Related Links
Investigation the acoustic behavior of poplar and spruce species reaction wood using ultrasonic technique | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| Article 10, Volume 27, Issue 2 - Serial Number 39, June 2012, Pages 306-318 PDF (264.73 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwpr.2012.117069 | ||
| Authors | ||
| Mohammad ali Sadat nia* 1; Ali akbar Enayati2; Loeic Brancheriau3; Kambiz Pourtahmasi4; Farhang Honarparvar5 | ||
| 1Assistant Professor, Wood and Paper Sciences, Khatamoanbia University of Behbahan | ||
| 2Professor, Wood and Paper Sciences, Tehran University | ||
| 3Assistant Professor, Mechanics Sciences, Montpellier University | ||
| 4Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran | ||
| 5Assistant Professor, Wood and Paper Sciences, Tehran University | ||
| Abstract | ||
| The acoustic behavior of reaction and normal woods, phase velocity, group velocity and attenuation coefficients in the main directions for two wood species (Populus deltoids & Picea abies), were measured and compared. The results did not show any significant difference between phase velocities of normal and tension wood at the same ring in poplar wood. But in compression wood from spruce, phase velocity in longitudinal direction was lower; while in transverse direction was higher compared to normal wood. Group velocity as an index of speed of wave energy in compression wood also was less than that in normal wood. In radial and tangential directions, there was no significant difference between group velocity of compression and normal woods of spruce. In poplar species, in all main directions, the measured group velocities, both for tension and normal woods were identical. The result also showed that the attenuation coefficients in reaction wood of two wood species (poplar and spruce) were less than those of normal wood in all directions. In compression and tension woods, a high correlation was observed between acoustic radiation and wood density. | ||
| Keywords | ||
| tension wood; compression wood; acoustic behavior; phase velocity; attenuation coefficient | ||
| References | ||
|
-Badia M., Mothe F., Constant T., Nepveu G (2005) Assessment of tension wood detection based on shiny appearance for three poplar cultivars, Ann. For. Sci. 62: 43–49
-Barnnet j.R., Jeronimidis G (2003) Wood quality and its biological Basis, Blackwell scientific Publisher, oxford.
-Beal F (2002) Overview of the use of ultrasonic technologies in research on wood properties, Wood Science and Technology 36: 197-212
-Bucur V (2006) Acoustics of wood, Springer Series in Wood Science, 387p-
-Bucur V (2003a) Nondestructive characterization and imaging of wood, Springer Series in wood science, 354p
-Bucur V (2003b) Techniques for high resolution imaging of wood structure: a review, Meas. Sci. Technol.14:R91-R98
-Bucur V., Bohnke I (1994) Factors affecting ultrasonic measurements in solid wood, Ultrasonic, Volume32, 32 (5): 385-390
-Bucur V., Janin G., Herbe C., Ory JM (1991) Ultrasonic detection of reaction wood in European species. Proc 10th Congr Forestier Mondial, 17−26 Sept, Paris
-Carlquist S (1988) Comparative wood anatomy, Springer Series in Wood Science, 435 p
- CunderlikI., Kudela J., Molinski W (1992) Reaction beech wood in drying process. In: IUFRO drying conference, Vienna, pp 350–353
-Feeney F.E (1987) The adaptation of an ultrasonic pulse velocity technique for use on small samples of Sitka spruce for evaluation of structural wood quality. MSc Thesis, St Patrick College, Maynooth, Ireland
-Green D., Winandy J., kretschmann D (1999) Wood as an engineering material, Department of Agriculture, Forest Service, Forest Products Laboratory, 463 p.
-Hamm EA and Lam F (1989) Compression wood detection using ultrasonic’s. G Prove Nondestructive1:40-47
-Oliveira F and Sales A (2006) Relationship between density and ultrasonic velocity in Brazilian tropical woods, Bioresource Technology 97:2443-2446
- Pellerin R and Ross R (2002) Nondestructive evaluation of wood, forest products society Madison, 210p
- Rose, J.L (2004) Ultrasonic Waves in Solid Media, CambridgeUniversity press. Cambridge. UK. 454 p - Young-Fo C., Mitch M., Chih-Hsiung C (2006) Experimental measurements of the phase and group velocities of body waves in a transversely isotropic medium, NDT&E International 39 (2006) 162–168
| ||
|
Statistics Article View: 392 PDF Download: 283 |
||
Journal management system. designed by sinaweb