Development of a technique to determine the 3D elasticity tensor of wood as applied to drying stress modeling

Authors

  • Aziz Laghdir Laval University
  • Yves Fortin Laval University
  • Carmen Mariella De la Cruz FCBA
  • Roger E. Hernández Laval University

Keywords:

3D elasticity tensor of wood, semi-ring extensometer, 6-specimen technique, axial and transverse strain measurements, wood drying

Abstract

The objective of this study was to develop an accurate and simple method for measuring the engineering coefficients of the 3D elasticity tensor of wood. A method using a semi-ring extensometer (SRE) and a compression specimen (6-specimen technique) is proposed. The SRE is made of a semi-ring stainless steel blade pin-jointed to two aluminum fixing plates, and two resistance strain gauges bonded to the top and bottom faces of the blade at mid-span position. Groups of five matched compression specimens (20 mm x 20 mm x 60 mm) from black spruce wood (Picea mariana (Mill.) B.S.P.), cut in six different orientations with respect to load axis (three orthotropic directions and three diagonal directions at an angle of 45 degrees to the load axis) were used for the calibration of the SRE. A resistance strain gauge bonded directly to the wood surface was used as a reference for both the axial and transverse measurements. The validation of the technique was made with another series of specimens cut in the same six orientations. The axial strain data of the SRE were then compared to the ones obtained from a linear displacement sensor (LVDT). For the transverse directions, the SRE results in terms of Poisson’s ratios and shear moduli were compared with corresponding data obtained from the literature. Results showed that the R2 value of the relationship between the Young’s moduli determined with the SRE and the LVDT varied from 0.88 to 0.97. The SRE technique appeared also reliable to evaluate both the Poisson’s ratios and shear moduli as the obtained values were in good agreement with the literature data. As compared to bonded strain gauges, the SRE technique is reusable, simpler and cheaper to use and its sensitivity is nearly independent of temperature.

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Author Biographies

Aziz Laghdir, Laval University

Department of Wood and Forest Science, Laval University, Quebec (Qc), Canada, G1K 7P4.

Yves Fortin, Laval University

Department of Wood and Forest Science, Laval University, Quebec (Qc), Canada, G1K 7P4.

Carmen Mariella De la Cruz, FCBA

FCBA, 10 Avenue de Saint Mandé, 75012 Paris, France.

Roger E. Hernández, Laval University

Department of Wood and Forest Science, Laval University, Quebec (Qc), Canada, G1K 7P4.

How to Cite

Laghdir, A., Fortin, Y., De la Cruz, C. M., & Hernández, R. E. (2014). Development of a technique to determine the 3D elasticity tensor of wood as applied to drying stress modeling. Maderas. Ciencia Y Tecnología, 10(1), 35–44. Retrieved from https://revistas.ubiobio.cl/index.php/MCT/article/view/1403

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