Simulation of the delay effect after applying a simple overload on alloys of aluminum 2024T351 using the Willemborg model

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, study the influence of the loading parameters such as the load ratio, and the overload rate, on both crack propagation, propagation speed, number of delay cycle, is investigated by using the AFGROW code and the willenbourg model, which describes the delay after applying overloads.

Study of overloading retardation on fatigue crack propagation behavior in 300M steel

“…Abhay et al 11 studied the effect of overload ratio on the overload delay effect of 7075‐T651 in shear overload and found that the fatigue life increased with the increase of shear overload ratio. Bahram et al 12 used the Willenberg model to simulate the deceleration effect after applying an overload to 2024‐T351 aluminum alloy, and the results showed that the application of simple overload affects the crack rate, crack growth, and number of delay cycles. When Lu et al 13 studied and analyzed the fatigue crack growth behavior of QSTE340TM steel under a single tensile overload, they found that the load ratio and overload ratio had a greater impact on the fatigue crack growth behavior, and also proved the plasticity‐induced crack closure effect.…”