THE INFLUENCE OF FIBER ORIENTATION ANGLE ON HOOP TENSILE CHARACTERISTICS OF BASALT FIBER REINFORCED COMPOSITE PIPES

Authors : Özkan Özbek, Ömer Yavuz Bozkurt

Pages : 150-159

View : 26 | Download : 12

Publication Date : 2020-12-31

Article Type : Research

Abstract :This paper aimed to investigate the effect of fiber orientation angle on hoop tensile properties of basalt/epoxy fiber reinforced composites (BFRP). The filament wound ring-shaped samples having six layers were prepared with three different fiber orientations (±40⁰, ±55⁰ and ±70⁰) and subjected to tensile loading in hoop direction with respect to the split disk method. Furthermore, failure modes and fracture mechanisms of damaged samples were examined to establish the influence of fiber orientation angles. The results showed that fiber orientation had significant influences on the hoop tensile properties of BFRP samples. It was seen that remarkable increases were achieved in apparent hoop tensile strength and modulus for higher fiber orientation angles. The samples with ±70⁰ fiber orientation angle exhibiting 411.36 MPa strength and 21.06 GPa modulus values showed 5.3 and 4.8 times of the sample with ±40⁰ (77.74 MPa and 4.39 GPa) for apparent hoop tensile strength and modulus, respectively. This was attributed to more load bearing capacity as a result of fiber alignment along the load axis at higher fiber orientations. Matrix cracking, delamination and fiber debonding were seen as common failure modes for all samples and fiber pull-outs were observed for samples with higher fiber orientations.
Keywords : Basalt fiber, Fiber orientation, Hoop tensile, Filament winding, Composite pipe