This chapter treats the problem of describing load variability and also deals with the load interaction with fatigue strength, the load‐strength reliability problem. There are several methods for reliability assessment, and the choice of model complexity can be described in two ways. From a statistical modelling point of view, one may choose a first moment, a second moment or a full probabilistic model. From the physical modelling point of view, it is of interest to study the model response to the variation in the input variables. The choice is between a first‐order, that is a linear model, or second‐ or higher‐order models. The chapter presents the theoretical basis for the second‐moment formulation by presenting Gauss approximation formula and further evaluating the approach by means of a second‐moment, first‐order reliability index. The second‐moment approach is formulated as a special reliability index for fatigue life assessments, based on the load‐strength formulation.
Load Variation and Reliability
2013-09-20
32 pages
Article/Chapter (Book)
Electronic Resource
English
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