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Article

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

1
Department of Construction and Manufacturing Engineering, University of Oviedo, 33203 Gijón, Spain
2
Department of Materials Science and Metallurgical Engineering, University of Oviedo, 33203 Gijón, Spain
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(11), 1788; https://doi.org/10.3390/polym11111788
Received: 10 October 2019 / Revised: 25 October 2019 / Accepted: 25 October 2019 / Published: 1 November 2019
Composite materials manufactured by overlapping plies with certain specific geometries are likely to lose part of their strength due to the presence of internally delaminated regions. The aim of this paper is to experimentally evaluate the generation and propagation of these interlaminar cracks in a carbon-epoxy composite material subjected to fatigue loading under mixed mode I/II fracture. Two different test methods were used for this purpose: The standardized mixed-mode bending (MMB) test and the asymmetric double cantilever beam (ADCB) test, with the goal of exploring the viability of the ADCB test as a simpler alternative to perform than the MMB test, especially in fatigue testing. With this aim in mind and after prior static characterization of the material in which the critical values of the energy release rate were determined under both test methods, the levels of the energy release rate to be applied in fatigue tests were defined for two mode mixity ratios, GII/Gc = 0.2 and 0.4 (0.34 ADCB), and a fatigue loading ratio, R = Gmin/Gmax = 0.1. The G-N fatigue onset curves were subsequently obtained from these experimental data. The most relevant result of the study is that the fatigue limits obtained using the MMB method are generally more conservative than those obtained via the ADCB method. View Full-Text
Keywords: composite; fracture; fatigue; mixed mode I/II composite; fracture; fatigue; mixed mode I/II
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MDPI and ACS Style

Argüelles, A.; Rocandio, C.; Rubiera, S.; Viña, I.; Viña, J. Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture. Polymers 2019, 11, 1788. https://doi.org/10.3390/polym11111788

AMA Style

Argüelles A, Rocandio C, Rubiera S, Viña I, Viña J. Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture. Polymers. 2019; 11(11):1788. https://doi.org/10.3390/polym11111788

Chicago/Turabian Style

Argüelles, Antonio, Clara Rocandio, Silvia Rubiera, Isabel Viña, and Jaime Viña. 2019. "Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture" Polymers 11, no. 11: 1788. https://doi.org/10.3390/polym11111788

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