European Wood NDT & NDE Research and Practical Applications
Year 2014,
Volume: 2 Issue: 1, 35 - 43, 06.03.2014
Türker Dündar
,
Ferenc Divos
Abstract
The pioneering studies on non-destructive testing (NDT) and evaluation (NDE) of wood have been introduced in early 20th century in Europe as it is in North America. Several improvements were recorded since then in NDT&NDE technologies with parallel to the development in wood industry. A wide range of NDT technologies are currently being used successfully for evaluating wood and wood based materials in many areas from the inspection of artifacts to on-line production control in plants all over the world. Today, research and technology transfer efforts are underway throughout the world to further the development and use of nondestructive methods to address the many challenges that arise with using forest resources. This study aims to review the NDT/NDE research efforts and their practical applications being conducted in Europe that is significant contributors to the international research and development activities.
References
- Anthony, R. W., Phillips, G. E. (1992). Process control of finger joint strength using acousto- ultrasonics. In: Proceedings, Eighth International Symposium on Nondestructive Testing of Wood. Vancouver, WA, pp45-56.
- Beall, F.C. (1987). Acousto-ultrasonic monitoring of glueline curing. Wood and Fiber Science, 19(2), 204-214.
- Beall, F. C. (1989). Monitoring of in-situ curing of various wood-bonding adhesives using acousto- ultrasonic transmission. International Journal of Adhesion and Adhesives, 9(1), 21-25.
- Beall, F.C. (2002). Overview of the use of ultrasonic technologies in research on wood properties. Wood Science and Technology, 36, 197–212.
- Beall, F.C. (2007). Industrial applications and opportunities for nondestructive evaluation of structural wood members. Maderas. Ciencia y Tecnología, 9(2), 127-134.
- Beall, F.C., Biernacki, J. M. (1992). An approach to the evaluation of glulam beams through acousto- ultrasonics. In: Proceedings Eighth International Symposium on Nondestructive Testing of Wood, Vancouver, WA, pp. 73-88.
- Beall, F.C., Biernacki, J. M. (1994). Detection of adhesion flaws in parallel laminates of lumber using acousto-ultrasonics. In: Proceedings, Adhesives and Bonded Wood Symposium, Seattle, WA, pp 121-130.
- Becker, H.F. (1982). Schallemissionen während der Holztrocknung. Holz Als Roh Werkstoff, 40(9), 345−350.
- Bell, E.R., Peck, E.C., Krueger, N.T. (1950). Young’s Modulus of Wood Determined by a Dynamic Method. Rep. 1775. Madison, WI. USDA Forest Service, Forest Products Laboratory.
- Biernacki, J. M., Beall, F.C. (1993). Development of an acousto-ultrasonic scanning system for NDE of wood and wood laminates. Wood and Fiber Science, 25(3), 289-297.
- Biernacki, J. M., Beall, F. C. (1996a). Acoustic monitoring of cold-setting adhesive curing in wood laminates: effect of clamping pressure and detection of defective bonds. Wood and Fiber Science, 28(1), 7-14.
- Biernacki, J. M., Beall, F.C. (1996b). Acoustic monitoring of cold-setting adhesive curing in wood laminates. International Journal of Adhesion and Adhesives, 16(3), 165-172.
- Bo, K., Ronald W.A. (2004). Advances in in situ evaluation of timber structures. Progress in Structural Engineering and Materials, 6(2), 94–103.
- Bobadilla, I., Íñiguez, G., Esteban, M., Arriaga, F. (2007). Density estimation by screw withdrawal resistance and probing in structural sawn coniferous timber. In: Proceedings 15th International Symposium on NDT of Wood.
- Bodig, J. (2000). The Process of NDE Research for Wood and Wood Composites. In: Proceedings, 12th International Symposium on Nondestructive Testing of Wood, University of Western Hungary, Sopron, Hungary.
