Burst Testing of Filament-Wound Graphite-Epoxy Composite Cylindrical Tubes
Abstract
An experimental and analytical program was performed to elucidate the failure process of filament-wound graphite-epoxy tubes, especially the effects of wrinkled fibers and of proof testing on tube burst strength. Four types of tubes were tested: those free of flaws, those with a minor or severe helical wrinkle, and those with a hoop wrinkle. Tests included pressurization to burst, and single or multiple proof tests followed by burst. Data collection included burst pressure, acoustic emission events and energies, axial and hoop strains, and location of failure initiation. Tension and torsion tests were performed to determine Young's and shear moduli. Two optical techniques, shadow Moire and speckle interferometry, were adapted to investigate deformation modes of the tubes. Three types of analysis were performed: composite laminate theory, Weibull analysis of tube strength data, and finite-element analysis of stress distributions near wrinkles. Hoop wrinkles caused an average reduction in burst pressure of 14%; severe helical wrinkles caused an average reduction of 8%. Minor helical wrinkles had no effect. Proof pressures up to ^95% of burst and number of proof testing cycles had no noticeable effect on the average ultimate burst pressures of the tubes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2002
- Accession Number
- ADA410130
Entities
People
- D. J. Chang
- H. A. Katzman
- J. P. Nokes
- P. M. Adams
- S. T. Amimoto
Organizations
- The Aerospace Corporation