Abstract
The effect of the winding angle of filament wound pipes internally pressurized was investigated by means of the acoustic emission technique. The acoustic emission results were correlated with the theoretical data of the state of stress at the matrix-fibre boundary. The experimental results showed that acoustic emission strongly depended on fibre orientation. Acoustic emission signals were mainly caused by two types of failure of the composite: debonding on the matrix-fibre interface and transverse cracks in the lamina. The influence of fibre rotation on the acoustic emission behaviour was also taken into account. It is stated that the significant start of acoustic emission is due to cohesive cracking at the matrix-fibre boundary when the normal stress, σ⊥ to the fibre overreached the critical value of 11.5 MPa for all considered fibre orientations.
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