- Brashaw, B.K., Bucur, V., Divos, F., Gonçalves, R., Lu, J., Meder, R., Pellerin, R.F., Potter, S., Ross, R.J., Wang, X., Yin, Y. (2009). Nondestructive Testing and Evaluation of Wood: A Worldwide Research Update. Forest Products Journal, 59(3), 7-14.
- Bucur, V. (2003). Nondestructive Characterization and Imaging of Wood. Springer, Berlin Heidelberg New York.
- Bucur, V. (2006). Acoustic of Wood. Springer-Verlag Berlin Heidelberg New York.
- Elvery, R.H., Nwokoye, D.N. (1970). Strength assessment of timber for glued laminated beams. In: Proceedings Symposium on Nondestructive Testing of Concrete and Timber, Institute of Civil Engineering, London, and the British Commission for NDT, pp 105−110.
- Divos, F. (2000). Stress wave based tomography for tree evaluation. In: Proceedings of the 12th International symposium on nondestructive testing of wood.
- EN 519, (1995). Structural timber-grading-requirements for machine strength graded timber and grading machines. European Standard.
- EN 14081, (2005). Timber structures- strength graded structural timber with rectangular cross section. European Standard.
- Esteban, M., Arriaga, F., Íñiguez, G., Argüelles, R., Bobadilla, I. (2007). Estimation of the strength of coniferous timber using ultrasonic wave velocity, screw withdrawal resistance and penetration depth. In: Proceedings 15th International Symposium on NDT of Wood.
- Falk, R. H., Patton-Mallory, M., McDonald, K. A. (1990). Nondestructive Testing of Wood Products and Structures: State-of-the-Art and Research Needs. In: Proceedings Nondestructive testing and evaluation for manufacturing and construction, Champaign, IL. New York: Hemisphere Publishing Corp.,pp. 137-147.
- Fukada, E., Yasuda, S., Kohara, J., Okamoto, H. (1956). Dynamic Young’s modulus and piezoelectric constants of old timber. Bull Kabayasi Institute of Physics Research, 6, 104-107.
- Galligan, W.L., McDonald, K.A. (2000). Machine grading of lumber: practical concerns for lumber producers. Gen. Tech. Rep. FPL-GTR-7, USDA Forest Serv. Forest Products Laboratory, Madison, WI.
- Green, A. T. (1988). Qualification of particleboards on the mill line. In: Proceedings Nondestructive Testing and Evaluation for Manufacturing and Construction, H. L. M. dos Reis, Ed. Hemisphere Publishing Co., NY. pp149-160.
- Grönlund, A., Grundberg, S., Grönlund, U. (1994). The Swedish stem bank-an unique database for different silvicultural and wood properties. In: Proceedings IUFRO S5.01-04 Workshop, Hook, Sweden, pp. 71-77.
- Hanhijärvi, A., Ranta-Maunus, A. (2008). Development of strength grading of timber using combined measurement techniques. Report of the Combigrade-project – Phase 2.
- Hearmon, R.F.S. (1948). The elasticity of wood and plywood. Dept. Sci. Ind. Res. For. Prod. Res. Spec. Report No 7, HMSO, London.
- Hörig, H. (1935). Theory of elasticity of anisotropic solids applied to wood. Ing Arch VI, 8-14.
- Jayne, B.A. (1955). A nondestructive test of glue bond quality. Forest Products Journal, 5(5), 294-301.
- Íñiguez G., Esteban M., Gil, M.C., Arriaga, F. (2007). The influence of specimen length on ultrasound wave velocity. In: Proceedings of 15th International Symposium on NDT of Wood.
- Karsulovic, J. T., Leon, L.A., Dinator, M. I. (1999). The use of linear attenuation coefficients of gamma radiation for detecting knots in pinus radiata. Forest Products Journal, 49(2), 73-76.
- Kasal, B., Drdácký, M., Jirovský, I. (2003). Semi-destructive methods for evaluation of timber structures. In: Proceedings STREMAH VIII , Vol. 15 : 835-842, WIT Press.
- King, R. J., Basuel, J. C. (1992). Measurement of basis weight and moisture content of composite boards using microwaves. In: Proceedings Eighth International Symposium on Nondestructive Testing of Wood, Vancouver, WA, pp21-32.
