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Abstract(s)
Os materiais compĆ³sitos polimĆ©ricos, devido Ć s suas propriedades intrĆnsecas, tĆŖm vindo
a ser utilizados cada vez mais nas mais diversas Ɣreas da engenharia. Neste sentido, Ʃ
expectƔvel que a possibilidade de ocorrerem falhas tambƩm se torne cada vez maior.
Atualmente, o estudo da fadiga fretting em laminados compĆ³sitos polimĆ©ricos tem sido
pouco explorado e Ć© cada vez mais importante devido a estes substituĆrem cada vez mais
os tradicionais materiais metƔlicos. Assim, este trabalho tem como objetivo analisar o
comportamento Ć fadiga fretting, com recurso a ensaios experimentais, de laminados
compĆ³sitos de aramida e laminados compĆ³sitos hĆbridos de aramida/carbono. O
trabalho experimental foi realizado no LIM (Laboratorio de IngenierĆa MecĆ”nica) do
DIMF (Departamento de IngenierĆa MecĆ”nica y FabricaciĆ³n) da ETSI (Escuela TĆ©cnica
Superior de IngenierĆa) da US (Universidad de Sevilla). Os ensaios de fadiga fretting
foram realizados nos compĆ³sitos com pontes de contacto cilĆndrico de AISI 304, com
uma configuraĆ§Ć£o de contacto cilindro-plano, e realizados numa mĆ”quina de ensaios
MTS 810 para diferentes nĆveis de carga, frequĆŖncia constante (8 ????) e condiƧƵes
ambiente. Verificou-se que para as cargas cĆclicas mais elevadas o fretting nĆ£o influencia
a vida Ćŗtil do laminado. No entanto, o efeito do fretting intensifica-se Ć medida que a
tensĆ£o mĆ”xima diminui. TambĆ©m se verificou que nĆ£o existe uma influĆŖncia significativa
na vida Ć fadiga para ambos os laminados na gama das cargas normais aplicadas (dos 6
aos 11 ????).
Polymeric composite materials, due to their intrinsic properties, have been increasingly used in various areas of engineering. In this sense, it is expected that the possibility of failure also becomes increasingly higher. Currently, the study of fretting fatigue in polymeric composite laminates has been little explored and it is increasingly important due to the fact that these are increasingly replacing the traditional metallic materials. Thus, this work aims to analyse the fretting fatigue behaviour, using experimental tests, of aramid composite laminates and aramid/carbon hybrid composite laminates. The experimental work was carried out at the LIM (Laboratorio de IngenierĆa MecĆ”nica) of the DIMF (Departamento de IngenierĆa MecĆ”nica y FabricaciĆ³n) of the ETSI (Escuela TĆ©cnica Superior de IngenierĆa) at the US (Universidad de Sevilla). The fretting fatigue tests were performed on the composites with cylindrical contact bridges of AISI 304, with a cylinder-plane contact configuration, and performed in an MTS 810 testing machine for different load levels, constant frequency (8 ????) and ambient conditions. It was found that for the highest cyclic loads, fretting does not influence the laminate life. However, the effect of fretting intensifies as the maximum stress decreases. It was also found that there is no significant influence on fatigue life for both laminates in the range of applied normal loads (from 6 to 11 ????).
Polymeric composite materials, due to their intrinsic properties, have been increasingly used in various areas of engineering. In this sense, it is expected that the possibility of failure also becomes increasingly higher. Currently, the study of fretting fatigue in polymeric composite laminates has been little explored and it is increasingly important due to the fact that these are increasingly replacing the traditional metallic materials. Thus, this work aims to analyse the fretting fatigue behaviour, using experimental tests, of aramid composite laminates and aramid/carbon hybrid composite laminates. The experimental work was carried out at the LIM (Laboratorio de IngenierĆa MecĆ”nica) of the DIMF (Departamento de IngenierĆa MecĆ”nica y FabricaciĆ³n) of the ETSI (Escuela TĆ©cnica Superior de IngenierĆa) at the US (Universidad de Sevilla). The fretting fatigue tests were performed on the composites with cylindrical contact bridges of AISI 304, with a cylinder-plane contact configuration, and performed in an MTS 810 testing machine for different load levels, constant frequency (8 ????) and ambient conditions. It was found that for the highest cyclic loads, fretting does not influence the laminate life. However, the effect of fretting intensifies as the maximum stress decreases. It was also found that there is no significant influence on fatigue life for both laminates in the range of applied normal loads (from 6 to 11 ????).
Description
Keywords
Aramida Carbono Fadiga Fretting HibridizaĆ§Ć£o Laminados CompĆ³sitos