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Abstract(s)
A deterioração do meio ambiente tem levado a uma crescente preocupação de ordem ambiental, sendo que existe uma necessidade premente de promover a reciclagem dos materiais usados em Engenharia.
O aumento da utilização de materiais compósitos nas mais variadas indústrias, conjugado com a preocupação pelo meio ambiente, tem promovido o estudo sobre a incorporação de materiais de origem natural em materiais compósitos, de modo a reduzir o impacto ambiental dos mesmos. Esta necessidade constitui uma vertente a explorar sempre que as aplicações em causa assim o permitirem e sem comprometer os desempenhos conseguidos através de materiais como os polímeros de origem sintética.
Apesar de existirem estudos que incidem sobre a utilização de fibras ou outros agentes de reforço de origem natural, existe ainda necessidade de desenvolver estudos mais aprofundados conducentes à caracterização do comportamento mecânico destes materiais sendo por isso uma área de investigação emergente e que se pretende desenvolver no corrente trabalho.
Com a modelação por elementos finitos de compósitos reforçados a fibra de cânhamo, conclui-se que o desempenho do material, face ao aumento da percentagem do volume de fibra no domínio do estudo, apresenta uma melhoria das suas propriedades. Do mesmo modo conclui-se que o Módulo de Elasticidade na direção das fibras (E1) demonstra grande influência nas propriedades finais do material. Assim, é possível a avaliação do seu interesse e aplicabilidade no ramo da Engenharia.
The deterioration of the environment has led to a growing concern for the well-being of the environment, and there is a pressing need to promote the recycling of materials used in Engineering. The increase in the use of composite materials in the most varied industries, coupled with the concern for the environment, has promoted the need to study and incorporate materials of natural origin in composite materials, in order to reduce their environmental impact. This necessity is an area of science to be explored wherever the materials and their applications permit and without compromising the performances achieved for example through other materials, such as polymers of synthetic origin. Although there are studies that focus on the use of fibers or other reinforcing agents of natural origin as well the use of resin of natural origin, there is still a need to develop more in-depth studies leading to the characterization of the mechanical behavior of these materials and therefore is an emerging area of research and one that is intended to develop in the current work. The analysis of the modelation using the Finite Element Method of the hemp fiber reinforced composites, allows to conclude that the performance of the material, due to the increase of the fiber volume percentage in the studied area, shows an improvement of its properties. In addition, the direction of the fibers shows great influence on the final properties of the material. Thus, it is possible to evaluate their interest and applicability in the field of engineering.
The deterioration of the environment has led to a growing concern for the well-being of the environment, and there is a pressing need to promote the recycling of materials used in Engineering. The increase in the use of composite materials in the most varied industries, coupled with the concern for the environment, has promoted the need to study and incorporate materials of natural origin in composite materials, in order to reduce their environmental impact. This necessity is an area of science to be explored wherever the materials and their applications permit and without compromising the performances achieved for example through other materials, such as polymers of synthetic origin. Although there are studies that focus on the use of fibers or other reinforcing agents of natural origin as well the use of resin of natural origin, there is still a need to develop more in-depth studies leading to the characterization of the mechanical behavior of these materials and therefore is an emerging area of research and one that is intended to develop in the current work. The analysis of the modelation using the Finite Element Method of the hemp fiber reinforced composites, allows to conclude that the performance of the material, due to the increase of the fiber volume percentage in the studied area, shows an improvement of its properties. In addition, the direction of the fibers shows great influence on the final properties of the material. Thus, it is possible to evaluate their interest and applicability in the field of engineering.
Description
Trabalho final de mestrado para obtenção do grau de mestre em Engenharia Mecânica
Keywords
Compósitos naturais Natural composites Fibras naturais Natural fibres Resina epoxídica Epoxy resin Fibra de cânhamo Hemp fibre Modelação FEM FEM modulation
Citation
TOMAR, Sara de Melo - Comportamento mecânico de materiais compósitos de origem natural. Lisboa: Instituto Superior de Engenharia de Lisboa, 2018. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa