Summary
Beams of a composite made from wood and fibreglass layers glued with a phenolic adhesive were tested in three point bending. Experimental results indicate an increase in mechanical properties in comparison with equivalent beams without fibreglass. An interesting modification is obtained in the mode of fracture. Values of the modulus of elasticity for the adhesive, fibreglass and wood were obtained in separate loading tests and used to derive the modulus of the composite using a general relationship for layered systems. Good agreement was found between theoretical and experimental values of modulus.
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Abbreviations
- σ r :
-
Ultimate stress
- E:
-
Modulus of elasticity
- I:
-
Moment of intertia
- δ :
-
Experimental reinforcement obtained on E with respect to normal laminated beam
- Δ :
-
Theoretical reinforcement obtained on E with respect to normal laminated beam
- μ :
-
Mean
- D:
-
Standard deviation
- b:
-
Subscript for wood
- f:
-
Subscript for fibreglass
- c:
-
Subscript for glue
- lcr:
-
Subscript for composite
References
Biblis, E. J. 1965: Analysis of wood-fiberglass beams within and beyond the elastic region. Forest Prod. J. 15: 81–88
Bodig, J.; Jayne, B. A. 1982: Mechanics of wood and wood composites. New York: Van Nostrand Reinhold Co.
Chardenon, J. 1982: Le peuplier. Paris: Institut pour le Dévelopment Forestier
Jayatilaka, A. de S. 1979: Fracture of engineering brittle materials. London: Applied Science Publishers LTD
Wangaard, F. F. 1965: Elastic deflection of wood-fiberglass composite beams Forest Prod. J. 15: 256–260
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Moulin, J.M., Pluvinage, G. & Jodin, P. FGRG: Fibreglass reinforced gluelam — A new composite. Wood Sci.Technol. 24, 289–294 (1990). https://doi.org/10.1007/BF01153561
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DOI: https://doi.org/10.1007/BF01153561