THE EFFECT OF PERIODIC-RANDOM LOADING ON FATIGUE CRACK GROWTH
A theory of fatigue crack growth based on the concept of damage accumulation is presented which takes some account of the effect of periodic-random loading. The Dugdale model of plasticity is used to calculate the distribution of the energy dissipated during stress cycling in the plastic zones of a crack embedded in a material sample of infinite extent. The author shows how to calculate the damage accumulated by decomposing the random group of stress levels into significant complete stress cycles of various amplitudes. A simple short numerical algorithm is presented which performs this decomposition. A crack-growth law is derived having a very simple form which automatically incorporates the condition for catastrophic failure.
National Physical Laboratory, EnglandQueens Road
Teddington, Middlesex, England
- McCartney, L N
- Publication Date: 1975-7-8
- Features: Appendices; Figures; References;
- Pagination: 31 p.
- TRT Terms: Algorithms; Cracking; Deformation curve; Fatigue cracking; Steel; Stochastic processes; Structural analysis
- Uncontrolled Terms: Fatigue analysis
- Subject Areas: Data and Information Technology; Railroads;
- Accession Number: 00172927
- Record Type: Publication
- Report/Paper Numbers: N B-630 Prepub Rpt
- Files: TRIS
- Created Date: Mar 29 1978 12:00AM