Examinando por Autor "Guerrero, John William Grimaldo"

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    Investigating the effects of geometrical parameters of re-entrant cells of aluminum 7075-T651 auxetic structures on fatigue life
    (MDPI, 2023-02-10) Ghiasvand, Amir; Fayazi Khanigi, Alireza ; Guerrero, John William Grimaldo; Derazkola, Hamed Aghajani; Tomków, Jacek; Janeczek, Anna; Wolski, Adrian
    In this study, the effects of two geometrical parameters of the re-entrant auxetic cells, namely, internal cell angle ((Formula presented.)) and H/L ratio in which H is the cell height, and L is the cell length, have been studied on the variations of Poisson’s ratio and fatigue life of Aluminum 7075-T6 auxetic structures. Five different values of both the H/L ratio and angle (Formula presented.) were selected. Numerical simulations and fatigue life predictions have been conducted through the use of ABAQUS (version 2022) and MSC Fatigue (version 11.0) software. Results revealed that increases in both the H/L ratio and angle (Formula presented.) improved the average value of Poisson’s ratio. Increasing the H/L ratio from 1 to 1.4 and (Formula presented.) from 50° to 70° increased the values of Poisson’s ratio, respectively, 7.7% and 80%. In all angles, increasing the H/L values decreased the fatigue life of the structures significantly. Furthermore, in all H/L values, an increment in (Formula presented.) caused a reduction in fatigue life. The effects of H/L and (Formula presented.) parameters on fatigue life were dominant in the low cycle fatigue regime. Results also showed that the H/L ratio parameter had greater influence as compared to the (Formula presented.) angle, and the structures with higher auxeticity experienced higher fatigue resistance. It was found that the auxetic property of the structure has a direct relationship with the fatigue resistance of the structure. In all samples, structures with greater auxetic property had higher fatigue resistance.