Experimental and Computational Micro-Characterization Techniques in Wood Mechanics

Curriculum Vitae


Education/Professional Career

1991:

BSc. in Forestry from Iowa State Universityue

1994:

MSc. in Wood Science from Virginia Polytechnic Institute and State University

1999:

PhD. in Wood Science from Virginia Polytechnic Institute and State University

1999-2009:

Scientist in Wood Drying Group at New Zealand Forest Research Institute (Scion)

Others

1989:

Forest Products Society

1989:

Society of Wood Science and Technology

1989:

Xi Sigma Pi honorary forestry society, ISU

1994:

Center for Adhesive and Sealant Science, VPI & SU

2001:

Royal Society of New Zealand

2003:

Delegate to New Zealand Public Service Association (PSA)

2003:

European Society of Wood Mechanics

2008:

COST IE0601 Wood Science for the Conservation of Cultural Heritage

2008:

New Zealand Cycle Advocates Network

Research Projects (relevant to Action)

Mechano-sorptive and creep relationships for Radiata Pine in drying environments: Jointly supported by the New Zealand Government and Forest and Wood Products Australia, this project characterizes the influence of temperature, moisture level, moisture change and time on the tangential, radial and longitudinal mechanical properties of small clear specimens of radiata pine heartwood and sapwood. Strength and stiffness have been evaluated at moisture contents from 6% (oven-dry basis) to fibre saturation at temperatures from 20 to 150°C. Creep and Mechano-sorptive behaviour is currently being characterized across the same range of environments. 

Optimising Final Steam Conditioning: Jointly supported by the New Zealand Government and the New Zealand Solid Wood Initiative, the objective of this study is to improve current steaming methodology such that effective stress relief and suitable moisture content leveling are achieved with minimum time and energy input. The surface energy and sorption behaviour of small samples removed from the surface of kiln dried radiata pine boards will be characterized to evaluate the influence of chemical and conformational changes occurring during kiln drying, which impact the wetting behaviour during steam conditioning after drying. 

Selected Publications (relevant to Action)

Lenth, C.A. and R. Sargent. 2008. Wood material behaviour during drying: moisture dependent tensile stiffness and strength of radiata pine at 70-150°C. Drying Technology 26 (9) 1112-1117.

Lenth, C.A. and R. Sargent. 2005. Investigating the Influence of Moisture Content and Temperature on the Tensile Stiffness of Radiata Pine. Proceedings of the 3rd International Conference of the European Society of Wood Mechanics, September 2004. Villa Real, Portugal.

Lenth, C.A., Wolf, M. Reynolds and F. Kamke. 2005. The influence of treatment environment on the dynamic stiffness of compressed, thermally-modified radiata pine. International Academy of Wood Science, Concepcion, Chile, 14-17 November, 2005.

Lenth, C.A. and A.N. Haslett.  2003. Moisture uptake patters in pressure steaming of radiata pine.  Holz als Roh- und Werksoff, 61 (2003) 444-448.

Haslett, A.N., H. Pearson and C. Lenth. 2001. New pressure steaming process reduces twist and stress. Forest Research Wood Processing Newsletter, Issue No. 29, May 2001

Lenth. C.A. and F.A. Kamke.  2001. Equilibrium moisture content of wood in high temperature pressurized environments.  Wood and Fiber Science, 33(1):104-118.

Lenth. C.A. and F.A. Kamke.  2001. Moisture dependent softening behavior of wood. Wood and Fiber Science, 33(3):492-507.

Haslett, A.N., H. Pearson and C. Lenth. 2001. New pressure steaming process reduces twist and stress. Forest Research Wood Processing Newsletter, Issue No. 29, May 2001

Lenth, C.A., S. Pang and A.N. Haslett. 2000. Material behaviour of Pinus radiata in severe environments: Background, methodology and specialised equipment. Paper presented at Pacific Rim Bio-Based Composites Symposium, Canberra, Australia, December 10–13.