ASTM D1002 Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens

Scope:

The ASTM D1002 is a standard test method for apparent shear strength of single-lap-joint adhesively bonded metal specimens by tension loading (Metal-to-Metal). This is largely a  comparison test process. It can, however, be used as a discriminator to determine differences in adherend surface preparation conditions and adhesive environmental endurance. The test method has been used to determine the strength properties of tested systems by manipulating surface preparations, primers, and adhesive systems. This test can also be performed to compare and select adhesives or bonding methods for fatigue and environmental changes susceptibility.

Test Procedure :  

For the ASTM D1002, the specimens are put in the testing machine’s grips so that the outer 25  mm of each end is in contact with the jaws and the long axis of the test specimen coincides with the direction of applied pull through the grip assembly’s center line. After that, the specimen is loaded at a rate of 80 to 100 kg/cm² of shear area per minute. The load is continued till the specimen begins to fail. A free crosshead speed of 1.3 mm /min will be used to approximate this rate of loading.

Specimen Size :  

Single-lap-joint adhesively bonded metal specimens are used in the ASTM D1002 test procedure. 

Data :  

According to the ASTM D1002, each test specimen’s load at failure, as well as the nature and extent of the failure, is noted. All failure loads are determined to the closest 0.06 cm2 in kilograms per square centimeter of shear area.

Conclusion:

ASTM D1002 test method covers the determination of shear strength of adhesives suggesting desirable changes to enhance their quality and performance. The results aid in enhancing their quality keeping in view the global standards.