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Stress Life Calculations
Strain Life Calculations
Stress-Strain Plotting
Power Law Fit/Regression Analysis
Linear Elastic Fracture Mechanics
Notches with Stress Life
Notches with Strain Life
Multi-axial Fatigue Analysis
Variable Amplitude Analysis (future)
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References
Cyclic-Stress-Strain Plotting
Life determination using strain histories.
εais defined as the strain amplitude
εa is defined as Δε/2
2Nf is defined as Number of reversals to failure
Eis defined as Young's Modulus
σf' is defined as the fatigue strength coefficient
εf'is defined as the fatigue ductility coefficient
b is defined as fatigue strength exponent (Basquin's exponent)
c is defined as fatigue ductility exponent
n' is defined as b/c
K' is defined as σf' / (εf')n'
E ksi
K' ksi
σf' ksi
εf'
n'

Strain History
Low Guess
High Guess




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