Delamination toughening of composite laminates using weakening or toughening interlaminar patches to initiate multiple delaminations: A numerical study

Guillem Gall Trabal, Brian Lau Verndal Bak, Boyang Chen, Simon Mosbjerg Jensen, Esben Lindgaard*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)
6 Downloads (Pure)

Abstract

A numerical study on toughening laminated composite materials against delamination by initiating multiple interlaminar cracks is presented. Different configurations of interface toughening and weakening patches, that modify the interface properties at selected locations, are investigated as a way to trigger multiple delaminations. Both interface toughening and weakening patches can be configured to toughen the laminated material by initiating multiple delaminations. The initiation of multiple delaminations and the increase in toughness depend on the interface strengths and toughness of the patches. The main mechanisms behind the initiation of multiple delaminations for both cases are presented. An adaptive refinement method implemented within a Matlab Finite Element Analysis code that models the interfaces of the laminate with cohesive elements is used for the analyses. The adaptive refinement framework allows efficient analysis of multiple delaminations with very fine meshes at the wake of the crack tips. A discussion on the overall performance of the toughening concept, and the main parameters affecting the results, i.e. the length of the interface toughening or weakening patches, the distance of the substrate between the affected interfaces, and the material's mechanical properties, is carried out. The results presented in the paper show that a toughening effect against delamination can be achieved using interface toughening or weakening patches to onset multiple delaminations.

Original languageEnglish
Article number108730
JournalEngineering Fracture Mechanics
Volume273
ISSN0013-7944
DOIs
Publication statusPublished - 1 Oct 2022

Bibliographical note

Funding Information:
This work is supported by the Talent Management Programme at Aalborg University, Denmark (Internal grant number: 771120) . This support is gratefully acknowledged.

Publisher Copyright:
© 2022 The Author(s)

Keywords

  • Adaptive refinement
  • Cohesive Zone Modelling
  • Delamination toughening
  • Floating Node Method
  • Multiple delaminations

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