Relationship between log and lumber modulus of elasticity

Past nondestructive evaluation (NDE) research efforts have paved the way for the successful use of NDE for determining the quality of finished wood products. However, little effort has been expended on developing nonvisual NDE techniques for use in grading or sorting logs for internal soundness and...

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Bibliographic Details
Published in:Forest products journal 1997-02, Vol.47 (2), p.89-92
Main Authors: Ross, R.J, McDonald, K.A, Green, D.W, Schad, K.C
Format: Article
Language:English
Subjects:
Applied sciences
BOIS DEBITE
ELASTICIDAD
ELASTICITE
ELASTICITY
ENSAYO
Exact sciences and technology
Feasibility studies
Forest products industry
GRUME
LOGS
LONGITUDINAL STRESS WAVES
Lumber industry
MADERA ELABORADA
Measurement
Moisture content
NMR
NONDESTRUCTIVE TESTING
Nuclear magnetic resonance
Polymer industry, paints, wood
Process engineering
Product quality
Properties and testing
SAWNWOOD
Studies
TESTAGE
TESTING
Tomography
TROZAS
VIBRACIONES
VIBRATION
VIBRATIONAL PROPERTIES
Wood
Wood products
Wood. Paper. Non wovens
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Summary:Past nondestructive evaluation (NDE) research efforts have paved the way for the successful use of NDE for determining the quality of finished wood products. However, little effort has been expended on developing nonvisual NDE techniques for use in grading or sorting logs for internal soundness and structural quality. This paper describes the results of a study that addressed this problem. Longitudinal stress wave NDE techniques were used to evaluate the quality of 193 balsam fir and eastern spruce logs prior to processing into lumber. Longitudinal speed-of-stress wave transmission was used to determine the modulus of elasticity (MOE) for each log. The MOE of each piece of structural lumber cut from the logs was then determined using transverse vibration NDE techniques. A strong relationship was observed between the MOE of the logs and the lumber obtained from the logs
ISSN:0015-7473
2376-9637