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A statistical model for crack growth based on tension and compression Wöhler fields

✍ Scribed by Enrique Castillo; Alfonso Fernández-Canteli; Hernán Pinto; María Luisa Ruiz-Ripoll

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
261 KB
Volume
75
Category
Article
ISSN
0013-7944

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✦ Synopsis

First, the general form of a physically valid crack growth model is derived based on functional equations. It results that only a single argument function is required to define the model, and that models not satisfying this condition are incompatible. Second, a statistical crack growth model valid for any combination of r min , r max is presented. The model is based on an existing fatigue model based on physical, statistical and compatibility conditions, which predicts the Wöhler fields for any constant load test. It is shown how standard fatigue tests combined with one single crack growth test, can be used to derive a general formula for fatigue growth. This model is applied to some real data to illustrate its applicability to practical problems, and the results seem to be very promising.

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