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Difference between "Range-Mean" and "From-To" cycle counting

Siemens Theorist

03-08-2017
12:40 PM

The unsymmetrical **From-To **cycle counting keeps more information about the loading cycles than **Range-Mean **counting does, because it also stores the "orientation" of each load cycle. This is important information if you want to reconstruct a time history from a Rainflow matrix.

The Rainflow counting of Simcenter Tecware (formerly called LMS Tecware) is a **From-To** cycle counting, and thus the default representation of the Rainflow matrices are also in **From-To** form.

However, Tecware also allows changing the representation to **Range-Mean** matrices. In fact, a **Range-Mean** histogram can always be derived from a **From-To** histogram, but not vice versa. This is because the **From-To** representation includes additional information (as mentioned above).

**Example:**

Look at the two load histories below:

They both have the same mean level and the same number of cycles, and the cycles' amplitudes are identical. The only distinctive property is the opposite polarity.

Looking at the Rainflow matrices of the two load histories, we get in the **From-To** representation:

The Rainflow matrix of "Load_up" shows *hanging* cycles, whereas the corresponding Rainflow matrix of "Load_down" shows *standing* cycles.

The denotation *hanging* and *standing* is motivated from the stress-strain-path. There, a *hanging* event is connected to the superior hysteresis branch at its upper reversal point, but a *standing* event is connected at its lower reversal point.

When a load cycle is just represented by its **range** and **mean**, the distinction between *hanging* and*standing* is not possible. Thus, the **Range-Mean** representation for both of the signals looks like this:

**Remarks:**

The desired representation of a Rainflow matrix can be set in the "RainView layout" window, which is available via the menu **Options ****à Layout** within the Rainflow matrix display.

Rainflow matrices can only be edited in the **From-To** representation.

Questions? Contact Siemens PLM GTAC support or post a reply.

**More Fatigue and Durability links: **

- History of Fatigue
- Stress and Strain
- Calculating Damage with Miner's Rule
- What is a SN-Curve?
- Rainflow Counting
- Difference between 'Range-Mean' and 'From-To' Counting
- Power Spectral Density
- Some Thoughts on Accelerated Durability Testing
- Goodman-Haigh Diagram for Infinite Life
- Measuring strain gauges in Simcenter Testlab
- Rosette Strain Gauges
- Calculating Damage in Simcenter Tecware Process Builder
- Strain Gauges: Selecting an Excitation Voltage

**Simcenter Tecware links:**

- Simcenter Tecware: Open Time Files fast!
- Simcenter Tecware: Overlay multiple signals in X and Y display
- Simcenter Tecware: Access to different file formats
- Simcenter Tecware: Spike Filter
- Simcenter Tecware: Removing Multiple Segments
- Simcenter Tecware: Calculate Infinite Life with the Goodman Diagram
- Calculating damage with Simcenter Tecware Processbuilder
- Running Simcenter Tecware with Simcenter Testlab tokens
- Butterworth filter "regular" and "zero phase"

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