Improvement of the bending moment capacity of mitered MDF frame under diagonal tension by using of the densified poplar dowel

Document Type : Research Paper

Authors

1 Assistant prof. of Wood Science and Technology, Department of Natural Resources, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili. Ardabil, Iran.

2 university of mohagheghe ardabili

3 Assistant Professor, Department of Wood Science and Technology, Faculty of Natural Resources, University of Zabol, Zabol, Iran

4 BSc student of of Wood Science and Technology, Department of Natural Resources, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili. Ardabil, Iran.

Abstract

The aim of this study was to improve the joints of the mitered furniture frames by using the densified poplar dowels (Populus alba) instead of beech dowels. Therefore, the effects of the dowel number (one and two dowels), dowel diameter (8, 10, and 12mm), and compression ratio (0, 15, and 30%) on bending moment capacity of L-shaped frame corner joints constructed of medium-density fiberboard (MDF) under diagonal tension load were investigated. Then, their performance was compared with those manufactured with beech dowels. Polyvinyl chloride (PVA) was used for gluing the joints. Diagonal loading was performed by Hounsfield (model No. 0380) testing machine with a 5 mm/min loading rate. The results revealed that the bending moment capacity of joints was increased 105.5, 54.3, and 28.75% respectively with the increase of the dowel number, dowel diameter, and compression ratio. The highest bending moment capacity was observed in the joints made out of two 30% compressed dowels with a diameter of 10 mm, and the least of them were seen in joints constructed of one uncompressed dowel with a diameter of 8 mm. the comparison of the joints dowelled by poplar with beech showed that the difference among the bending moment capacity of joints made of poplar dowels with 30% compression ratio and beech dowels was very small (less than one percent), which indicates usability of the densified poplar dowels instead of beech ones.

Keywords


[1] Maleki, S., Haftkhani, A.R., Dalvand, M., Faezipour, M. and Tajvidi, M., 2012. Bending moment resistance of corner joints constructed with spline under diagonal tension and compression. Journal of Forestry Research, 23 (3): 481-490.
[2] Atar, M., Ozcifci, A., Altinok, M. and Celikel, U., 2009. Determination of diagonal compression and tension performances for case furniture corner joints constructed with wood biscuits. Materials & Design, 30 (3): 665-670.
[3] Dalvand, M., Ebrahimi, G., Haftkhani, A.R. and Maleki, S., 2013. Analysis of factors affecting diagonal tension and compression capacity of corner joints in furniture frames fabricated with dovetail key. Journal of Forestry Research, 24 (1): 155-168.
[4] Dalvand, M. and Moradpour, P., 2017. Analysis of stress-strain distribution of dowel and glue line in L-type furniture joint by means of finite element method. Iranian Journal of Wood and Paper Industries, 8 (2): 297-307.
[5] Dalvand, M., Maleki, S., Ebrahimi, G. and Rostampour, A., 2014. Investigating the Stress Carrying Capacity of Corner Joints In The Furniture Frame Fabricated With Dowel. Iranian Journal of Wood and Paper Industries, 5 (1): 21-32.
[6] Altun, S., Burdurlu, E. and Kılıç, M., 2010. Effect of adhesive type on the bending moment capacity of miter frame corner joints. BioResources, 5 (3): 1473-1483.
[7] Bahmani, M., Ebrahimi, G. and Veysi, J., 2010. Design of experimental model for predicting ultimate bending strength dowel joint in medium density fiber (MDF). Journal of forest and wood products (JFWP) (iranian journal of natural resources) 62 (4): 8.
[8] Dalvand, M., Ebrahimi, G., Tajvidi, M. and Layeghi, M., 2013. Investigation on the effect of wooden dowel diameter, penetration depth and species on the bending moment resistance under diagonal tensile load of corner joints in case-type furniture. Iranian Journal of Wood and Paper Science Research, 28 (1): 11-23.
[9] Chen, M. and Lyu, J., 2018. Properties of double dowel joints constructed of Medium Density Fiberboard. Maderas. Ciencia y tecnología, 20 (3): 369-380.
[10] Derikvand, M. and Eckelman, C.A., 2015. Bending moment capacity of L-shaped mitered frame joints constructed of MDF and particleboard. BioResources, 10 (3): 5677-5690.
[11] Mohammadi, A., Tabarsa, T. and Tasooji, M., 2011. Effect of static densification of treated paulownia wood on relationship between strength and density. Iranian Journal of Wood and Paper Science Research, 26 (3): 592-604.
[12] Sakalo, M. and Khazaian, A., 2012. The Effect of Chemical Modification with Phenol Formaldehyde and Compression on Mechanical Properties of Paulownia (P.fortunie) Wood. Iranian Journal of Wood and Paper Industries, 3 (1): 13-27.
[13] Fallah_Moghadam-Behambari, P., Mohebby, B. and Sharifnia-Dizboni, H., 2015. Influences of Combined-Hydro-Thermo-Mechanical (CHTM) Modification on Moisture Absorption and Dimensional Stability of Poplar Wood. Forest and Wood Products, 68 (1): 181-193.
[14] Ghorbani, M., Nikkhah Shahmirzadi, A. and Toopa, A., 2020. Effect of densification on the practical properties of chemical and thermal modified poplar wood. Iranian journal of wood and paper industries, 11 (2): 185-197.
[15] Shoja, M., Dastoorian, F., Ghorbani, M. and Zabihzadeh, S.M., 2020. Effect of alkaline pretreatment and surface impregnation on the set recovery of densified poplar wood. Iranian journal of wood and paper industries, 11 (3): 345-354.
[16] Najafi, A., Nasiri Tamaskani, H. and Soltani, M., 2012. A comparative study on the mechanical behavior of dowel joint made from hornbeam and compressed wood of paulownia and populus dowels. Journal of sciences and techniques in natural resources, 6 (4): 78- 172
[17] Eckelman, C.A., 2003. Textbook of product engineering and strength design of furniture. Purdue University, West Lafayette, Indiana: 65-67.
[18] Srivaro, S., Lim, H., Li, M., Jantawee, S. and Tomad, J., 2021. Effect of compression ratio and original wood density on pressing characteristics and physical and mechanical properties of thermally compressed coconut wood. Construction and Building Materials, 299: 124272.
[19] Cencin, A., Zanetti, M., Urso, T. and Crivellaro, A., 2021. Effects of an innovative densification process on mechanical and physical properties of beech and Norway spruce veneers. Journal of Wood Science, 67 (1): 1-14.
[20] Ulker, O., Imirzi, O. and Burdurlu, E., 2012. The effect of densification temperature on some physical and mechanical properties of Scots pine (Pinus sylvestris L.). BioResources, 7 (4): 5581-5592.