Strain energy density function

Low-cycle fatigue

Sound power

Engineering

Classification of discontinuities

Critical distance

Statistics

Materials science

Structural integrity

Fatigue testing

Energy (signal processing)

Sound (geography)

Computer science

Acoustics

Strain (injury)

Mechanical engineering

Physics

Finite element method

Mathematics

Microstructure

Strain energy

Superalloy

Internal medicine

Mathematical analysis

Composite material

Turbine

Structural engineering

Medicine

Gas turbines

International Journal of Fatigue

For aeroengine components with geometrical discontinuities like notches, low cycle fatigue (LCF) life prediction is critical for ensuring the engine structural integrity. In this regard, a concept of strain energy gradient is elaborated and a general procedure combining this concept with theory of critical distance is established for LCF life prediction of notch components, which relates its life with the strain energy distributed within the effective damage zone. For GH4169 and TC4 notched specimens as well as a case study of a high pressure turbine disc, the proposed procedure provides better life correlations than models of Fatemi-Socie and Smith-Watson-Topper.

Strain energy gradient-based LCF life prediction of turbine discs using critical distance concept