Paper number 654

FRACTURE ANALYSIS OF FILAMENT-WOUND FRP COMPOSITES USING RING BURST TEST

Shuichi Wakayama, Akihiro Horide and Masanori Kawahara

Department of Mechanical Engineering, Tokyo Metropolitan University,
1-1 Minami-Ohsawa, Hachioji-shi, Tokyo 192-0397, Japan

Summary

New testing technique, ring burst test, was developed for the investigation of the fracture behavior of filament winding (FW)-FRP composites. The internal pressure can be applied to the ring shaped specimens similarly to the burst tests of actual pressure vessels. The uniform deformation in specimen was confirmed by strain measurement and FEM analysis. It is important that the fracture behavior inside of the FRP layers could be observed directly while it is impossible to observe the fracture behavior under the surface of actual pressure vessels. In order to demonstrate the advantages of ring burst test, the fracture analysis of FW-FRP, with the various degree of fiber waviness, was carried out using in situ observation and AE measurement. Consequently, the effect of fiber waviness on the strength of FW-FRP was understood by using ring burst test.

Keywords

filament wound FRP composite, ring burst test, FEM analysis, strain distribution, NOL ring tensile test, acoustic emission analysis, fiber waviness.