Crack Growth under Random Loading: Fatigue Cycle Analysis for Testing and Life Predictions

摘要

The Rainflow cycle counting technique which is valid for fatigue crack growth analysis. This technique was incorporated into a procedure for engineering predictions of crack propagation life under random loading on the basis of experimental data for constant amplitude loading. Predictions require less computer time and offer an accuracy which favorably compares to that of existing techniques. A realtime computer procedure was developed for Rainflow based on on-line modification of random load sequencies during crack growth testing. On-line load sequence modification opens new possibilities in computer controlled testing.