ISO DIS 12110-2

Description / Abstract: This part 2 of ISO 12110 presents cycle counting techniques and data reduction methods which are used in variable amplitude fatigue testing.

For each test or test series, cycle counting is mandatory whereas data reduction methods are optional.

The present part 2 supports the part 1 which contains the general principles and describes the common requirements about variable amplitude fatigue testing.

In this part, the term "loading" refers either to force, stress or strain since the methods presented in this document are valid for all.

The following issues are not within the scope of this part 2 and therefore will not be addressed:

-Constant amplitude tests with isolated overloads or underloads.

-Large components or structures.

-Environmental effects like corrosion, creep, ...linked to temperature/time interactions leading to frequency and waveform effects.

-Multiaxial loading.

NOTE 1 Phasing is of prime importance when dealing with multiaxial tests under either constant or variable amplitude controlled loading.

NOTE 2 Although frequency variations during cycling are not outside of the scope of this standard, the following clauses deal only with constant frequency cycling.