feat: add S-N fatigue damage analysis - #8
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savbcar
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Aug 15, 2026
savbcar
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- adds generic power-law S-N fatigue modelling
- calculates cycles to failure from stress amplitude
- implements Palmgren-Miner cumulative damage
- supports multi-block loading spectra
- estimates repeated-spectrum fatigue life
- identifies the dominant fatigue loading block
- includes strict input validation
- adds test-first unit coverage
- documents fatigue-model assumptions and limitations
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