- Kitayama, S., Noguchi, M., Satoyoshi, K. (1985). Automatic control system of drying Zekova wood by acoustic emission monitoring. Acoustic Letters, 9(4), 45−48.
- Kliger, I.R., Perstorper, M., Johansson, G., Pellicane, P.J. (1995). Quality of timber products from Norway spruce. Part 3. Influence of spatial position and growth characteritics on bending stiffness and strength. Wood Science and Technology, 29, 397-410.
- Kollmann, F. (1951). Technology of wood and wood based composites. Springer, Berlin Heidelberg New York.
- Laufenberg, T. L. (1986). Using gamma radiation to measure density gradients in reconstituted wood products. Forest Products Journal, 36(2), 59-62.
- Marchetti, B., Munaretto, R., Revel, G.M., Tomasini, E.P. (..). Non-contact ultrasonic sensor for density measurement and defect detection on wood. In: Proceeding of world conference on non-destructive testing, Montreal, Canadá.
- Noguchi, M., Kitayama, S., Satoyoshi, K., Umetsu, J. (1987). Feedback control for drying Zelkova ser- rata using in-process acoustic emission monitoring. Forest Products Journal, 37(1), 28−34.
- Olson, J. R., Arganbright, D. G. (1981). Prediction of mass attenuation coefficients of wood. Wood Science, 14(2), 86-90.
- Pellerin, R.F. (1965). Vibrational approach to nondestructive testing of structural lumber. Forest Products Journal, 15(3), 93-101.
- Pellerin, R.F., Ross, R.J. (2002). Nondestructive evaluation of wood. Forest Products Society, Pub. No. 7250, ISBN 1-892529-26-2.
- Reis, H. L. M., McFarland, D. M. (1986). On the acousto-ultrasonic characterization of wood fiber hardboard. Journal of Acoustic Emission, 5(2), 67-70.
- Reis, H.L.M., Beall, F.C., Carnahan, J.V., Chica, M.J., Miller, K.A., Klick, V.M. (1990a). Nondestructive evaluation/characterization of adhesive bonded connections in wood structures. In: Proceedings Nondestructive Testing and Evaluation for Manufacturing and Construction, H. L. M. dos Reis, Ed. Hemisphere Publishing Co., NY. pp. 197-207.
- Reis, H.L.M., Beall, F.C., Chica, M.J., Caster, D.W. (1990b). Nondestructive evaluation of adhesive bond strength of finger joints in structural lumber using the acousto-ultrasonic approach. Journal of Acoustic Emission, 9(3), 196-202.
- Resch, H. (2005). NDT-an original challenge to wood technology. In: Proceedings of the 14th International Symposium on Nondestructive Testing of Wood, Hanover, Germany. pp. 3-7.
- Resch, H. (2008). Considering changes in wood utilization -a European perspective. Maderas. Ciencia y tecnología, 10(1), 61-68.
- Rinn, F. (1996). Nondestructive inspection of building timber with resistograph micro drillings. In: Proceedings 10th International symposium on nondestructive testing of wood.
- Rinn, F. (2003). Technische Grundlagen der Impuls-Tomographie. Baumzeitung, 8, 29-31.
- Ross, R.J. (1984). Stress wave speed and attenuation as predictors of the tensile and flexural properties of wood based particle composites. [Ph.D. dissertation] Washington State University, Pullman, WA, USA.
- Ross, R.J., Pellerin, R.F. (1988). NDE of wood based composites with longitudinal stress waves. Forest Products Journal, 38(5), 39-45.
- Ross, R.J., Wang, X. (2012). Nondestructive testing and evaluation of wood: 50 years of research. Gen. Tech. Rep. FPL-GTR-213, USDA Forest Serv. Forest Products Laboratory, Madison, WI.
- Roux, J., Amede, P.E., Duchier, H.R. (1980). Dispositif ultrasonore d’aquisition de paramètres méca- niques de panneaux de particules et application au controle continu non destructif. Brevet Fr, 80, 18231.
