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

doi:10.1016/j.compositesa.2023.107451

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

Structural Integrity & Composites

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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 language	English
Article number	107451
Number of pages	18
Journal	Composites Part A: Applied Science and Manufacturing
Volume	167
DOIs	https://doi.org/10.1016/j.compositesa.2023.107451
Publication status	Published - 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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Ferreira Motta, R., Alderliesten, R., Zarouchas, D., Yutaka Shiino, M., Odila Hilario Cioffi, M., & Jacobus Cornelis Voorwald, H. (2023). Explaining the multiple energy thresholds for damage mechanisms activation in laminate composites under cyclic loadings. Composites Part A: Applied Science and Manufacturing, 167, Article 107451. https://doi.org/10.1016/j.compositesa.2023.107451

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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.",

keywords = "Fractography, Fracture mechanics, Laminates, Stress ratio",

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Ferreira Motta, R, Alderliesten, R , Zarouchas, D, Yutaka Shiino, M, Odila Hilario Cioffi, M & Jacobus Cornelis Voorwald, H 2023, 'Explaining the multiple energy thresholds for damage mechanisms activation in laminate composites under cyclic loadings', Composites Part A: Applied Science and Manufacturing, vol. 167, 107451. https://doi.org/10.1016/j.compositesa.2023.107451

TY - JOUR

T1 - Explaining the multiple energy thresholds for damage mechanisms activation in laminate composites under cyclic loadings

AU - Ferreira Motta, Roberto

AU - Alderliesten, René

AU - Zarouchas, Dimitrios

AU - Yutaka Shiino, Marcos

AU - Odila Hilario Cioffi, Maria

AU - Jacobus Cornelis Voorwald, Herman

PY - 2023

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N2 - 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.

AB - 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.

KW - Fractography

KW - Fracture mechanics

KW - Laminates

KW - Stress ratio

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ER -

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

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