Bibliographic citations
Candiotti, S., (2019). Caracterización y modelamiento de la fibra de ichu para su uso como refuerzo en materiales compuestos laminados [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/20059
Candiotti, S., Caracterización y modelamiento de la fibra de ichu para su uso como refuerzo en materiales compuestos laminados [Tesis]. PE: Universidad Nacional de Ingeniería; 2019. http://hdl.handle.net/20.500.14076/20059
@misc{renati/710878,
title = "Caracterización y modelamiento de la fibra de ichu para su uso como refuerzo en materiales compuestos laminados",
author = "Candiotti Barrenechea, Sergio Alonso",
publisher = "Universidad Nacional de Ingeniería",
year = "2019"
}
In this thesis, the characterization of mechanical properties like strength, elastic modulus and strain to failure of the fibers extracted from the Stipa Obtusa plant (ichu) was performed according to the ASTM C1557 and ASTM D3033 standards, in order to evaluate their potential as reinforcement in polymer matrix composites. The mechanical properties of the fiber were optimized using a thermochemical treatment with 0.5 M NaOH, with a treatment time of 1.5, 3.5 and 5 hours at a constant temperature of 70 °C. Fiber-matrix compatibility of the treated fibers and unsaturated polyester matrix was studied via the single fiber fragmentation test, following the guidelines of the Technical University of Denmark. From compatibility and mechanical properties results, the best treatment time was set to to 3.5 hours. Afterwards, these fibers were used to evaluate their properties at different fiber lengths, strain rates and cyclic deformation; showing a decrement in strength and strain with an increase in fiber length, a reduction of strength and elastic modulus when the strain rate is around 0.2 mm/min, and an increment in the elastic modulus when subjected to a cyclic strain. For the evaluated cases, results shows that the Ichu fiber strength is in the range of 362 to 514 MPa, the elastic modulus from 21.8 to 28.6 GPa, and the failure strain is in the range between 1.7 to 2.3%. Finally, to determine the remaining mechanical properties of the fiber, an analytical modelling based on the concentric cylinder method was used, obtaining the mechanical properties of the fiber that cannot be obtained by experimental characterization. Results shows that the Ichu fiber has potential to be used as a reinforcement in polymer matrix composites.
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