- Sandoz, J.L. (1989). Grading of Construction Timber by Ultrasound. Wood Science and Technology, 23, 95-108.
- Rust, S. (2000). A new tomographic device for the nondestructive testing of trees. In: Proceedings 12th International symposium on nondestructive testing of wood.
- Sandoz, J.L. (1991). Form and treatment effects on conical roundwood tested in bending. Wood Science and Technology, 25, 203−214.
- Sandoz, J.L. (1994). Valorization of forest products as building materials using nondestructive testing. In: Proceedings 9th International Symposium on Nondestructive Testing of Wood, Madison, WI, pp 103−109.
- Sato, K., Suzuki, Y., Matsuo, H., Murase, S. (1995). Development of plywood grader using acoustic emission technique. Patent for plywood grader AELC. Yuasa Trading Co, Tokyo.
- Shearer, D.M., Beetham, R.C., Beall, F.C. (1988). Bond strength measurement of composite panel products. Patent No. 4,750,368. 7 pp.
- Steiger, R. (1991). Festigkeitssortierung von Kantholz mittels Ultraschall. Holz Zentralbl, 117(59), 985−989.
- Wessolly, L., Erb, M., Detter, A. (2012). Tree safety evaluation by pulling test and wind load analysis. In: Proceedings 7th Plant Biomechanics International Conference.
- Winistorfer, P. M., Davis, W. C., Moschler, W. W. (1986). A direct scanning densitometer to measure density profiles in wood composite products. Forest Products Journal, 36(11/12), 82-86.
EUROPEAN WOOD NDT&NDE RESEARCH AND PRACTICAL APPLICATIONS
Year 2014,
Volume: 2 Issue: 1, 35 - 43, 06.03.2014
Türker Dündar
,
Ferenc Divos
Abstract
Avrupa’da ahşabın tahribatsız test ve muayenesi alanındaki öncü araştırmalar, Kuzey Amerika’da olduğu gibi 20. yy. başlarında görülmeye başlanmıştır. İlerleyen yıllarda odun işleyen endüstrilerdeki gelişmelere paralel olarak tahribatsız test ve muayene alanında birçok önemli gelişmeler kaydedilmiştir. Günümüzde ahşap ve ahşap esaslı malzemelerin değerlendirilmesinde çok sayıda tahribatsız test teknolojisi, arkeolojik eserlerin incelenmesinden fabrikalarda üretimin on-line kontrolüne kadar oldukça geniş bir yelpazede başarılı bir şekilde kullanım alanı bulmaktadır. Bugün orman kaynaklarının kullanımındaki artıştan kaynaklanan birtakım problemlerin üstesinden gelmek için tahribatsız muayene yöntemlerinin geliştirilmesi ve kullanılmasının sağlanması amacıyla bu alanda yapılan araştırmalar ve teknolojik ilerlemeler bütün dünya ölçeğinde paylaşılmaktadır. Bu çalışmada ağaç malzemenin tahribatsız muayene ve değerlendirilmesi alanında Avrupa’da yapılan çalışmalar gözden geçirilmiş ve bu çalışmaların pratik uygulamaları hakkında bilgiler verilmeye çalışılmıştır.
References
- Anthony, R. W., Phillips, G. E. (1992). Process control of finger joint strength using acousto- ultrasonics. In: Proceedings, Eighth International Symposium on Nondestructive Testing of Wood. Vancouver, WA, pp45-56.
- Beall, F.C. (1987). Acousto-ultrasonic monitoring of glueline curing. Wood and Fiber Science, 19(2), 204-214.
- Beall, F. C. (1989). Monitoring of in-situ curing of various wood-bonding adhesives using acousto- ultrasonic transmission. International Journal of Adhesion and Adhesives, 9(1), 21-25.
- Beall, F.C. (2002). Overview of the use of ultrasonic technologies in research on wood properties. Wood Science and Technology, 36, 197–212.
