THE OPTIMAL DESIGN OF THE TESTING SPECIMENS FOR A MORE ACCURATE EVALUATION OF THE GLUES’ MECHANICAL PROPERTIES

Abstract

The main goal of the contribution consists in offering an improved method in the glues’ mechanical behaviours estimation, involving also a new type of specimen. The described method can be used successfully not only in the wood industry, but also in several other industrial applications, where the adhesives’ mechanical properties have to be determined as much as accurate possible. The authors elaborated the below-proposed method, based on their former, high-accuracy investigations by means of Holographic Interferometry, where were evaluated not only the timedependent behaviours of the glues (evaluated by means of their displacements field), but also their residual behaviours, too. The original testing bench of the authors allows a wide range of stresses, out of which, this paper describes only the longitudinal shear one. The proposed testing specimen, analysed by means of FEM method, will eliminate totally the undesired bending effect, which produces the so-called peel stress. The authors express their hope that the proposed strategy will became an useful, objective and high-efficiency modality both for testing and choosing the most adequate glue (not only for wood-industry, but also for the general industrial purpose, too).

Keywords

• glue
• mechanical properties
• complex testing bench
• new testing specimen
• Holographic Interferometry