Study of Wood Plastic Composites elastic behaviour using full field measurements

¹ LETTM, Ecole Supérieure des Sciences et de Technologie de H-Sousse, rue Lamine ElAbbassi, 4011 H-Sousse, Tunisie
² Université de Toulouse; INSA, UPS, Mines Albi, ISAE ; ICA (Institut Clément Ader); Campus Jarlard, F-81013 Albi, France
³ Ecole des Mines Albi, Campus Jarlard, F-81013 Albi, France
⁴ Sylvadour, IUT des Pays de l’Adour, 371 rue du Ruisseau BP 201 40004 Mont-de-Marsan, France
⁵ Université de Limoges, ENSIL, 16 rue Atlantis, Parc ESTER Technopole, BP 6804, 87068 Limoges, France

^a e-mail: Laurent.Robert@mines-albi.fr

Abstract

In this study, the mechanical properties and microstructure of HDPE/wood fibre composites are investigated. The four-point bending and tensile behaviour of Wood Plastic Composite (WPC) with or without additive are studied by using full-field strain measurements by 3-D Digital Image Correlation (3-D DIC). A non-linear behaviour is shown. The modulus of elasticity (MOE) is calculated as the tangent at zero strain of a Maxwell-Bingham model fitted onto experimental data. Four-point bending tests are analyzed thanks to the spatial standard deviation of the longitudinal strain field to determine the degree of heterogeneity. Cyclic tensile tests have been performed in order to analyze the damage of the material. Moreover, Scanning Electron Microscope (SEM) is used to characterize the morphology of the wood fibre/HDPE matrix interface for specimens with maleic anhydride modified polyethylene additive (MAPE).