Issue 50

F. Larbi Chaht et alii, Frattura ed Integrità Strutturale, 50 (2019) 331-341; DOI: 10.3221/IGF-ESIS.50.28 336 the properties of the structure, the same number of elements is used. Figure 3 shows a detail of the mesh used for the calculations. R ESULTS AND A NALYSIS enerally in structures, the geometric discontinuity such as the notch, has a weakness that quickly promotes their damage. These structures do not only undergo traction, which is the most dangerous solicitation, but also other loads that can undoubtedly accelerate their failure. During loading, the participants (stacking sequence / hybrid / geometric modification) play a determining role in the values of the resistance and the structural reaction to loading, are the parameters that have been evaluated in this work. It is by design that these cuts impose their existence in the structures, where often their damage will begin. From this problem, it is essential to look for a solution that takes the objective of reinforcement in order to delay the damage. Referring to the work of Benzaama[9].where the shape and size of the notch has been widely studied. In this study, only the reinforcement with the circular shape around the circular notch is limited by evaluating only the competition effect between the reduction of the thickness and the increase of the fiber volume fraction. Figure 4 : Geometrical modification around the notch. Figure 5 : Load displacement curve under tension loading . We made two changes: first when the thickness decreases and second when the thickness increases. The continuity of the fibers in the zones modified by a change of volume fraction and effectively of the thickness is ensured numerically by a change in the properties of rigidity and fracture of the composite if not, the calculation will take a discontinuity of the G