Issue 50

A. Salmi et alii, Frattura ed Integrità Strutturale, 50 (2019) 231-241; DOI: 10.3221/IGF-ESIS.50.19 232 The resolution of this type of problem, within the framework of fracture mechanics, is carried out classically using the finite element method. But digital simulation of two-dimensional crack growth is challenging to simulate due to mesh-size reasons [1]. The asymptotic behavior of the displacement field in the vicinity of the crack front requires the local use of an extremely refined mesh size. Since the remeshing of the complete structure at each stage of the front is prohibitive, one solution is to isolate the discontinuity in a crack block, representing the strict vicinity of the crack, whose mesh size depends on the size of the defect and which can be inserted at any time into the rest of the structure, whose mesh size is fixed once and for all. We can mention, among others. Dhondt [2] proposed an alternative solution for local remeshing with a generation of hexahedral elements at the crack passage, within the same framework as the finite element method. More generally, there are so-called "mesh-less" methods, which, in principle, make it possible to get rid of all the difficulties associated with mesh size, but at a higher price. Jordan [3] studied the effect of the additional SDB (Slide Diamond Burnishing) parameters on the fatigue behavior of the 2024-T3 Al alloy has been studied experimentally. Samples of smooth, hourglass-shaped samples were blade-polished using different combinations of additional SDB parameters and then subjected to flexural fatigue tests. Residual stresses, introduced by the SDB, were measured by the X-ray diffraction technique. The microstructure close to the surface of the samples polished on a slide was studied. It has been established that the SDB produces two main effects, which depend on additional parameters of the SDB. The essence of the macro-effect is the creation of residual compressive stresses in the superficial and submarine layers. These constraints delay the formation and growth of fatigue macro cracks and thus increase the life of the polished components per blade. Monotonic tests were performed From KarakaŞ and Szusta [4] to determine the influence of temperature on the mechanical properties of the material. The purpose of the cyclic tests was to acquire the parameters required for the Manson-Coffin equation in order to plot the stress-fatigue life curves. In addition, the stress-strain behavior of the alloy and the cyclic hardening behavior were evaluated using the Ramberg-Osgood equation. The results obtained indicate that the fatigue life is reduced when the operating temperature increases. Punith Gowda [5] reveals the study of the mechanical properties of Al2024-tungsten carbide MMCs (Metal Matrix Composites) containing tungsten carbide (WC) particles. The reinforcing particles in Al2024 alloy ranged from 0% to 5% by weight. The results of this study revealed that as the tungsten carbide particle content increased, tensile strength, hardness, and Young modulus, compressive strength, increased. Significantly, accompanied by a reduction in ductility. Mohammad Zaki [6] reveals the influences of anodizing parameters of Al 2024 T3 in TSA (Tartaric-Sulphuric Acid) on the thickness, the weight and corrosion resistance of the anodized layer are studied. The corrosion resistance test was performed by running a salt spray test for 336 hours and anodic polarization measurements using a potentiostat. The results of showed that the most important factor in determining the thickness and weight of the anodized layer is the temperature, followed by the applied voltage, the voltage-temperature interaction, the temperature and the duration of the layer [6]. Figure 1 : Sample (30 mm*10 mm*2.29mm ) 10 mm 30 mm Plate thickness 2.29 Stress Crack Fixed end