Issue 33

R. Sepe et alii, Frattura ed Integrità Strutturale, 33 (2015) 451-462; DOI: 10.3221/IGF-ESIS.33.50 459 Loading condition Material Member Maximum stress [MPa] for original str. Maximum stress [MPa] for modified str. Allowable stress [MPa] 1 Al 6061 T6 65.4 53.2 173 Al 2024 T3 7.1 5.9 252 Al 7075 T651 32.2 28.1 360 Al 2024 T351 12.2 8.2 252 2 Al 6061 T6 33.2 25.4 173 Al 2024 T3 15.3 12.3 252 Al 7075 T651 26.6 23.5 360 Al 2024 T351 4.8 2.8 252 3 Al 6061 T6 75.2 53.8 173 Al 2024 T3 31.1 27.1 252 Al 7075 T651 35.5 28.2 360 Al 2024 T351 11.3 8.7 252 4 Al 6061 T6 196.2 159.6 173 Al 2024 T3 21.3 17.7 252 Al 7075 T651 96.6 84.3 360 Al 2024 T351 36.6 24.6 252 5 Al 6061 T6 87.2 76.0 173 Al 2024 T3 39.5 33.5 252 Al 7075 T651 63.3 56.2 360 Al 2024 T351 14.2 10.1 252 6 Al 6061 T6 122.5 102.5 173 Al 2024 T3 91.6 75.6 252 Al 7075 T651 92.6 84.7 360 Al 2024 T351 63.6 58.4 252 Table 6 : Maximum von Mises static stress results in the members of the structure compared with the allowable limits. Loading condition Max. displ. [mm] for original str. Max. displ. [mm] for modified str. Allow. displ. [mm] 1 0.9 0.7 4 2 0.6 0.3 4 3 0.5 0.4 4 4 2.7 2.1 4 5 1.0 0.8 4 6 1.3 1.0 4 Table 7 : Maximum displacement results compared with the allowable limits. Tab. 8 presents the maximum von Mises stress under fatigue loading in the members of the modified roof module structure. All values are less than the allowable limits.