Procedure and device for determining the fracture toughness in a test for forced introduction and advancement of a wedge through an adhesive bond (Machine-translation by Google Translate, not legally binding)

摘要

Procedure and device for determining the fracture toughness in a test for the forced introduction and advancement of a wedge through an adhesive bond. Method and device for determining the fracture toughness in a forced introduction and advancement test of a wedge (1) through an adhesive bond, called a test piece (2), comprising at least two materials (2a, 2b) adhered each other, where the procedure comprises the following stages: A) calculate a curve of a function, called curve FPUSH (δ), whose: - independent variable is the displacement, δ, longitudinal and in the direction of the crack (3), of the wedge (1), - and the dependent variable is the pushing force, FPUSH, necessary to carry out this displacement, δ; where said curve is calculated from the experimental measurement of the displacement, δ, and the pushing force, FPUSH; B) analytically determine the coefficient of friction, (μ), between the wedge (1) and the specimen (2) by means of a calculation and iterative adjustment of least squares of the curve FPUSH (δ) in the introduction phase of the introduction and forced advance test; y C) analytically determine the fracture toughness, GIC, from the coefficient of friction, μ, and the curve FPUSH (δ) in the phase of propagation of the introduction and forced advance test. (Machine-translation by Google Translate, not legally binding)