Rate-dependent modelling of the meso-mechanics of z-pins bridging mixed mode delaminations

Hussein Hijazi, Hao Cui, Giuliano Allegri, Stephen R. Hallett, Nik Petrinic

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

Abstract

In this paper, a rate dependent model is developed to simulate the bridging performance of z-pins subject to Mode I and Mode II loading. Z-pins are modelled as beams embedded in a Winkler elastic foundation with friction. The latter is described via Ruina's state dependent friction model in order to incorporate the rate effect. The Ruina's model parameters were calibrated against a Mode I and Mode II test carried out at a pullout speed of 5m/s and 1m/s respectively. The calibrated model was then validated against a mode I and mode II test conducted at 12m/s and 1.5m/s respectively. The predicted force versus opening-displacement trend is in excellent agreement with the experimental one. The error of predicted apparent fracture toughness is within 5% of the experimental value.

Original languageEnglish
Title of host publicationECCM 2018 - 18th European Conference on Composite Materials
Publisher Applied Mechanics Laboratory
ISBN (Electronic)9781510896932
Publication statusPublished - 1 Jan 2020
Event18th European Conference on Composite Materials, ECCM 2018 - Athens, Greece
Duration: 24 Jun 201828 Jun 2018

Publication series

NameECCM 2018 - 18th European Conference on Composite Materials

Conference

Conference18th European Conference on Composite Materials, ECCM 2018
CountryGreece
CityAthens
Period24/06/1828/06/18

Keywords

  • Delamination
  • Rate-effect
  • Z-pinning

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    Hijazi, H., Cui, H., Allegri, G., Hallett, S. R., & Petrinic, N. (2020). Rate-dependent modelling of the meso-mechanics of z-pins bridging mixed mode delaminations. In ECCM 2018 - 18th European Conference on Composite Materials (ECCM 2018 - 18th European Conference on Composite Materials). Applied Mechanics Laboratory.