Abstract
Durability assessment is essential for assuring the reliability and safety of automotive structures, which subjects to complex random variable amplitude loadings. In this article, the application o...
Highlights
Durability assessment is essential for assuring the safety of mechanical structures and components subjecting to random variable amplitude loading in the long-term service
Based on the stress–displacement relationship, the time history of structural stress at failure locations were determined for the fatigue assessment
In addition to the abovementioned, the results indicate that the sequence effects and load cycle interaction effects are not obvious in the random variable amplitude load histories, since the calculated fatigue life with damage curve approach (DCA) and DLDR is of lower accuracy compared to Palmgren-Miner Rule (PMR), which ignores the two effects
Summary
Durability assessment is essential for assuring the safety of mechanical structures and components subjecting to random variable amplitude loading in the long-term service. The durability assessment is performed based on the fatigue damage theory which combines damage accumulation rule with the stress–life (S-N) relation from constant amplitude tests and proper cycle counting method. As discussed in the literature, the major shortcomings of PMR are supposed as ignoring the effect of stress amplitudes below the fatigue limit, assuming the fatigue damage accumulation to be linear, and not accounting for the load sequence effect.[3,4] Many alternatives, such as modified Miner Rule (MMR), relative Miner Rule (RMR), double-linear
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