- Beall, F.C. (2007). Industrial applications and opportunities for nondestructive evaluation of structural wood members. Maderas. Ciencia y Tecnología, 9(2), 127-134.
- Beall, F.C., Biernacki, J. M. (1992). An approach to the evaluation of glulam beams through acousto- ultrasonics. In: Proceedings Eighth International Symposium on Nondestructive Testing of Wood, Vancouver, WA, pp. 73-88.
- Beall, F.C., Biernacki, J. M. (1994). Detection of adhesion flaws in parallel laminates of lumber using acousto-ultrasonics. In: Proceedings, Adhesives and Bonded Wood Symposium, Seattle, WA, pp 121-130.
- Becker, H.F. (1982). Schallemissionen während der Holztrocknung. Holz Als Roh Werkstoff, 40(9), 345−350.
- Bell, E.R., Peck, E.C., Krueger, N.T. (1950). Young’s Modulus of Wood Determined by a Dynamic Method. Rep. 1775. Madison, WI. USDA Forest Service, Forest Products Laboratory.
- Biernacki, J. M., Beall, F.C. (1993). Development of an acousto-ultrasonic scanning system for NDE of wood and wood laminates. Wood and Fiber Science, 25(3), 289-297.
- Biernacki, J. M., Beall, F. C. (1996a). Acoustic monitoring of cold-setting adhesive curing in wood laminates: effect of clamping pressure and detection of defective bonds. Wood and Fiber Science, 28(1), 7-14.
- Biernacki, J. M., Beall, F.C. (1996b). Acoustic monitoring of cold-setting adhesive curing in wood laminates. International Journal of Adhesion and Adhesives, 16(3), 165-172.
- Bo, K., Ronald W.A. (2004). Advances in in situ evaluation of timber structures. Progress in Structural Engineering and Materials, 6(2), 94–103.
- Bobadilla, I., Íñiguez, G., Esteban, M., Arriaga, F. (2007). Density estimation by screw withdrawal resistance and probing in structural sawn coniferous timber. In: Proceedings 15th International Symposium on NDT of Wood.
- Bodig, J. (2000). The Process of NDE Research for Wood and Wood Composites. In: Proceedings, 12th International Symposium on Nondestructive Testing of Wood, University of Western Hungary, Sopron, Hungary.
- Brashaw, B.K., Bucur, V., Divos, F., Gonçalves, R., Lu, J., Meder, R., Pellerin, R.F., Potter, S., Ross, R.J., Wang, X., Yin, Y. (2009). Nondestructive Testing and Evaluation of Wood: A Worldwide Research Update. Forest Products Journal, 59(3), 7-14.
- Bucur, V. (2003). Nondestructive Characterization and Imaging of Wood. Springer, Berlin Heidelberg New York.
- Bucur, V. (2006). Acoustic of Wood. Springer-Verlag Berlin Heidelberg New York.
- Elvery, R.H., Nwokoye, D.N. (1970). Strength assessment of timber for glued laminated beams. In: Proceedings Symposium on Nondestructive Testing of Concrete and Timber, Institute of Civil Engineering, London, and the British Commission for NDT, pp 105−110.
- Divos, F. (2000). Stress wave based tomography for tree evaluation. In: Proceedings of the 12th International symposium on nondestructive testing of wood.
- EN 519, (1995). Structural timber-grading-requirements for machine strength graded timber and grading machines. European Standard.
- EN 14081, (2005). Timber structures- strength graded structural timber with rectangular cross section. European Standard.
- Esteban, M., Arriaga, F., Íñiguez, G., Argüelles, R., Bobadilla, I. (2007). Estimation of the strength of coniferous timber using ultrasonic wave velocity, screw withdrawal resistance and penetration depth. In: Proceedings 15th International Symposium on NDT of Wood.
- Falk, R. H., Patton-Mallory, M., McDonald, K. A. (1990). Nondestructive Testing of Wood Products and Structures: State-of-the-Art and Research Needs. In: Proceedings Nondestructive testing and evaluation for manufacturing and construction, Champaign, IL. New York: Hemisphere Publishing Corp.,pp. 137-147.
