Reliability and damage

In this chapter, we introduce the issues of design life, a background to structural reliability and some possible tools that can be useful when we go from concept to reality in our designs for habitats on the Moon. Reliability can be interpreted as the probability that the designed object will function within the design guidelines for the design life. A reliability design often includes an estimate of a rate of failure, perhaps as a function of time. A corollary of reliability is durability, which is a quantitative assessment of how an object ages over time and is still able to operate within the design guidelines. For mechanical components, aging occurs due to high-cycle fatigue, corrosion, other forms of wear, design stress exceedances, impacts, and friction effects, for example.

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