Peening Fatigue Gain
Quantify measured fatigue-life improvement after laser shock peening.
Description
Fatigue-life comparison summarizes matched tests before and after peening.
Fatigue-life comparison summarizes matched tests before and after peening. It reports improvement on the supplied cycle basis.1
Quantify measured fatigue-life improvement after laser shock peening.
When to use Peening Fatigue Gain
Use this tool to quantify measured fatigue-life improvement after laser shock peening.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use Peening Fatigue Gain and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter baselineFatigueCycles, peenedFatigueCycles using the field table and calculation rules, then run the tool.
- Read fatigueLifeRatio, fatigueLifeGainPercent, additionalCycles. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| baselineFatigueCycles | Baseline fatigue life (cycles) | number; minimum: 0 | Required |
| peenedFatigueCycles | Peened fatigue life (cycles) | number; minimum: 0 | Required |
Enter positive baseline and nonnegative peened cycle values. Fractional values are accepted. Return ratio, signed gain and additional cycles.
ratio=peened/baseline; gain%=100(ratio−1); additional=peened−baseline Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| fatigueLifeRatio | Peened-to-baseline life ratio | number; minimum: 0 |
| fatigueLifeGainPercent | Fatigue-life gain (%) | number |
| additionalCycles | Additional fatigue cycles (cycles) | number |
{
"input": {
"baselineFatigueCycles": 1000,
"peenedFatigueCycles": 1500
},
"output": {
"fatigueLifeRatio": 1.5,
"fatigueLifeGainPercent": 50,
"additionalCycles": 500
}
}Limitations and assumptions
No fatigue distribution, load equivalence, uncertainty or process causality is established.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Surface-Roughness Improvement: Calculate absolute and percentage surface-roughness improvement. For a complementary task, use Welding Mode Threshold: Compare weld intensity with a caller-supplied keyhole transition threshold.
References
-
Peening Fatigue Gain — tool.io
Similar or alternative tools
- Surface-Roughness Improvement
Calculate absolute and percentage surface-roughness improvement.
- Welding Mode Threshold
Compare weld intensity with a caller-supplied keyhole transition threshold.