Near Infrared Spectroscopy as a Tool for Estimation of Mechanical Stresses in Wood

Abstract:

Significant scientific work has been dedicated for exploration of the infrared applications within wood science and technology, not much has been done linking it to the mechanical testing. It is expected that due to mechanical stresses (and related deformations) the interaction between constitutive elements of wood changes, proportionally to the stresses applied. The response of the material to mechanical stresses (such as tensile loading) on the molecular level should be therefore detectable by means of infrared spectroscopy. Dedicated tests have been devoted for proving this hypothesis. Self-developed testing machine has been integrated with infrared spectrometer in order to conduct a series fully controlled mechanical tests. It was possible to predict stress level of wood during tension by applying proper chemometric analysis (partial least square (PLS) models). Implementation of infrared spectroscopy in to timber engineering and mechanical testing of wood provides very essential supplement to the typical information collected during standard tests. More additional tests and reference data is necessary in order to create more reliable and universal model suitable for routine assessments. Nevertheless, it was demonstrated that prediction of the stress on the basis of the infrared spectra is possible.

• Periodical: Advanced Materials Research (Volume 778)
• Pages: 448-453
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.778.448
• Online since: September 2013
• Authors: Jakub Sandak, Anna Sandak, Dusan Pauliny, Victoria Krasnoshlyk, Olle Hagman
• Keywords: Chemometry, Ft-NIR, Mechanical Stresses, Tension, Wood

References

[1] G. Tampone, Mechanical Failures of the Timber Structural Systems From Material to Structure - Mechanical Behaviour and Failures of the Timber Structures, ICOMOS IWC - XVI International Symposium, Italy (2007).

[2] N. Lombardini, Assessment of Deformability and Collapse Load of Timber Structures Built According to Treatises of the First Half of Nineteenth Century: the Case of the Truss Structures on the Roof of the Town Hall in Ravenna, ICOMOS IWC - XVI International Symposium, Italy (2007).

[3] M. Zborowska, A. Sandak, J. Sandak, S. Borysiak, W. Pradzynski, Characterization of archaeological wood degradation with selected non-destructive methods, proceedings of International Conference: Wooden Cultural Heritage: Evaluation of Deterioration and Management of Change, (2009).

[4] S. Tsuchikawa, A Review of Recent Near Infrared Research for Wood and Paper, Applied Spectroscopy Reviews, 42 (2007) 43-71.

DOI: 10.1080/05704920601036707

[5] N. Gierlinger, M. Schwanninger, A. Reinecke, I. Burgert, Molecular changes during tensile deformation of single wood fibres followed by Raman microscopy, Biomacromolecules. 7 (2006) 2077–(2081).

DOI: 10.1021/bm060236g

[6] J. Sandak, A. Sandak, M. Negri, Mechanical testing of wood assisted by infrared spectroscopy and thermal imaging. 11th World Conference on Timber Engineering, Italy (2010).

[7] N. Andre, N. Labbe, TG. Rials, S.S. Kelley, Assessment of wood load condition by Near Infrared (NIR) spectroscopy, J Mater Sci, 41, 7 (2006) 1879–1886.

DOI: 10.1007/s10853-006-4433-6

[8] M. Schwanninger, J.C. Rodrigues, K. Fackler, A review of band assignments in near infrared spectra of wood and wood components, J Near Infrared Spec, 19, 5 (2011) 287-308.

DOI: 10.1255/jnirs.955