Issue 50

A. Salmi et alii, Frattura ed Integrità Strutturale, 50 (2019) 231-241; DOI: 10.3221/IGF-ESIS.50.19 239 Maximal value of the Von-Mises stress due to the thermo-mechanical effect is located at the level of the crack axis. Stress distribution is very different with singularities at the x-position in the thickness. In an aluminum alloy plate, the stresses range from 0 MPa to 100 MPa. The difference is quite significant, around 20 MPa, so we can observe the good thermal and mechanical behavior. Decrease in stress on the inside edge. If the temperature increases, the equivalent stress increases at any temperature, which validates the published results. Variations in equivalent stress according to Vos-Mises as a function of axial displacement are represented in Figs. 8 < A (a=5.08mm); B (a=5.50mm); C (a=6.34mm); D (a=7.18mm)> at different temperatures for crack width between 5.08 and 7.18. 5,0x10 3 1,0x10 4 1,5x10 4 2,0x10 4 2,5x10 4 3,0x10 4 -1x10 7 0 1x10 7 2x10 7 3x10 7 4x10 7 5x10 7 6x10 7 7x10 7 8x10 7 9x10 7 1x10 8 1x10 8 stress (Pa) Displacement (um) t=30°C t=40°C t=50°C t=60°C 10000 15000 20000 25000 30000 35000 -1x10 7 0 1x10 7 2x10 7 3x10 7 4x10 7 5x10 7 6x10 7 7x10 7 8x10 7 9x10 7 1x10 8 1x10 8 stress (Pa) displacement (um) t=30°C t=40°C t=50°C t=60°C A B 20000 25000 30000 35000 40000 45000 50000 55000 -1x10 7 0 1x10 7 2x10 7 3x10 7 4x10 7 5x10 7 6x10 7 7x10 7 8x10 7 9x10 7 1x10 8 1x10 8 stress (Pa) displacement (um) t=30°C t=40°C t=50°C t=60°C 4x10 4 5x10 4 6x10 4 7x10 4 8x10 4 9x10 4 -1x10 7 0 1x10 7 2x10 7 3x10 7 4x10 7 5x10 7 6x10 7 7x10 7 8x10 7 9x10 7 1x10 8 1x10 8 stress (Pa) displacement (um) t=30°C t=40°C t=50°C t=60°C C D Figure 8: Variations in equivalent stress according to Von-Mises as a function of axial displacement at different temperatures C ONCLUSIONS he obtained results reveal a difference in behaviour at the selected node levels relative to the conditions imposed by the proposed model. Thermo-mechanical input was found to show a significant increase in stress relative to the elasticity threshold of this 2024 T3 aluminum alloy, relative to mechanical input. The following conclusions can be made: - The proposed model is used to determine the number of Ni loading cycles required to initiate fatigue damage through certain loading cycles and the introduction of adequate material fatigue parameters. The method used for numerical