Nondestructive Evaluation of 2 by 8 and 2 by 10 Southern Pine Dimensional Lumber

This study investigated the use of two nondestructive testing (NDT) methods to evaluate the mechanical properties of No. 2 grade: 2 by 8 and 2 by 10 southern pine lumber. The dynamic modulus of elasticity (dMOE) of each specimen was evaluated nondestructively by using longitudinal vibration and tran...

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Bibliographic Details
Published in:Forest products journal 2020-03, Vol.70 (1), p.79-87
Main Authors: Franca, Frederico Jose Nistal, Franca, Tamara Suely Filgueira Amorim, Seale, R. Daniel, Shmulsky, Rubin
Format: Article
Language:English
Subjects:
Biodegradable materials
Correlation
Forest products
Forest products industry
Lumber
Mechanical properties
Methods
Modulus of rupture
Moisture content
Nondestructive testing
Pine
Pines
Statistical analysis
Stiffness
Storage modulus
Testing
Timber
Transverse oscillation
Wood products
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Summary:This study investigated the use of two nondestructive testing (NDT) methods to evaluate the mechanical properties of No. 2 grade: 2 by 8 and 2 by 10 southern pine lumber. The dynamic modulus of elasticity (dMOE) of each specimen was evaluated nondestructively by using longitudinal vibration and transverse vibration in edgewise and flatwise directions. After the NDT evaluation, the specimens were destructively tested and correlations between static bending MOE with modulus of rupture (MOR) and dMOE were developed. The overall MOE values were 11.14 and 10.96 GPa for 2 by 8 and 2 by 10, respectively. For MOR, the overall value for 2 by 8 was 42.59 MPa, and for 2 by 10 was 43.05 MPa. As expected, results showed statistically significant correlations between static MOE and dMOE (with r ranging from 0.87 to 0.96 for both sizes tested). Also as expected, weaker correlations were found between MOR and the dMOE values (with r ranging from 0.42 to 0.57 for both sizes tested). The lower correlations are largely explained by the difference between the NDT tools analyzing each specimen's global stiffness versus MOR, which is influenced heavily by localized characteristics. Perhaps this finding occurred because larger strength-reducing characteristics are permitted in larger section pieces (2 by 8 vs. 2 by 10) and thus they have opportunity for greater variability. The continuation of studies to develop more reliable NDT is crucial to improve the evaluation of mechanical properties of southern pine lumber and is beneficial to the southern pine timber industry.
ISSN:0015-7473
2376-9637
DOI:10.13073/FPJ-D-19-00051