Abstract
The strength of fiber reinforced plastic (FRP) composite, E glass fiber/epoxy, was evaluated by the ring burst test. In order to control the fiber waviness in FW-FRP composite, the specimens were fabricated by a filament winding (FW) method, where the tension in fiber was controlled as the winding load was increased or decreased gradually. Experimental burst pressure was lower than the ideal value based on the law of mixture under homogeneous strain state. The cancellations of fiber waviness were observed by a high magnification video system. The cancellation behavior could be characterized using acoustic emission (AE) analysis and high magnification video system. In particular, the increasing winding tension specimens showed more remarkable cancellation behavior than the other specimens. Cancellations of fiber waviness seriously affected the reduction of burst pressure of FW-FRP multiply composite. In this study, the burst pressure of FW-FRP composite was enhanced by the control of winding tension as the load in fibers was decreased gradually. Then the experimental model of fracture behavior, in which fiber waviness could be considered, was proposed. The predicted values using the experimental model showed good agreement with experimental results.
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