Explaining the multiple energy thresholds for damage mechanisms activation in laminate composites under cyclic loadings

Roberto Ferreira Motta, René Alderliesten, Dimitrios Zarouchas, Marcos Yutaka Shiino, Maria Odila Hilario Cioffi, Herman Jacobus Cornelis Voorwald

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
27 Downloads (Pure)

Abstract

After half a century of developing fatigue delamination prediction models, where accuracy seems more important than physical understanding, this research aims to merge both aspects. To that aim, strain energy release (SER) within the fatigue load cycle was studied using acoustic emission. The correlation between the measured strain energy release and the acoustic emission energy was formulated through a conversion factor to convert one into the other. The strain energy release distribution within the loading cycle indicated that different damage mechanisms are activated in different increments of the load cycle associated with different energy thresholds. The presence of multiple energy thresholds indicated that the application of different loading cycles results in distinct resistances to damage propagation (dU/dA) depending on which energy threshold is crossed.

Original languageEnglish
Article number107451
Number of pages18
JournalComposites Part A: Applied Science and Manufacturing
Volume167
DOIs
Publication statusPublished - 2023

Funding

The authors acknowledge the financial support by FAPESP, through process numbers 2019/00846-3, and 2019/18570-4, and by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. Additionally, the authors specially thank Dr. Milad Saeedifar (Aerospace structures and Materials Department, Faculty of Aerospace Engineering, Delft University of Technology) for the help with the acoustic emission system.

Keywords

  • Fractography
  • Fracture mechanics
  • Laminates
  • Stress ratio

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