Título: Mechanical caracterization of non crimp fabric composites for aeronautical use

Autor: Illueca Puchol, Carlos

Resumen:

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[ES] El trabajo consiste en el estudio de un nuevo material para sustituirlo por las partes de acero de una parte concreta del tren de aterrizaje de las aeronaves

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[EN] The procedure presented in this work describe the mechanical assessment of a newly developed aeronautical composite material. First of all, a feasibility study was performed to identify the possible material that can be used as fabric and found out the kind of resin best suited for the composite. After this, it was proposed to produce composite plaques, which include a combination of fibers and resin. This way, plaques with different orientations and thicknesses of the layers were fabricated, and from these plaques, coupons were cut for performing the required experimental testing for characterizing the composite mechanically. The experimental tests were performed in an accredited test facility, and electromechanical machines were employed, and the tests conformed to ASTM specifications. Both tests generated stress–strain curves portraying a normal looking response till failure point was reached. An analysis of the distribution of parameters was carried out based on the results of the experimental tests and an estimation of a coefficient of variation to evaluate the reproducibility in different laboratories based on the statistical mean of these parameters. We aim at characterizing the influence of the manufacturing defects and the stress concentrator through a open hole in the specimens. The results revealed that manufacturing defects such as fiber waviness can have a major impact than open-hole stress concentrator on raising the material temperature and causing fracture. The quasi-static tensile tests showed that the strain distribution around the hole is able to predict the crack initiation and progression in the external plies

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URI: http://hdl.handle.net/10251/211514

Fecha: 2024-11-08

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