- Fukada, E., Yasuda, S., Kohara, J., Okamoto, H. (1956). Dynamic Young’s modulus and piezoelectric constants of old timber. Bull Kabayasi Institute of Physics Research, 6, 104-107.
- Galligan, W.L., McDonald, K.A. (2000). Machine grading of lumber: practical concerns for lumber producers. Gen. Tech. Rep. FPL-GTR-7, USDA Forest Serv. Forest Products Laboratory, Madison, WI.
- Green, A. T. (1988). Qualification of particleboards on the mill line. In: Proceedings Nondestructive Testing and Evaluation for Manufacturing and Construction, H. L. M. dos Reis, Ed. Hemisphere Publishing Co., NY. pp149-160.
- Grönlund, A., Grundberg, S., Grönlund, U. (1994). The Swedish stem bank-an unique database for different silvicultural and wood properties. In: Proceedings IUFRO S5.01-04 Workshop, Hook, Sweden, pp. 71-77.
- Hanhijärvi, A., Ranta-Maunus, A. (2008). Development of strength grading of timber using combined measurement techniques. Report of the Combigrade-project – Phase 2.
- Hearmon, R.F.S. (1948). The elasticity of wood and plywood. Dept. Sci. Ind. Res. For. Prod. Res. Spec. Report No 7, HMSO, London.
- Hörig, H. (1935). Theory of elasticity of anisotropic solids applied to wood. Ing Arch VI, 8-14.
- Jayne, B.A. (1955). A nondestructive test of glue bond quality. Forest Products Journal, 5(5), 294-301.
- Íñiguez G., Esteban M., Gil, M.C., Arriaga, F. (2007). The influence of specimen length on ultrasound wave velocity. In: Proceedings of 15th International Symposium on NDT of Wood.
- Karsulovic, J. T., Leon, L.A., Dinator, M. I. (1999). The use of linear attenuation coefficients of gamma radiation for detecting knots in pinus radiata. Forest Products Journal, 49(2), 73-76.
- Kasal, B., Drdácký, M., Jirovský, I. (2003). Semi-destructive methods for evaluation of timber structures. In: Proceedings STREMAH VIII , Vol. 15 : 835-842, WIT Press.
- King, R. J., Basuel, J. C. (1992). Measurement of basis weight and moisture content of composite boards using microwaves. In: Proceedings Eighth International Symposium on Nondestructive Testing of Wood, Vancouver, WA, pp21-32.
- Kitayama, S., Noguchi, M., Satoyoshi, K. (1985). Automatic control system of drying Zekova wood by acoustic emission monitoring. Acoustic Letters, 9(4), 45−48.
- Kliger, I.R., Perstorper, M., Johansson, G., Pellicane, P.J. (1995). Quality of timber products from Norway spruce. Part 3. Influence of spatial position and growth characteritics on bending stiffness and strength. Wood Science and Technology, 29, 397-410.
- Kollmann, F. (1951). Technology of wood and wood based composites. Springer, Berlin Heidelberg New York.
- Laufenberg, T. L. (1986). Using gamma radiation to measure density gradients in reconstituted wood products. Forest Products Journal, 36(2), 59-62.
- Marchetti, B., Munaretto, R., Revel, G.M., Tomasini, E.P. (..). Non-contact ultrasonic sensor for density measurement and defect detection on wood. In: Proceeding of world conference on non-destructive testing, Montreal, Canadá.
- Noguchi, M., Kitayama, S., Satoyoshi, K., Umetsu, J. (1987). Feedback control for drying Zelkova ser- rata using in-process acoustic emission monitoring. Forest Products Journal, 37(1), 28−34.
- Olson, J. R., Arganbright, D. G. (1981). Prediction of mass attenuation coefficients of wood. Wood Science, 14(2), 86-90.
- Pellerin, R.F. (1965). Vibrational approach to nondestructive testing of structural lumber. Forest Products Journal, 15(3), 93-101.
