ASTM D 4027 (D-4027) determines the equipment and procedures to measure the shear modulus and shear strength of adhesive layers between rigid adherends. ASTM D4027 equipment may also be used for determining the adhesive’s shear creep compliance, the effects of strain history such as cyclic loading upon shear properties, and a failure criteria for biaxial stress conditions such as shear plus tension and shear plus compression.

Testing Procedure

Shear force is applied to the adhesive through the adherends by a modified-rail shear tool. The adherends are firmly clamped between two pairs of rigid rails. One pair is fixed and the other is movable. The rigid rails limit undesired adherend deformation during testing. The pair of movable rails is fixed to two counter-moment pivot arms. These arms restrict the attached rails (and clamped adherend) to collinear motion with respect to the fixed rails (and clamped adherend). The results of using this shear tool are nearly uniform stress and strain distributions and the reduction of normal stress in the adhesive layer under load. Such conditions are necessary for accurate measurement of the adhesive shear properties.

The universal testing machine meets the minimum load capacity of 8900 N (2000 lbf), and a range of crosshead speed from 0.317 to 10.16 mm/min (0.0125 to 0.40 in./min) By means of our testing expertise and modular product design, we will help find the solution that is right for you. Give our test engineers a call today for help configuring the best test machine and accessories according to your standard.

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