| Grant number: | 17/10606-4 |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| Start date: | March 01, 2020 |
| End date: | September 30, 2021 |
| Field of knowledge: | Engineering - Aerospace Engineering |
| Principal Investigator: | Maria Odila Hilário Cioffi |
| Grantee: | Francisco Maciel Monticeli |
| Host Institution: | Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil |
Abstract Hybrid composites application for aeronautics industry could be a feasible solution to carbon fiber high cost. However, mechanical properties of this new composite remain being fundamental for structural application. One of the main factors that restricts laminated composites use in the aeronautical industry is the low value of interlaminar fracture toughness, which is represented mainly by matrix/reinforcement adhesion.As result of a rapid crack propagation occurred in the interlaminar section. Considering carbon fibers surface treatments, which introduces an excessively strong adhesion and, as a consequence, a possible weakening of the composite, the toughness could be increased with the introduction of fiber glass. Thereby, it became necessary the knowledge of hybrid interface influence in crack propagation rate per numbers of cycles. The main objective of this work is to determine the influence that the interface of hybrid composite offers in crack propagation on individual opening modes I and II, through specimen delamination, which will be subjected to cyclic loading with constant amplitude. For this, mathematical contributions of both fibers in crack propagation will be analyzed and validated experimentally, through the model developed by Khan. Thus, establishing the parameters for fatigue characterization of each mode individually. Crack propagation prediction, considering the physical mechanisms of fracture, will be performed with theoretical analytical model application and made possible through experimental results. The fractographic investigation makes possible the analysis of failure mechanisms and the microstructural influence of hybrid interface in interlaminar fracture toughness, qualitatively and quantitatively. (AU) | |
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