High-fidelity fe modelling of Z-pins in quasi-isotropic laminates

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)

Abstract

This paper presents a three-dimensional FE modelling approach to simulate the mechanical response of individual Z-pins at the micro-scale and the associated bridging mechanism. This modelling strategy accounts for the characteristic features associated with Z-pinning, i.e. the interface between Z-pin and the surrounding laminate block, residual stresses due to the postcure cool down and split within the Z-pin. The Z-pin failure is described using the Weibull's failure criterion. The analysis results are in excellent agreement with the experimental results from tests performed on single Z-pinned quasi-isotropic coupons. The analyses demonstrate that the de-bonding of the Z-pins from the laminate is essentially due to thermal residual stresses. For both Mode I and Mode II loading cases, enhanced friction zones develop along the Z-pin. This is the main cause of the progressive split between fibre strands in Mode II. The split initiates at the Z-pin centre and then propagates along the neutral plane. The modelling strategy presented in this paper can be directly extended to arbitrary stacking sequences as well as asymmetric insertion cases.

Original languageEnglish
Title of host publication16th European Conference on Composite Materials, ECCM 2014
Subtitle of host publicationSeville, Spain
PublisherEuropean Conference on Composite Materials, ECCM
ISBN (Print)9780000000002
Publication statusPublished - 1 Jan 2014
Event16th European Conference on Composite Materials, ECCM 2014 - Seville, Spain
Duration: 22 Jun 201426 Jun 2014

Conference

Conference16th European Conference on Composite Materials, ECCM 2014
CountrySpain
CitySeville
Period22/06/1426/06/14

Structured keywords

  • Composites UTC

Keywords

  • Delamination
  • Finite element analysis (FEA)
  • Fracture
  • Z-pinning

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