Density estimation by screw withdrawal resistance and probing in structural sawn coniferous timber, and modulus of elasticity assessment
DOI:
https://doi.org/10.3989/ic.2007.v59.i506.513Keywords:
screw withdrawal, pilodyn density, penetration depth, non-destructive, woodAbstract
The results of probing 395 sawn pieces of Radiata pine (Pinus radiata D. Don), Scots pine (Pinus sylvestris L.) and Laricio pine (Pinus nigra Arn. ssp. salzmannii) from Spanish sources are presented. Specimens had a cross section from 150 x 200 mm, 150 x 250 mm, and 200 x 250 mm. The Screw Withdrawal Force Meter (SWFM) developed by the Wood NDT Laboratory of the University of Western Hungary, in Sopron, and the Pilodyn 6J Wood Tester by Proceq, are the items of equipment used to measure screw withdrawal force and penetration depth, respectively.
Based on our results, this paper concludes that for structural coniferous timber the density values estimated from probing measurements are reliable. There is a positive correlation between non-destructive parameters and density (a coefficient of determination r2 of 48.5% to 49.9% is obtained). The authors believe that it is possible to use probing with ultrasonic methods as a good combined nondestructive technique to improve the results of visual grading and modulus of elasticity assessment, at least as an additional parameter in structural sawn timber.
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