ASTM D2294 Creep Properties of Adhesives in Shear by Tension Loading

Scope:

When tested on a standard specimen and exposed to a specific temperature and tensile stress in a spring-loaded testing apparatus, the ASTM D2294 test technique covers the assessment of the creep properties of adhesives for bonding metals. This test method is valuable for comparing adhesive creep properties in research and development, especially when those qualities are impacted by changes in adhesive formulation or projected service circumstances, such as temperature, moisture level, and loading time.

Procedure:

In ASTM D2294 testing, the test apparatus is connected to a testing machine and set to a specific temperature. A specimen is placed in the load chamber of the test apparatus and pins are used to attach it to the chamber and load the shaft. The test machine is the one that applies the load. The testing machine is unloaded after reaching the desired load, and the entire creep test apparatus is taken from the testing machine and placed in the proper environment. 

A calibrated microscope with a 100X magnification is used to monitor the displacement of thin razor lines over both sides of the bond area to determine the total deflection. The total deflection, the amount and duration of the tensile stress, and the test temperature for each specimen are all recorded at repeated intervals during the ASTM D2294 test. 

Video 01: Working mechanism of a creep testing machine

Specimen size:

Tension lap-shear specimens are used in the ASTM D2294 test procedure. 

Data:

All loads are stated in kilograms per square centimeter (or pounds per square inch), and if possible, reported to three significant figures, according to ASTM D2294.

Conclusion:

When tested on a standard specimen and exposed to a specific temperature and tensile stress in a spring-loaded testing apparatus, the ASTM D2294 test technique covers the assessment of the creep properties of adhesives for bonding metals.