tabassco/woehler

woehleR

A R package with useful calculations for endurance-strength of ferrous materials. Developed based on a course at TU Darmstadt.

Calculations

Rainflow Matrix

Rainflow Matrix: Denotes the stress cycles with the from and to categories. Counting each cycle with the [i,j] position. To get the individual connections the 4-point algorithm is used.

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Inputs:

• stress values: 2 coloumn data-frame with order-id / time-stamp and stress values
• n - Amount of categories to be used

Returns:

• n x n Matrix

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Usage::

reduced_test_data <- rainflow(time_series, n = 16)

Plots

Rainflow Plot (2D - Tile)

A 2D tile plot, based on the rainflow matrix, showing the distribution of the external stress.

Woehler Curve (S-N-Curve)

Standard Woehler curve.