ASTM D4027 – 98(2019) : Standard Test Method for Measuring Shear Properties of Structural Adhesives by the Modified-Rail Test
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 , 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.