On the identifiability of stiffness components of clear wood from a 3D off-axes prismatic specimen: angle orientation and friction effects

Published Date
May 2016, Volume 74, Issue 3, pp 285–290

Title 

On the identifiability of stiffness components of clear wood from a 3D off-axes prismatic specimen: angle orientation and friction effects

• Author 

• J. Xavier, 
• A. Majano-Majano, 
• J. Fernandez-Cabo

Original

First Online: 

18 March 2016

DOI: 10.1007/s00107-016-1032-3

Cite this article as: 

Xavier, J., Majano-Majano, A. & Fernandez-Cabo, J. Eur. J. Wood Prod. (2016) 74: 285. doi:10.1007/s00107-016-1032-3

Abstract

The robustness of the test method based on a single 3D off-axis prismatic specimen for the simultaneous identification of the orthotropic stiffness components of clear wood is addressed. In this method, the specimen is consecutively submitted to uniaxial compression tests along its three orthogonal axes. A data reduction based on anisotropic elasticity is applied to extract active material parameters from 3D full-field deformation measurements provided by stereo-correlation over adjacent faces. Two major limitations of this test method, directly affecting the parameter identification, are analysed and discussed: (1) off-axes angle orientation; (2) friction effects. A numerical study pointed out that radial and tangential rotations of about 29° and 9°, respectively, balances out the strain components in the specimen response. Moreover, friction can be reduced by using mass lubricant or soft material in the contact interface, realising transverse shear deformation.

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