Standard Test Method for Measuring Shear Properties of Structural Adhesives by the Modified-Rail Test

Importancia y uso:

5.1 Structural design based on strength of materials principles or the theory of elasticity requires knowledge of the mechanical properties of the structural components, including adhesives. By the nature of their use, the most important adhesive properties are shear modulus and shear strength. A torsion test, such as described in Test Method E229, is theoretically the most accurate method for measuring adhesive shear properties. It is, however, impractical in many situations. For example, certain materials of construction are not readily adaptable to fabricating the thin-walled cylinders used as adherends in the torsion test. The modified-rail test does not have this disadvantage.

5.2 Two undesirable conditions occur in the modified-rail test specimens that do not occur in butt-joined cylinders; nonuniform shear-stress distribution along the joint, and the addition of some undefined combination of tension and compression stresses to the shear stress at a given location in the joint. The modified-rail shear tool minimizes but does not eliminate these undesirable effects.

5.3 Shear modulus, strength, and other properties are measured by the modified-rail method.

Subcomité:

D14.70

Referida por:

D0907-15R23, D4896-01R24, D5574-94R21, D6465-99R24

Volúmen:

15.06

Número ICS:

83.180 (Adhesives)

Palabras clave:

modified rail; shear; shear modulus; shear strength; strain;