Comparative Analysis of Aluminum Alloys 2024 and 7085 under Thermal Fatigue and Crack Propagation

This research paper presents a study and a numerical investigation on the effect of the thickness of the samples on the crack growth as well as the phenomenon of fatigue. As well as the type of alloy used to withstand these physical deformations. Types of samples were designed from aluminum alloys 2024 and 7085 and compared with each other in bearing crack growth as well as the phenomenon of fatigue. The thermal effect was also seen on it by adjusting the temperature value in two cases, 20 degrees C and 40 degrees C. Where an additional processor was added to the Ansys program, which worked on the growth of the crack in a manner consistent with the phenomenon of fatigue. Where a pressure value of 4.8 MPa was applied from one side of the sample and it was fixed from the other side, where a time of 8000 s was taken. Where the results showed that the maximum deformation that was reached was 0.56 mm in the case where the thickness of the sample was 5 mm and the type of metal was aluminum alloy 7085. The value of bone deformation at a thickness of 5 mm is 0.66 mm, which is the highest value of deformation compared to the other cases. Aluminum alloy 7085 has reached a crack growth of 7.5 mm during 2777 cycles. While alloy 2024 has reached the same crack growth during 32784 cycles. The true meaning of the difference in properties between alloys can only be understood by comparing the mechanical properties of different alloys. Comparison of aluminum alloy 6061 with case with 3 mm primitive crack growth and 90 degree crack angle.