Specifications for adhesives used for finger joints in non-structural lumber products

2015 ◽  
Keyword(s):  
Finger Joints ◽  
Structural Lumber

Comparison of NDE techniques for assessing mechanical properties of unjointed and finger-jointed lumber

Holzforschung ◽  
2011 ◽  
Vol 65 (3) ◽  
Author(s):  
Tobias Biechele ◽  
Ying Hei Chui ◽  
Meng Gong
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Black Spruce ◽  
Correlation Coefficients ◽  
Bending Stiffness ◽  
Strength Prediction ◽  
Finger Joints ◽  
Non Destructive Evaluation ◽  
Non Destructive ◽  
Structural Lumber

Abstract Non-destructive evaluation (NDE) methods are common for grading structural lumber with static bending as the traditional NDE method for strength. More recently, longitudinal and transverse vibration techniques have also been proposed for grading lumber. In this study, unjointed and finger-jointed sawn lumber has been evaluated by these traditional and relatively new NDE methods. In total, 188 pieces of 38 mm×89 mm black spruce lumber were tested. Of these, 40 were unjointed, 47 had 2–3 finger joints, and 101 had 5–7 finger joints. The main objective was to evaluate the reliability of the various NDE techniques in predicting the bending stiffness and tensile strength of finger-jointed lumber with different number of finger joints. Results show that all NDE methods provide stiffness values of unjointed and finger-jointed lumber that correlate well with laboratory measured static bending stiffness with R2 values ranging from 0.76 to 0.97. Moreover, lumber with finger joints has lower bending stiffness than unjointed lumber. Based on the correlation coefficients, there is no evidence that finger joints affect the precision of the strength prediction by NDE methods.

A Case of Eosinophilic Fasciitis with Contracture of the Finger Joints.

1999 ◽  
Vol 61 (2) ◽  
pp. 134-137
Author(s):  
Kiho KIYOI ◽  
Tamano MATSUI ◽  
Kiyofumi EGAWA ◽  
Tomomichi ONO
Keyword(s):  
Eosinophilic Fasciitis ◽  
Finger Joints

World's largest Sliding Finger Joints for the Audubon Bridge

2009 ◽  
Vol 96 (14) ◽  
pp. 63-72
Author(s):  
Thomas Spuler ◽  
Gianni Moor ◽  
Pascal Savioz
Keyword(s):  
Finger Joints

scholarly journals Non-Destructive Lumber and Engineered Pine Products Research in the Gulf South U.S. 2005–2020

Forests ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 91
Author(s):  
R. Dan Seale ◽  
Rubin Shmulsky ◽  
Frederico Jose Nistal Franca
Keyword(s):  
Agricultural Research ◽  
Forest Products ◽  
Wood Products ◽  
Time Interval ◽  
Mississippi State University ◽  
State University ◽  
White Oak ◽  
Department Of Agriculture ◽  
Mass Timber ◽  
Structural Lumber

This review primarily describes nondestructive evaluation (NDE) work at Mississippi State University during the 2005–2020 time interval. Overall, NDE is becoming increasingly important as a means of maximizing and optimizing the value (economic, engineering, utilitarian, etc.) of every tree that comes from the forest. For the most part, it focuses on southern pine structural lumber, but other species such as red pine, spruce, Douglas fir, red oak, and white oak and other products such as engineered composites, mass timber, non-structural lumber, and others are included where appropriate. Much of the work has been completed in conjunction with the U.S. Department of Agriculture, Forest Service, Forest Products Laboratory as well as the Agricultural Research Service with the overall intent of improving lumber and wood products standards and valuation. To increase the future impacts and adoption of this NDE-related work, wherever possible graduate students have contributed to the research. As such, a stream of trained professionals is a secondary output of these works though it is not specifically detailed herein.

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