Banca de QUALIFICAÇÃO: ALLANA AZEVEDO DO NASCIMENTO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ALLANA AZEVEDO DO NASCIMENTO
DATA : 13/12/2016
HORA: 13:00
LOCAL: Sala de aulas do PPGCEM
TÍTULO:

Effects of Humidity on Carbon-Epoxy Composites

PALAVRAS-CHAVES:

Composites, carbon-epoxy, moisture absorption, moisture diffusion coefficient, hygrothermal aging.

PÁGINAS: 70
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Polímeros, Aplicações
RESUMO:

Composite materials have been increasingly used due to their improved properties, which include a combination of superior mechanical properties and low specific weight. Carbon fiber reinforced epoxy composites are advantageous for applications with high structural demand, such as components for marine, aeronautic and aerospace industries. When subjected to service conditions, these materials are often exposed to a variety of environmental conditions, which may cause degradation. Moisture is known to produce physical and chemical changes in the polymer structure and to affect fiber-matrix interface of polymer-based composites with consequent detrimental effects to the composite properties. Moisture diffusion in composites is a matrixdominated phenomena intensified by increased temperatures. In this study, carbon fiber/epoxy laminates were immersed in water at 70 °C in order to calculate the through-the-thickness moisture diffusivity. Effects of moisture exposure on the material were evaluated by Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM). Ultimately, this study contributes to the understanding of moisture diffusion into carbon fiber/epoxy composites and the effects of hygrothermal aging. FTIR and SEM Results shows chemical changes and degradation of the matrix material, respectively and initial values of moisture uptake are according to literature data. Interlaminar Shear Strenght (ILSS) and Dynamic Mechanical Analysis (DMA) are planned in order to evaluate mechanical properties of the composites before and after accelerated aging.

MEMBROS DA BANCA:
Presidente - 2042234 - ANA PAULA CYSNE BARBOSA
Interno - 1202134 - JOSE DANIEL DINIZ MELO
Interno - 1755267 - MARIA CAROLINA BURGOS COSTA DO NASCIMENTO
Interno - 1883170 - MAURÍCIO ROBERTO BOMIO DELMONTE