engleski

Gluing strength of wood measured with nonstandard pressure-shear method

This work is a contribution to development and improvement of the methods for testing of gluing strength of wood to shear, and in particular to interpretation of the test results obtained with alternative test method, related to the respective EN and ISO standards. The study was performed on six groups of the test- specimens obtained by changing the slope of the rings line to the joint in the cross section. The effect on gluing strength was calculated by statistical analysis. Fracture surface of the test-specimens i.e. changes at the starting points of fracture and fracture directions were analyzed. Phototensiometry of the object raster was applied to monitor distribution of the shifts i.e. surface deformities of the test-specimens most exposed to them. The assumed difference between the mentioned groups of test-specimens has been ascertained, and it proved that these forms of test-specimens can be used in testing of the gluing strength of wood.

glued joint; slope of rings line; gluing strength; fracture surface; deforming of test specimens

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