Enrique Castillo's A unified statistical methodology for modeling fatigue PDF

By Enrique Castillo

ISBN-10: 1402091818

ISBN-13: 9781402091810

ISBN-10: 1402091826

ISBN-13: 9781402091827

The booklet provides a unified probabilistic method of assessment of fatigue harm, together with all steps to be undefined, beginning with fatigue checking out making plans, fabric characterization via lab experiments, version choice, parameter estimation and harm assessment and lifestyles prediction linked to a given tension or pressure background. It additionally treats laptop courses to do the entire above.

In addition, a serious review of present versions in line with the hot proposed substitute version is among the major goals of the e-book, attempting to swap the minds of engineers concerned about layout jobs.

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Extra info for A unified statistical methodology for modeling fatigue damage

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2. DIMENSIONAL ANALYSIS 39 of variables V ∗ ≡ {N/N0 , Δσ/Δσ0 , p}. This means that any existing relation r(N, N0 , Δσ, Δσ0 , p) = 0 among the independent five variables in set V can be written in terms of only these three dimensionless variables: r(N, N0 , Δσ, Δσ0 , p) = 0 ⇔ f N Δσ , ,p N0 Δσ0 = 0. 2) where q() is a function to be determined. The important result is that only the dimensionless quotients N/N0 and Δσ/Δσ0 have any influence on the probability of failure p, so that either N/N0 and Δσ/Δσ0 , or any monotone functions of them, such as h(N/N0 ) and g(Δσ/Δσ0 ) have to be considered.

Have been proposed in the literature (see, for example, Refs [7–18] and references in Castillo et al. (1985)) to fit experimental data. 2. However, unfortunately, not all are physically valid models. For a model to be valid it must have the same functional form irrespective of the units of measurements of the different variables involved. For example the model log N = A − B log Δσ requires all summands to have the same units of measurement. Since N is lifetime and Δσ is stress, the constants A and B must have dimensions and they need to be different, and hence, if the units of the data are changed the values of the constants A and B must be modified accordingly.

42) implies that: V = (log N − B)(g(Δσ) − C) ∼ W (λ, δ, β). 47) reveal that the probability of failure of a piece subject to a stress range Δσ during N cycles, depends only on the product β V = (log N − B)(g(Δσ) − C) or V = (log N − B) (g(Δσ) − C)γ , showing that V is useful to compare fatigue strength at different, but constant, stress levels, and can be considered as a normalizing variable. As a summary of the whole process undertaken to derive the proposed S-N field Weibull model, we include Fig.

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A unified statistical methodology for modeling fatigue damage by Enrique Castillo


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