Material characterisation and failure envelope evaluation of filament wound GFRP and CFRP composite tubes

Abstract

a b s t r a c tThe full procedure for material characterisation of filament wound composite pipe is reported. Two different typologies of composite were used in order to evaluate the performance of the developed test methodology. Test samples were produced with glass/ vinylester and carbon/epoxy in tubular section by filament winding. Split disk and biaxial tests were used to evaluate the basic in plane material properties. A new design for the biaxial test was developed. The end tabs and fixture were made in order to reduce the stress concentration at the edges of the samples and to remove any possibility of sample misalignment. The influence of the sample length as well as the sample preparation was investigated and the best solution reported. Moreover, an innovative optical method was developed for the evaluation of the void content of the produced material.In addition to the basic strength data, the complete failure envelopes in the plane s 2 À t 12 were also evaluated for both materials by the use of the biaxial test procedure here developed. The experimental failure envelopes were also compared with the prediction made with some of the most common failure theories currently available. The results clearly showed the ability of the Puck criterion to accurately predict the failure envelope (especially when torsion plus axial compressive loads were applied to the samples).

Curing and seawater aging effects on mechanical and physical properties of glass/epoxy filament wound cylinders

“…Failure is characterized by a long offaxis crack along the fiber direction. Similar results have been found by Perillo et al [12], and Eggers et al [13].…”

Tragverhalten von Betondruckgliedern mit Umschnürung durch geflochtene und gewickelte Carbonrohre

“…Perillo et al wenden den Split‐Disk‐Test und weitere Untersuchungen an, um vollständige biaxiale Materialkennwerte und Bruchgrenzflächen zu erhalten. Hier werden Parameter in Umfangsrichtung ermittelt, da in dieser Richtung ein Versagen durch Aufreißen eintritt, wie die CFK‐Betonproben zeigen.…”

Numerical‐experimental structural instability analysis of composite tubes considering manufacturing parameters and imperfections

“…However, flat specimens manufactured by filament winding may not represent the actual state of the material produced as a surface of revolution due to differences in compaction degree. [ 16 ] Also, the available standardized procedures for tubular samples [ 16 ] are laborious and time consuming. Due to that, many engineers opt for nonstandard tests that better represent the manufactured component, [ 16,17 ] but alternative and more economical methods to characterize composites produced by filament winding are still required.…”

“…[ 16 ] Also, the available standardized procedures for tubular samples [ 16 ] are laborious and time consuming. Due to that, many engineers opt for nonstandard tests that better represent the manufactured component, [ 16,17 ] but alternative and more economical methods to characterize composites produced by filament winding are still required.…”