The Palmgren-Miner Rule is a method used to predict the fatigue life of materials subjected to varying loads over time. It states that the cumulative damage caused by repeated loading cycles can be assessed by summing the fraction of damage for each load level experienced, where each fraction is defined as the ratio of the number of cycles at a given load to the number of cycles to failure at that load. This rule provides an effective approach for engineers to estimate how different loading conditions will affect the overall lifespan of components and structures.
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