Theoretical investigation into the effect of the winding angle of the fibres on the strength of filament wound GRP pipes subjected to combined external pressure and axial compression

Abstract The delamination resistance of filament wound glass/epoxy cylinders has been characterized for a range of winding angles and fracture mode ratios using beam fracture specimens. The results reveal that the fracture resistance increases with increasing winding angle and mode II (shear) fraction (GII/G). It was also found that interlaced fiber bundles in the filament wound cylinder wall acted as effective crack arresters in mode I loading. To examine the sensitivity of delamination damage on the implosion behavior of cylinders, external pressure tests were performed on filament-wound glass/epoxy composite cylinders with artificial defects and impact damage. The results revealed that the cylinder strength was insensitive to the presence of single delaminations but impact damage caused reductions in failure pressure. The insensitivity of the failure pressure to a single delamination is attributed to the absence of buckling of the delaminated sublaminates before the cylinder wall collapsed. The impacted cylinders contained multiple delaminations, which caused local reduction in the compressive load capability and reduction in failure pressure.

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Stress and deformation of multiple winding angle hybrid filament-wound thick cylinder under axial loading and internal and external pressure

Composite Structures ◽

10.1016/j.compstruct.2015.05.036 ◽

2015 ◽

Vol 131 ◽

pp. 868-877 ◽

Cited By ~ 40

Author(s):

Jingzhong Xing ◽

Pei Geng ◽

Tao Yang

Keyword(s):

Axial Loading ◽

External Pressure ◽

Filament Wound ◽

Thick Cylinder ◽

Stress And Deformation ◽

Winding Angle

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Experimental Analysis of Kenaf Filament Wound Tubes under Axial Compression Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.660.778 ◽

2014 ◽

Vol 660 ◽

pp. 778-782

Author(s):

Iqbal Mokhtar ◽

Mohd Yazid Yahya ◽

Ab Saman Abd Kader ◽

Shukur Abu Hassan

Keyword(s):

Compressive Strength ◽

Axial Compression ◽

Compression Test ◽

Compressive Load ◽

Compression Load ◽

Filament Wound ◽

Filament Wound Composite ◽

Glass Tubes ◽

Winding Angle ◽

Early Indication

The objective of this study was to determine the strength of kenaf filament wound tubes under axial compression load. Kenaf is natural reinforcement fibre in which need to explore its capability to replace and compare with other common commercial reinforcement materials. Axial compression test was performed as early indication to identify the performance of kenaf filament wound composite tubes. Comparisons have been done towards basalt, e-glass and carbon tubes using polyester as a resin. Axial compression test of kenaf/polyester and kenaf/epoxy tubes were conducted with different winding angles involved which are 450, 550, 650 and 750. The result shows the 450 kenaf/epoxy tubes generated the higher compressive strength followed by other winding angle in the ascending order. The layer strength identification have been conducted in 550 winding angle sample in which indicate the increment layer of winding is uniform between one, two and three layers in ascending orders. Comparison between the different reinforcement materials show carbon tubes produced the higher compressive strength followed by e-glass, basalt and kenaf. Kenaf/epoxy recorded 38.7% lower the e-glass tubes. Kenaf/epoxy tubes were observed to identify the improvement from kenaf/polyester tubes and results shows at least 22% increment have been generated. It can be concluded that kenaf presence as a reinforcement material was successfully combine as composite system under axial compressive load as well as lead to the promising indication to be introduced in low load bearing application.

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Buckling of Circular Cylindrical Shells Using a Displacement Function

Journal of Engineering for Industry ◽

10.1115/1.3438513 ◽

1974 ◽

Vol 96 (4) ◽

pp. 1322-1327

Author(s):

Shun Cheng ◽

C. K. Chang

Keyword(s):

Boundary Conditions ◽

Axial Compression ◽

Cylindrical Shells ◽

External Pressure ◽

Displacement Function ◽

Combined Loading ◽

Trial Solution ◽

Governing Differential Equation ◽

Circular Cylindrical Shells ◽

The Stability

The buckling problem of circular cylindrical shells under axial compression, external pressure, and torsion is investigated using a displacement function φ. A governing differential equation for the stability of thin cylindrical shells under combined loading of axial compression, external pressure, and torsion is derived. A method for the solutions of this equation is also presented. The advantage in using the present equation over the customary three differential equations for displacements is that only one trial solution is needed in solving the buckling problems as shown in the paper. Four possible combinations of boundary conditions for a simply supported edge are treated. The case of a cylinder under axial compression is carried out in detail. For two types of simple supported boundary conditions, SS1 and SS2, the minimum critical axial buckling stress is found to be 43.5 percent of the well-known classical value Eh/R3(1−ν2) against the 50 percent of the classical value presently known.

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