Determination of the elastic constants of thermally modified beech by ultrasound and static tests coupled with 3D digital image correlation

• The twelve elastic constants provide a basis for modelling of thermally treated beech. Higher values were generally obtained by ultrasound than static tests and DIC. No clear correlations among treatment intensities observed. Orthotropic symmetry the compliance parameters was largely satisfied. Elastic moduli more affected heat Poisson’s ratios. Fagus sylvatica L. (European beech) is one most widespread hardwood species growing in Europe, which currently undergoing in-depth research development engineering products to use its excellent mechanical properties. As natural durability low, investigated as means enhance biological durability, well dimensional stability. Reliable models with full material description including are necessary structural design. aim this work comprehensively characterise European beech subjected three different treatments. It described an orthotropic determining all independent constants: Young’s moduli, shear six Both (by compression) dynamic ultrasound) experimental methods considered comparison purposes. compression coupled 3D digital image correlation (DIC) technique perform optical full-field analyses strains. Characterization untreated also carried out compared literature values. usual assumption matrix verified. results confirmed that influenced behaviour material. However, impact differed components, non-uniform trends intensity