Fatigue cycle range counting calculator

Calculate rainflow [range,mean,count] cycles and equivalent counted cycles with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use rainflow [range,mean,count] cycles and equivalent counted cycles to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Load or stress history samples (same units)
0,5,-3,4,-2,0
Rainflow [range,mean,count] cycles (JSON)
[[5,2.5,0.5],[8,1,0.5],[7,0.5,0.5],[6,1,0.5],[2,-1,0.5]]
Equivalent counted cycles
2.5

Try another scenario

Load or stress history samples (same units)
[1, 5, -3, 4, -2, 0]
Rainflow [range,mean,count] cycles (JSON)
[[4,3,0.5],[8,1,0.5],[7,0.5,0.5],[6,1,0.5],[2,-1,0.5]]
Equivalent counted cycles
2.5
Calculation method

Calculation method

Rainflow [range,mean,count] cycles (JSON)

Turning-point three-point rainflow algorithm; closed internal cycles count 1 and open residuals count 0.5. No periodic closure imposed.

Equivalent counted cycles

Turning-point three-point rainflow algorithm; closed internal cycles count 1 and open residuals count 0.5. No periodic closure imposed.

Symbols and units
a
Load or stress history samples (same units)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Turning-point three-point rainflow algorithm; closed internal cycles count 1 and open residuals count 0.5. No periodic closure imposed. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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