Static and fatigue tensile properties of carbon/glass hybrid fiber-reinforced epoxy composites

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)).