Abstract
This paper presents the tensile response of thin-walled composite tubes with multi-axial fibre architecture. A hybrid braid-wound layup has the potential to optimise the composite tube properties, however, stacking sequence plays a role in the failure mechanism. A braid-winding method has been used to produce stacked overwound braid layup [(±45°/0°)5/90°4]T. Influence of stacking sequence on premature failure of hoop layers has been reported. Under tensile loading, a cross-ply composite tube with the alternate stacking of hoop and axial fibre show hoop plies splitting similar to the overwound braided composite tube. However, splitting has been restricted by the surrounding axial plies and contained between the adjacent axial fibre tows. This observation suggests hoop layers sandwiched between braid layers will improve structural integrity. A near net shape architecture with three fibre orientation in a triaxial braid will provide additional support to prevent extensive damage for plies loaded in off-axis. Several notable observations for relatively open braid structures such as tow scissoring, high Poisson’s ratio and influence of axial tow crimp on the strain to failure have been reported. Digital Image Correlation (DIC) in conjunction with surface strain gauging has been employed to capture the strain pattern.
Highlights
Cylindrical composites structures such as pressure vessels, tubes, pipes, shafts etc. are widely manufactured using filament winding technology
Triaxially-braided, cross-ply and overwound braided composite tubes were used for this study under tensile loading
A braid structure with the uncovered surface was produced followed by a layer stacking that improved surface coverage and distribution of the axial tows around the circumference
Summary
Cylindrical composites structures such as pressure vessels, tubes, pipes, shafts etc. are widely manufactured using filament winding technology. Are widely manufactured using filament winding technology It is an established method of fabrication in the industry compared to other techniques such as fabric or tape wrapping and braiding for developing composite tubes. The process has a limitation in placing axial fibres (at 0°) along the longitudinal axis of the tube. The respective limitations of both braiding and FW create the possibility for fabricating preforms by combining both layup techniques to optimise the fibre angles required to fabricate preforms for a tubular composite. A limited number of tests was carried out on these two types of composite tubes with triaxially braided and cross-ply layup. Failure process of hoop layup for two types of tubes was described with strain measurements from strain gauges as well as digital image correlation (DIC). The failure process of the composite tubes was discussed using surface strain analysis
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
