Abstract
The structures in service are subjected to loads whose amplitude varies most often over time. These differences in loading cycle levels will have a direct impact on the propagation of cracks that can lead to accelerations or slowdowns in the propagation speed of these cracks. Indeed, the delay of the propagation of a crack produced by the application of a simple overload depends on several parameters, such as the material, the loading, the geometry of the specimen and the environment. In this paper, we will try to master more light only on the influence of the loading parameters such as the load ratio, the overload rate on crack propagation, the propagation speed, the number of delay cycle, using the AFGROW calculation code and the willenbourg model, which describes the delay after applying overloads.
Highlights
The prevention of breaks in service is an ongoing objective of designers, builders and users, in both energy sector, oil sector,aeronautical sector, rail and road transport, public works, consumer goods [1,2,3].Structures subjected to cyclic loadings can undergo large variations in their behaviour ranging from the phase of plastic deformation to breaking through damage depending on the nature of the stresses
The constant nature of these stresses at constant amplitude implies the use of laws and models which are mastered by the current computation codes, currently, the PARIS law is the expression most used in fatigue research work with constant amplitude, it should be noted that this relation is applicable only in the field of slow crack propagation and it does not take into account what happens in domain I and III [4,5,6]
F ollowing this study, which was conducted to predict the fatigue behavior of aluminium 2024T351 used in aircraft construction, and in light of the results presented, it can be concluded that: The application of a simple overload affects several parameters, such as the cracking rate, crack propagation and the number of delay cycles
Summary
The prevention of breaks in service is an ongoing objective of designers, builders and users, in both energy sector (thermal power stations, alternators), oil sector (gas pipelines, pipelines),aeronautical sector ( cells), rail and road transport, public works (bridges, dams, piers), consumer goods (automobiles) [1,2,3]. It has been found that the application of an overload cycle during a fatigue crack propagation leads to a slowing of the crack propagation speed, in some cases to a stop of this crack [10,11,12], this phenomenon of delay due to the application of an overload, several authors [13,14,15], proposed different models to explain the causes due to the slowing of the crack propagation speed These different approaches can be grouped into three categories of models, based on: i) the interaction effects of the plastic areas at the tip of the crack. We will use the AFGROW calculation code and the model describing the delay of Willembourg to study the influence of the application of simple overload on different parameters such as, crack spread, crack rate and overload rate
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