Three-bin linear-damage screen
Miner cumulative damage
Inputs
User-entered applied cycle count at stated life N1.
User-entered reference cycles-to-failure; no S-N curve is generated.
User-entered applied cycle count at stated life N2.
User-entered reference cycles-to-failure; no S-N curve is generated.
User-entered applied cycle count at stated life N3.
User-entered reference cycles-to-failure; no S-N curve is generated.
Results
Bin 1 cycle ratio
0.1
1Bin 2 cycle ratio
0.1
1Bin 3 cycle ratio
0.1
1Three-bin linear damage sumD
0.3
1D = n1/N1 + n2/N2 + n3/N3
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Axial response · Beam deflection & reactions · Elastic stability · Solid-shaft torsion
Method
Formula, when it applies, and when it does not
Calculate a bounded three-bin Miner cycle-ratio sum from applied cycles and cycles-to-failure.
D = n1/N1 + n2/N2 + n3/N3
When
- Three user-entered bins
- Linear damage summation
- Stated constant-amplitude lives
- No sequence effects
Don’t
- This three-bin Palmgren-Miner sum excludes sequence effects, stress-history generation, S-N curve fitting, nonlinear damage, crack growth, reliability, safety factors, failure prediction, and design approval.
Miner (1945), Cumulative Damage in Fatigue, J. Appl. Mech. 12