Effects of density profile of MDF on stiffness and strength of nailed joints |
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Authors: | Kei Sawata Tatsuya Shibusawa Kazuo Ohashi Javier Ramon Sotomayor Castellanos Yasunori Hatano |
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Institution: | (1) Graduate School of Agriculture, Hokkaido University, N9 W9, Kita-ku, Sapporo 060-8589, Japan;(2) Composite Products Laboratory, Department of Wood-Based Materials, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan;(3) Iwate Prefectural Forestry Technology Center, Iwate 028-3623, Japan;(4) Faculty of Engineering in Wood Technology, University Michoacana of San Nicolas de Hidalgo, C.P. 58228 Morelia, Michoacan, Mexico |
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Abstract: | Nail-head pull-through, lateral nail resistance, and single shear nailed joint tests were conducted on medium density fiberboard
(MDF) with different density profiles, and the relations between the results of these tests and the density profiles of MDF
were investigated. The maximum load of nail-head pull-through and the maximum load of nailed joints were little affected by
the density profile. However, the ultimate strength of lateral nail resistance, the stiffness, and the yield strength of nailed
joints were affected by the density profile of MDF and showed high values when the surface layer of the MDF had high density.
It is known that bending performance is also influenced by density profile. Therefore, the stiffness and the yield strength
of nailed joints were compared with the bending performance of MDF. The stiffness of nailed joints was positively correlated
with the modulus of elasticity (MOE); in the case of CN65 nails, the initial stiffness of joints changed little in response
to changes in MOE. The yield strength of nailed joints had a high positive correlation with the modulus of rupture (MOR).
The stiffness and the yield strength of nailed joints showed linear relationships with MOE and MOR, respectively. |
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Keywords: | Press closing speed Nail-head pull-through Lateral nail resistance Single shear joint Density profile |
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