Effects of cross-sectional shape on the bending strength in furniture joints
Öz
Aim of the study: Tests were carried out to evaluate the ultimate bending strength of the circular and square cross sectioned furniture joint members and find out whether the form factor is applicable to the small specimens as they are applied to large specimens and compare the maximum bending strength and specific gravity values of these wood species to those that are specified in reference books.
Material and methods: The specimens were prepared from Red oak (Quercus rubra), Yellow poplar (Liriodendron tulipifera), Southern pine (Pinus sp.), Caobilla (Carapa guianensis), and Gmelina (Gmelina arborea). Based on five wood species by five replications, 25 square cross sectional (25 x 25 mm) specimens and 25 specimens which included 19 mm diameter circular mortise and tenon joints, a total of 50 specimens were prepared and tested under the static bending test according to related standards.
Main results: Results gave the primary indication that the form factor of 1.18 from square to circular cross section is applicable to small clear specimens; however, it should be noted that absolute conclusions require studies in much wider spectrum.
Research highlights: The results of this study indicate that designers and furniture engineers may obtain good estimates from 1.18 form factor and comparison of MOR values and specific gravity of the wood species with the book values.
Anahtar Kelimeler
Kaynakça
- Markwardt L. J. and Wilson, T.R.C., 1935. Strength and Related Properties of Woods Grown in The United States: Technical Bulletin No: 479, U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 99 pp.
- Wolfe, R.; Bodig, J., Lebow P., 2001. Derivation of Nominal Strength for Wood Utility Poles, Gen. Tech. Rep. FPL-GTR-128, Madison WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 11 pp.
- Newlin, J., Trayer, G., 1924. Form Factors of Beams Subjected to Transverse Loading, Rep. 181 to Nat. Advisory Committee for Aeronautics, Reprinted 1941 as Rep. 1310, Madison, WI: U. S. Department of Agriculture, Forest service Forest Products Laboratory.
- Erdil, Y.Z., Kasal, A., 2005. Bending Moment Capacity of Rectangular Mortise and Tenon Furniture Joints: Forest Products Journal, 55(12): 209-213.
- Eckelman, C.A., Erdil, Y.Z., Haviarova, E., 2002. Effect of Cross Holes on the Strength of Chair and Table Legs: Forest Product journals, 52 (5): 67-70.
- Efe, H., Zhang, J., Erdil, Y.Z., Kasal, A., 2005. Moment Capacity of Traditional and Alternative T-Type End-to-Side-Grain Furniture Joints: Forest Products Journal, 55(5): 69-73.
- American Society for Testing and Materials, 1983. Standart Methods of Testing Small Clear Specimens, Standard D 143 - 229, ASTM, West Conshohocken, Philadelphia.
- Chudnoff, M., 1984. Tropical Timbers of the World, Agricultural Handbook No.607, Madison WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 464 pp.