This study evaluated effects of driving torques on screw direct withdrawal resistance (SDWR) from wood-based composites.
The results on the screw seating torques indicated that the face-grain orientation of each material type had the highest mean load. The face-grain orientation of OSB had the highest mean load of 11.1 lb.in., and the MDF had the lowest mean load of 7lb.in. For the screw stripping torques, the result showed the face-grain orientation of each material type had the highest mean load. The face-grain orientation of OSB had the highest load of 55.9 lb.in.
Effects of torque levels on SDWR, the results indicated that the SDWR was lower at the torque level closer to the seating and stripping torque levels in OSB, whereas the SDWR was only lower in the torque level closer to the stripping torque within MDF and PB. Face-grain orientations of the each wood material had the highest SDWR.
Key words: direct screw withdrawal resistance, driving torques, wood composite, pilot hole diameters and grain orientations, seating and stripping torques
|Commitee:||Jones, David P., Lu, QiQi, Martin, William V.|
|School:||Mississippi State University|
|School Location:||United States -- Mississippi|
|Source:||MAI 49/05M, Masters Abstracts International|
|Subjects:||Mechanics, Forestry, Mechanical engineering, Wood sciences|
|Keywords:||Direct screw withdrawal resistance, Screw driving torques, Seating torque, Stripping torque, Torque, Wood based composite|
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