- Pellerin, R.F., Ross, R.J. (2002). Nondestructive evaluation of wood. Forest Products Society, Pub. No. 7250, ISBN 1-892529-26-2.
- Reis, H. L. M., McFarland, D. M. (1986). On the acousto-ultrasonic characterization of wood fiber hardboard. Journal of Acoustic Emission, 5(2), 67-70.
- Reis, H.L.M., Beall, F.C., Carnahan, J.V., Chica, M.J., Miller, K.A., Klick, V.M. (1990a). Nondestructive evaluation/characterization of adhesive bonded connections in wood structures. In: Proceedings Nondestructive Testing and Evaluation for Manufacturing and Construction, H. L. M. dos Reis, Ed. Hemisphere Publishing Co., NY. pp. 197-207.
- Reis, H.L.M., Beall, F.C., Chica, M.J., Caster, D.W. (1990b). Nondestructive evaluation of adhesive bond strength of finger joints in structural lumber using the acousto-ultrasonic approach. Journal of Acoustic Emission, 9(3), 196-202.
- Resch, H. (2005). NDT-an original challenge to wood technology. In: Proceedings of the 14th International Symposium on Nondestructive Testing of Wood, Hanover, Germany. pp. 3-7.
- Resch, H. (2008). Considering changes in wood utilization -a European perspective. Maderas. Ciencia y tecnología, 10(1), 61-68.
- Rinn, F. (1996). Nondestructive inspection of building timber with resistograph micro drillings. In: Proceedings 10th International symposium on nondestructive testing of wood.
- Rinn, F. (2003). Technische Grundlagen der Impuls-Tomographie. Baumzeitung, 8, 29-31.
- Ross, R.J. (1984). Stress wave speed and attenuation as predictors of the tensile and flexural properties of wood based particle composites. [Ph.D. dissertation] Washington State University, Pullman, WA, USA.
- Ross, R.J., Pellerin, R.F. (1988). NDE of wood based composites with longitudinal stress waves. Forest Products Journal, 38(5), 39-45.
- Ross, R.J., Wang, X. (2012). Nondestructive testing and evaluation of wood: 50 years of research. Gen. Tech. Rep. FPL-GTR-213, USDA Forest Serv. Forest Products Laboratory, Madison, WI.
- Roux, J., Amede, P.E., Duchier, H.R. (1980). Dispositif ultrasonore d’aquisition de paramètres méca- niques de panneaux de particules et application au controle continu non destructif. Brevet Fr, 80, 18231.
- Sandoz, J.L. (1989). Grading of Construction Timber by Ultrasound. Wood Science and Technology, 23, 95-108.
- Rust, S. (2000). A new tomographic device for the nondestructive testing of trees. In: Proceedings 12th International symposium on nondestructive testing of wood.
- Sandoz, J.L. (1991). Form and treatment effects on conical roundwood tested in bending. Wood Science and Technology, 25, 203−214.
- Sandoz, J.L. (1994). Valorization of forest products as building materials using nondestructive testing. In: Proceedings 9th International Symposium on Nondestructive Testing of Wood, Madison, WI, pp 103−109.
- Sato, K., Suzuki, Y., Matsuo, H., Murase, S. (1995). Development of plywood grader using acoustic emission technique. Patent for plywood grader AELC. Yuasa Trading Co, Tokyo.
- Shearer, D.M., Beetham, R.C., Beall, F.C. (1988). Bond strength measurement of composite panel products. Patent No. 4,750,368. 7 pp.
- Steiger, R. (1991). Festigkeitssortierung von Kantholz mittels Ultraschall. Holz Zentralbl, 117(59), 985−989.
- Wessolly, L., Erb, M., Detter, A. (2012). Tree safety evaluation by pulling test and wind load analysis. In: Proceedings 7th Plant Biomechanics International Conference.
- Winistorfer, P. M., Davis, W. C., Moschler, W. W. (1986). A direct scanning densitometer to measure density profiles in wood composite products. Forest Products Journal, 36(11/12), 82-86.