By Claude Bathias, André Pineau
Fatigue and fracture lead to billions of bucks of wear and tear every one year.? This e-book examines some of the factors of fatigue together with crack progress, defects, temperature, environmental, and corrosion.?
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Extra resources for Fatigue of Materials and Structures, 1st Edition
The fact that the results of a given type (failures, for instance) outnumber others is often due to the choice of a starting stage that is a long way from the value to be estimated. The sequence then begins with an uninterrupted test from a batch of the same type whose inclusion would lead to a systematic error. We count the number Niof implementations of this event for each test stage, and then number these stages with the attribution of value i = 0 to the lowest of those stages observed at least once.
It can also be used if we want to test, at the same time, the normal sigmoid shape of these curves (using tests) [FIN 72, ULM 521. x2 In other cases, it is better to apply application methods that are simpler, like ones presented in the next section. 2. Staircase method The drawbacks of the “probit” method led to the birth of other application methods that are simpler and cheaper. In 1948, Dixon and Mood [DIX 481 proposed the “staircase” method. The test stress stages can be found much more easily using this method.
67, vol. 269, p. 1. Introduction Scatter of the results of fatigue tests is now accepted to be an experimental and physical fact. In the past, following a deterministic way of thinking, such scatter was considered to be due to imperfections in the test conditions and, as a consequence, it was assumed that scatter could be reduced ad libitum. The scatter is to be considered as a physical aspect of fatigue phenomenon. Moreover, from a practical point of view it is generally far too difficult and/or expensive to entirely remove some of the causes of experimental error, even if it is possible in theory.