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- Title
Effect of wood density and screw length on the withdrawal resistance of tropical wood.
- Authors
Lopes RIBEIRO, Marina; DEL MENEZZI, Cláudio Henrique Soares; Luiz SIQUEIRA, Milton; de MELO, Rafael Rodolfo
- Abstract
In most timber connections a metallic pin is required due to lateral forces, but occasionally selftapping screws are required due to tensile stresses. The aim of this study was to experimentally determine the withdrawal resistance of self-tapping screws in tropical wood species by analyzing the influence of wood density and screw penetration length. For this, withdrawal resistance tests using hex lag screws of 12.7 mm diameter and different thread lengths were performed in specimens of the following species: Angelim (Dinizia excelsa), Freijó (Cordia goeldiana), Ipê (Tabebuia sp.), Louro-vermelho (Nectandra rubra), and Marupá (Simarouba amara). It was verified that the maximum load of screw withdrawal increases with increasing screw length inserted in wood and wood density. However, screw rupture may occur in denser species because the withdrawal load exceeds the screw strength limit. Therefore, lower screw lengths are recommended for denser woods.
- Subjects
WOOD density; SCREWS; TIMBER; ANDIRA; TENSILE strength
- Publication
Nativa, 2018, Vol 6, Issue 4, p402
- ISSN
2318-7670
- Publication type
Article
- DOI
10.31413/nativa.v6i4.5638