Banca de DEFESA: PAULO VICTOR DE ASSIS
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : PAULO VICTOR DE ASSIS
DATE: 21/09/2023
TIME: 14:00
LOCAL: Defesa será remota através do link https://meet.google.com/sby-aisk-tcz
TITLE:
PHYSICAL AND MECHANICAL CHARACTERIZATION OF POLYMER COMPOSITES REINFORCED WITH JUTE CORDS
KEY WORDS:
composites, staple jute fibers, castor oil, mechanical properties, numerical simulation.
PAGES: 82
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Mecânica dos Sólidos
SPECIALTY: Análise de Tensões
SUMMARY:
Composite materials can have excellent mechanical properties between the combination of materials and fiber orientation in order to produce optimized and specific structures for each application. When considering factors such as low cost, low density and the search for biodegradable materials, natural fibers and resins obtained from renewable sources has gained relevance in the production of composite structures. Thus, the present work aims to investigate, through a complete 22 factorial design, the effect of the matrix phase, epoxy resin or castor oil, and the reinforcement stage arrangement, unidirectional staple fibers or bidirectional fabric, on the physical and mechanical performance of polymer composites reinforced with jute staple fibers. The reinforcement phases jute staple fibers and bidirectional jute fabric were characterized by mechanical tensile test. The composite materials were characterized in tensile, bending, impact, apparent density, apparent porosity and water absorption tests. The mechanical behavior of composites reinforced with unidirectional staple fibers for three-point bending was investigated through numerical simulation with a nonlinear implicit and incremental formulation. The experimental study indicated that the use of castor oil as a matrix phase reduced the apparent density of the composites and increased the impact resistance. However, it also provided an increase in apparent porosity and water absorption, and reduced the flexural strength of the composites. The alteration of phase reinforcement in materials from bidirectional fabric to unidirectional staple fibers caused expressive increase in all mechanical properties. The averages of physical properties of apparent density, apparent porosity and water absorption were not statistically altered by changing the arrangement of cords. The composite made of epoxy resin and unidirectional staple jute fibers presented the best mechanical behavior in tensile and bending tests. Numerical simulations were well correlated with experimental tests for small displacements. The tensile modulus for the jute fiber obtained by numerical simulation was in line with the values found in the literature. The manufactured composite materials proved to be a sustainable and economical alternative for engineering applications, mainly those manufactured with unidirectional staple jute fibers, which exhibited satisfactory mechanical properties.
BANKING MEMBERS:
Presidente - 1716349 - MARCIO EDUARDO SILVEIRA
Interno - 1691537 - TULIO HALLAK PANZERA
Interno - 1827328 - RODRIGO TEIXEIRA SANTOS FREIRE
Externo à Instituição - ANTÔNIO CARLOS ANCELOTTI JUNIOR - UNIFEI