6005A aluminum sheet for metro

6005A is a typical Al Mg Si aluminum alloy. It has been widely used in aerospace, transportation and other industrial fields because of its medium strength, good plasticity and processability, especially its excellent stress corrosion cracking resistance. With the rapid development of rail transit industry, higher and higher requirements are put forward for aluminum alloy materials for car body

The design has developed from a single static strength theoretical design to anti fatigue design, and the corresponding requirements for structural materials have changed from only static strength to focus

Note: the direction of comprehensive service performance of toughness and fatigue failure resistance changes. Therefore, the study on the fatigue properties of aluminum alloy sheet for subway is of great significance to its engineeringCheng's military service has important practical significance.

1) The median fatigue limit S50 of 6005A aluminum sheet fatigue specimens with 4 mm and 12 mm original plate thickness shows the law of S50 (4 mm) ＞ S50 (12 mm) and S50 (L direction) ＞ S50 (t direction), and the median fatigue limit S50 of 6005a-t6 aluminum alloy sheet fatigue specimens with 20 mm and 40 mm centers shows the law of S50 (20 mm) ＞ S50 (40 mm) and S50 (L direction) ＞ S50 (t direction), The tensile strength RM has the same law as that of aluminum alloy plates with different thickness.
(2) the main reason for the high median fatigue limit of 4 mm and 20 mm thick plates is that the impurity phase of 4 mm thick 6005A aluminum sheet is small and less than 12 mm thick aluminum plate, and that of 20 mm thick 6005A aluminum sheet is small and less than 40 mm thick aluminum plate. The distribution of impurities in the plate along the rolling direction is directional, which is the main reason why the median fatigue limit in L direction is higher than that in t direction.
(3) the fatigue fracture of plates with different thickness shows delamination, and the delamination of fatigue fracture of plates increases with the increase of thickness.