Abstract
To study glass/epoxy fiber orientation effects on translaminar fracture toughness under Mixed mode(I/II) load using asymmetric Four Point Bend specimen. Fracture toughness values for different fiber-oriented glass/epoxy laminates under Mixed modes are compared with unidirectional glass/epoxy laminates. Specimens were fabricated using hand layup technique with (0/45)° and (0/90)° fiber oriented glass fiber. The experimental study was conducted for 6 crack positions varying from 0 to 1 with an increment of 0.2 for Four Point Bend specimen. The specimens were tested under universal testing machine to obtain peak loads and further evaluate fracture toughness. The experimental test results show fracture toughness can be increased by orienting the fiber in the laminate. Fracture toughness is highly dominating for (0/90)° fiber-oriented laminates compared to 0° and (0/45)° glass/epoxy laminates.
Highlights
Fracture mechanics role in providing engineers and researchers with vital informations for designing and prediction of crack initiation and orientation with its propagation path under Mixed-mode loading is desirable for life prediction of engineering materials [1,2]
This note was prompted by a comparison of existing numerical solutions for the crack specimen known as the asymmetric Four Point Bend (FPB) specimen
The critical stress intensity factor (KIC & KIIC) value was calculated from this peak load by equations that have been established on specimens of the type described in He and Hutchinson [3]
Summary
Fracture mechanics role in providing engineers and researchers with vital informations for designing and prediction of crack initiation and orientation with its propagation path under Mixed-mode loading is desirable for life prediction of engineering materials [1,2]. Asymmetric Four Point Bend; Stress Intensity Factor; Mixed mode I/II. For glass/epoxy polymer composites used in aerospace application comes under failure by Mixed mode loading under translaminar fracture. He and Hutchinson [2] provided accurate results for the stress intensity factors for the asymmetric Four Point Bend (FPB) specimen with an edge crack.
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