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

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

Ferreira Motta, Roberto (São Paulo State University)
Alderliesten, R.C. (TU Delft Structural Integrity & Composites)
Zarouchas, D. (TU Delft Structural Integrity & Composites)
Yutaka Shiino, Marcos (São Paulo State University)
Odila Hilario Cioffi, Maria (São Paulo State University)
Jacobus Cornelis Voorwald, Herman (São Paulo State University)

2023

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.

Fractography
Fracture mechanics
Laminates
Stress ratio

http://resolver.tudelft.nl/uuid:b8a1935f-1884-42eb-8300-17906bf64d40

https://doi.org/10.1016/j.compositesa.2023.107451

2023-07-24

1359-835X

Composites Part A: Applied Science and Manufacturing, 167

Institutional Repository

journal article

© 2023 Roberto Ferreira Motta, R.C. Alderliesten, D. Zarouchas, Marcos Yutaka Shiino, Maria Odila Hilario Cioffi, Herman Jacobus Cornelis Voorwald