Static and fatigue tensile properties of carbon/glass hybrid fiber-reinforced epoxy composites
Kimiyoshi Naito
Abstract
Abstract The static and fatigue tensile properties of high-strength polyacrylonitrile (PAN)-based carbon (IMS60) and electronic (E)-class glass (E-glass) hybrid fiber-reinforced epoxy matrix composites (HFRPs) were investigated. The fiber orientations of the HFRP specimens were set to unidirectional with [(0 (IMS60) )/(0 (E-glass) )] S (subscript S means symmetry and [(0 (IMS60) )/(0 (E-glass) )/(0 (E-glass) )/(0 (IMS60) )]), [(0 (E-glass) )/(0 (IMS60) )] S , [(0 (E-glass) )/(0 (IMS60) ) 2 ] S , [(0 (E-glass) )/(0 (IMS60) ) 3 ] S , [(0 (E-glass) )/(0 (IMS60) ) 5 ] S , [(0 (E-glass) ) 2 /(0 (IMS60) )] S , [(0 (E-glass) ) 3 /(0 (IMS60) )] S , and [(0 (E-glass) ) 5 /(0 (IMS60) )] S . Under static loading for the [(0 (IMS60) )/(0 (E-glass) )] S , [(0 (E-glass) )/(0 (IMS60) )] S , [(0 (E-glass) )/(0 (IMS60) ) 2 ] S , [(0 (E-glass) )/(0 (IMS60) ) 3 ] S , and [(0 (E-glass) )/(0 (IMS60) ) 5 ] S HFRP specimens, the stress applied to the specimen was almost linearly proportional to the strain until failure. However, the tensile stress–strain curves of the [(0 (E-glass) ) 2 /(0 (IMS60) )] S , [(0 (E-glass) ) 3 /(0 (IMS60) )] S , and [(0 (E-glass) ) 5 /(0 (IMS60) )] S HFRP specimens had a complicated shape (jagged trace). The Weibull statistical distributions of the tensile strength values were also examined. The Weibull moduli for the [(0 (E-glass) )/(0 (IMS60) )] S , [(0 (E-glass) )/(0 (IMS60) ) 2 ] S , [(0 (E-glass) )/(0 (IMS60) ) 3 ] S , [(0 (E-glass) )/(0 (IMS60) ) 5 ] S , [(0 (E-glass) ) 2 /(0 (IMS60) )] S , [(0 (E-glass) ) 3 /(0 (IMS60) )] S , and [(0 (E-glass) ) 5 /(0 (IMS60) )] S HFRP specimens were higher than those for the mono carbon fiber-reinforced epoxy (CFRP) and glass fiber-reinforced epoxy (GFRP) specimens. Under fatigue loading, the fatigue properties of the HFRP specimens showed CFRP-dominant behaviour at high stress levels and GFRP-dominant behaviour at low stress levels. The fatigue properties of the HFRP specimens increased with increasing volume fraction of CFRP in the following order: ([(0 (E-glass) )/(0 (IMS60) ) 5 ] S > [(0 (E-glass) )/(0 (IMS60) ) 3 ] S > [(0 (E-glass) )/(0 (IMS60) ) 2 ] S > [(0 (IMS60) )/(0 (E-glass) )] S > [(0 (E-glass) )/(0 (IMS60) )] S > [(0 (E-glass) ) 2 /(0 (IMS60) )] S > [(0 (E-glass) ) 3 /(0 (IMS60) )] S > [(0 (E-glass) ) 5 /(0 (IMS60) )] S ).