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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)633-646
Number of pages14
JournalComposites Part A: Applied Science and Manufacturing
Volume107
Early online date7 Feb 2018
DOIs
DateAccepted/In press - 6 Feb 2018
DateE-pub ahead of print - 7 Feb 2018
DatePublished (current) - 1 Apr 2018

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.

    Research areas

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

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S1359835X18300496 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

    Licence: CC BY-NC-ND

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