Fit TTF data to life-distribution (for eg. 2P Weibull) for each stress level, and estimate parameters - each distribution with different eta but same beta (for the same failure mechanism).
Life distribution characteristic (eta) is a function of stress & is equated to stress level using a given Life-Stress-Relationship (LSR) - for eg Eyering Model
Estimate model constants
Now, knowing model constants, estimate eta at various stress levels, including at use level. And knowing beta (for the given failure mechanism) use-level life distribution can be predicted.
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