Scope:

The standard test method for Strain-Controlled Fatigue Test by ASTM E606 determines fatigue properties of nominally homogeneous materials. ASTM E606 is mainly performed in support of activities like materials research and development, mechanical design, process and quality control, product performance, and failure analysis. Strain-controlled fatigue can also be an important consideration in design of industrial products. This test is intended primarily for strain controlled fatigue testing but some sections may provide useful information for force-controlled or stress-controlled testing.

Test Procedure:

For ASTM E606, the sample is loaded into a fatigue tester or fatigue test machine and loaded using the predetermined test stress, then unloaded to either zero load or an opposite load. This cycle of loading and unloading is then repeated until the end of the test is reached. The test may be run to a predetermined number of cycles or until the sample has failed depending on the parameters of the test.

Specimen Size:

According to ASTM E606, it is desirable to obtain test specimens from sheet materials less than 6.0 mm (0.24 inch) thick.

For the duration of the test, the controlled temperature of the specimen should be Tn ± 2°C.

Data:

Strain controlled fatigue is reported in SI units or inch pounds and is considered as standard Separately.

For materials that are fatigue tested at temperatures other than ambient, all temperatures shall be Tn ± ∆T.

Where,

Tn = nominal test temperature in °C.

∆T= 2°C or 1% ×Tn °C whichever is greater.