In-time Monitoring of Fatigue Damage

In-time monitoring of the fatigue damage for a structure in a real operation is the complex problem, including:•measurement of the operational loading and evaluation stress-strain state•transformation of the loading into a critical section (notch)•using the material properties for a corresponding material•in-time calculation of the fatigue damage increase, etc.This contribution includes the brief analysis of these steps and explains the processing of the measured deformation state without re-calculation the strain into stress in detail and presents the results from the installed in-time monitoring system of the fatigue damage in a real operation of gas pipelines.