics. The numerical approach has been verified and validated using multiple cases and was then applied to fatigue damage development in open-hole laminates, where a good agreement between numerical analysis and experimental results was obtained.
Original languageEnglish
Pages (from-to)633-646
Number of pages14
JournalComposites Part A: Applied Science and Manufacturing
Volume107
Early online date7 Feb 2018
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • Laminates
  • Fatigue
  • Cohesive interface modelling
  • Finite element analysis (FEA)

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