Mechanical performance of wood-based composites is determined by the mechanical properties of their individual components and the effective load transfer between these components. In laminated wood composites the adhesive bondline facilitates this load transfer and holds the laminates together. The bulk composite performance can be partially attributed to the bondline's own stiffness and bonding efficacy with the adherends. An understanding how the adhesive contributes mechanically to the bulk composite material will allow adhesive and composite manufacturers to better formulate and construct their products. The experimental methodology developed in this study allows recording and analysis of full-field deformation and strain distributions across loaded wood-adhesive interphases at a micro-mechanical level. Optical measurements based on digital image correlation (DIC) principles were taken using a stereomicroscopic camera system. This system allows us to observe in plane deformations as well as out of plane displacements, providing us with a full-field 3D surface strain map across the adhesive bond. These measurements can be used to improve the understanding of the load transfer between the adherends and serve as rich quantitative input for numerical modeling and simulations.
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