This paper describes analytical models that are commonly used for product life estimation and accelerated life testing. Model descriptions include: Miner's "Rule" for describing accumulated fatigue damage; Coffin-Manson nonlinear power law, often applied to mechanical fatigue damage; Rudra model for CFF failures; Arrhenius steady-state temperature acceleration model for estimating chemical aging effects; Peck's model for accelerated combined temperature-humidity effects; and Kemeny model for combined temperature and voltage acceleration effects.
The general form of these models will be presented along with specific guidance regarding: relative strengths and appropriate applications for each model; limitations and sources of uncertainty for each model; and example values for exponents and material coefficients.
This paper highlights the significant changes introduced with the F-revision of MIL-STD-810, "Test Method Standard for Environmental Engineering Considerations and Laboratory Tests." The major emphasis on test tailoring presented in Part One of the document is described. Significant features of each test method in Part Two are briefly summarized. Detailed discussions of each test method are beyond the scope of this document.
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