Paper number 775

FAILURE OF SOLID AND HOLLOW S2-GLASS FIBRE/EPOXY THICK TUBES UNDER BIAXIAL COMPRESSION

A S Kaddour1, P D Soden1 and M J Hinton2

1Mechanical Engineering Department, UMIST, P O Box 88, Sackville Street, Manchester, M60 1QD, UK.
2Structural Materials Centre, Defence Evaluation and Research Agency (DERA), Fort Halstead, Sevenoaks, Kent, TN14 7BP, UK.

Summary A comparative study is made of the biaxial compressive response of five tubes of different composite materials ( solid and hollow fibre S2-glass/epoxy, E-glass/epoxy, T700 carbon/epoxy and Tenax carbon/epoxy). The specimens were 55( angle-ply thick filament wound tubes which were tested to destruction under combined external radial pressure and axial compression that gave a nominal circumferential to axial stress ratio of -2:-1, commonly encountered in submersibles. Depending upon the material tested, it was necessary to test tubes with radius to thickness ratios R/h down to 2.8 in order to avoid structural instability and obtain material crushing, especially for the hollow fibre tubes. The specific compressive strength (strength/weight) obtained from the hollow glass tubes was observed to be comparable with those from the solid glass/tubes. The carbon fibre reinforced materials were superior to the glass fibre composites.
Keywords external pressure, biaxial-compression, thick walled 55 angle ply tubes, hollow, solid S2-glass/epoxy composite.

Theme : Composite Structures ; Thick Composites

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