Compressive failure of spruce wood rings reinforced with glass epoxy composite

Abstract

We experimentally tested under radial compressive loads and statistically analyzed rings constructed from spruce wood and reinforced with glass fiber. We used the Weibull distribution in statistical analysis, and tested five types of rings including unreinforced and composite reinforced (CR) as wound around the ring, oriented as two layers at angles of 45°, 60°, 75° and 90° to the column axis. We calculated 95 % reliability of load carrying capacity of the rings by Weibull distribution. The highest load carrying capacity was obtained with CR rings at 60° to the axial axis of the ring. Load carrying capacities of rings at CR90, CR75, CR60 and CR45 were 137, 192, 215 and 126 % greater, respectively, than unreinforced rings. For unreinforced rings, failures resulted from catastrophic breaking of wood materials. None of the reinforced rings failed catastrophically because the outer surface of the rings was reinforced with glass–epoxy composite fiber. Cracks began at the core of the materials under the composite layer for all specimens and resulted in failure of the rings.

Keywords

Reinforced ring / Composite material / Composite reinforced / Spruce wood

References

[1] Aktas A. Statistical analysis of bearing strength of glass-fiber composite materials. J Reinf Plast Compos, 2007, 26: 555-564.

[2] Barbero E, Fernandez-Saez J, Navarro C. Statistical analysis of the mechanical properties of composite materials. Compos B, 2000, 31: 375-381.

[3] Cabrero JM, Heiduschke A, Haller P. Analytical assessment of the load carrying capacity of axially loaded wooden reinforced tubes. Compos Struct, 2010, 92: 2955-2965.

[4] Cabrero JM, Heiduschke A, Haller P (2010) Parametric analysis of composite reinforced wood tubes under axial compression. In: World conference on timber engineering

[5] Chellis RD. Deterioration and preservation of piles. Pile foundations. 1961, New York: McGraw-Hill, 339 372

[6] Dodson B. Weibull analysis. 1994, Milwaukee: American Society for Quality

[7] Fam A, Kim YJ, Son J. A numerical investigation into the response of free end tubular composite poles subjected to axial and lateral loads. Thin-Wall Struct, 2010, 48: 650-659.

[8] Guden M, Yuksel S, Tasdemirci A, Tanoglu M. Effect of aluminum closed-cell foam filling on the quasi-static axial crush performance of glass fiber reinforced polyester composite and aluminum/composite hybrid tubes. Compos Struct, 2007, 81: 480-490.

[9] Haller P. Concepts for textile reinforcements for timber structures. Mater Struct, 2007, 40: 107-118.

[10] Han TH, Han SY, Kang YJ (2007) Elastic buckling behavior characteristics of GFRP pipe with reinforced ribs, composites and polycon. American Composites Manufacturers Association, 17–19 Oct, Tampa

[11] Heiduschke A, Haller P. Fiber-reinforced plastic-confined wood profiles under axial compression. Int Assoc Bridge Struct Eng, 2010, 3: 246-253.

[12] Heiduschke A, Cabrero JM, Manthey C, Haller P, Günther E (2008) Mechanical behaviour and life cycle assessment of fibre-reinforced timber profiles. In: Braganca L, Koukkari H, Blok H, Cervasio R, Velkovic M, Plewako RUV, Landolfo Z, Silva L, Haller P (eds) Cost C25 sustainability of constructions-integrated approach to lifetime engineering. COST C-25. European Commission, Dresden, pp 3.38–3.46

[13] Ibrahim S, Polyzois D, Hassan SK. Development of glass fiber reinforced plastic poles for transmission and distribution lines. Can J Civil Eng, 2000, 27: 850-858.

[14] Kim YJ, Heffernan PJ. Fatigue behavior of externally strengthened concrete beams with fiber-reinforced polymers: state of the art. J Compos Constr, 2008, 12(3): 246-256.

[15] Shin KC, Lee JJ, Kim KH, Song MC, Huh JS. Axial crush and bending collapse of an aluminum/GFRP hybrid square tube and its energy absorption capability. Compos Struct, 2002, 57: 279-287.

[16] Yerlikaya NC, Aktas A. Enhancement of load-carrying capacity of corner joints in case-type furniture. Mater Des, 2012, 37: 393-401.