RESEARCH ARTICLE


Modeling the Strength Degradation and Fatigue of Carbon Fiber Rein-forced Composites



Pasquale Verde*
Second University of Naples –SUN Department of Aerospace and Mechanical Engineering Via Roma 19 Aversa (CE) 81031, Italy.


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© 2012 Pasquale Verde;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Second University of Naples –SUN Department of Aerospace and Mechanical Engineering Via Roma 19 Aversa (CE) 81031, Italy; Tel: 390815010291; Fax: +390815010291; E-mail: pasquale.verde@unina2.it


Abstract

Static and fatigue data available in literature concerning carbon fiber reinforced composite laminates subjected tension-tension fatigue were re-elaborated in the framework of a two-parameter fatigue model explicitly accounting for the cyclic as well as the mean stress. The data were used to obtain the model parameters by best fitting procedures. A primitive statistical implementation of the model was based on the hypothesis that the monotonic tensile strength follows a two-parameter Weibull distribution. The model has the potential of being predictive indicating that the fatigue character-ization of given laminate can be achieved with a minimum of experimental tests. The model reliability and its applicabil-ity limits are discussed.

Keywords: Fatigue, carbon fibers, composites, residual strength, Weibull distribution.