Fatigue failure analysis of surface-cracked (±45°)3 filament-wound GRP pipes under internal pressure
Tóm tắt
In this study, the fatigue behavior of (±45°)3 filament-wound composite pipes with a surface crack under alternating internal pressure was investigated. Glass-reinforced plastic (GRP) pipes were made of E-glass/epoxy and tested in the open-ended condition. The pipes had a surface crack with a notch–aspect ratio of a/c = 0.2 and notch-to-thickness ratios of a/t = 0.25, 0.38, or 0.50 in the axial direction. Tests were carried out in accordance with ASTM D2992. This standard offers 25 cycles/min and a load ratio of R = 0.05. Tests were performed at three different load levels: 50%, 40%, and 30% of ultimate hoop stress. Whitening, leakage, and final failure of GRP pipes were observed, and fatigue test results were presented by means of S–N curves.
Từ khóa
Tài liệu tham khảo
Wolodgo J, 1999, Biaxial fatigue and leakage characteristics of fiber reinforced composite tubes
Standard practice for obtaining hydrostatic or pressure design basis for “fiberglass” (glass-fiber-reinforced thermosetting resin) pipe and fittings. American Society for Testing Materials (ASTM) designation: D2992-91.