Abstract
The mechanisms of crack nucleation and propagation in ± 55° angle ply sections of glass fibre polyester resin filament wound pipe tested in both stress and strain corrosion conditions have been studied using optical microscopy and scanning electron microscopy. The failure processes are compared with similar tests in hoop wound pipe. Four distinct stages of deformation and fracture have been identified. Stress and strain corrosion failure is associated with fibre fracture and characteristic planar fracture surfaces are obtained. The main difference between ± 55° sections and hoop wound sections is the occurrence of transverse cracking in the ± 55° sections in the initial loading stage. These cracks allow acid to penetrate through the inner lamina and lead to an enhanced stress corrosion cracking effect. The results are interpreted in terms of the stress acting parallel and perpendicular to the fibres.
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