Fatigue Testing with FlexPro®: Counting Procedures Analysis
Counting procedures like the Rainflow counting procedure have proved to be an invaluable analysis tool in fatigue testing applications. Counting is based on a search for specific events in the load-time function, e.g. a certain load level being exceeded or a load alternation of a certain amplitude. For this purpose, the range of values of the load-time function is divided into discrete intervals, or classes. Each event found is assigned to a class and counted in this class.
Markov matrix and Rainflow matrix in range-mean format as well as symmetrical and asymmetrical from/to format. The residual of the rainflow count can optionally be included in the result.
- Range filter
Suppresses small load changes.
- Class divisions
Automatic, via start and width of class, begin and end, symmetrical or via external data set.
- Derived collectives
Peaks and troughs, positive and negative ranges and range pairs, positive and negative level crossings.
Absolute, relative, percentage and cumulative.
- Counting procedures according to DIN 45667
Sampling, maximum value and time-at-level.
- Compound counting procedures according to DIN 45667
Sampling, maximum value and time-at-level from two input data sets with separate class division for each data set.