جستجوی مقالات مرتبط با کلیدواژه "7075 aluminum" در نشریات گروه "مکانیک"

While bare Aluminum does not have the desired properties for aerospace and naval industries, when converted to composite by reinforcing materials, the desired mechanical and other properties are achieved. In this study, Aluminum 7075-T6 was selected as the base phase and Silicon Carbide (SiC) particles were used as the reinforcing phase for the composite for the experiments on the yield strength, ultimate tensile strength, and fatigue life. According to the experiment design, the SiC was prepared with three different particle sizes, in nanometer, submicron and micron scales. SiC powder with different mass fractions with Aluminum was cast by vortex casting by a resistive furnace equipped with an electromagnetic coil and a vacuum pump, and the composite samples were cast according to the experimental design. The samples were then subjected to dissolution. Afterward, T6 heat treatment was performed on the samples. Ultimately, the prepared experimental samples were subjected to tensile and fatigue tests, followed by the relevant standards. According to the results, reinforcement of aluminum 7075-T6 with SiC particles improved properties such as yield strength, ultimate tensile strength, and fatigue life, but reduced the elongation and ductility of the samples. The results indicate that 1% sample with nanoparticle size has improved the final tensile strength by 21.33% and has the highest fatigue strength.

To predict static aeroelastic behavior accurately, two-way fluid and structure interaction (FSI) coupling methods are used to calculate the static deformations and aerodynamic characteristics of the deformed rocket. According to the studies, little research has been done on the weight reduction of space structures. Therefore, due to the stratigicness of the Fin of space structures, the mechanical behavior of the sheets for the construction of the Fin has been experimentally studied using a constrained groove pressing (CGP) method and a comparison has been done between the amounts of deviation caused for a rocket flying in different Mach numbers and different angles of attack, by simulating a two-way FSI Method for WAF and Flat Fins models with two types of material, the CGP 7075-T6 aluminum, and the 4130 steel. Results of constrained groove pressing show that with the increase in the steps of this process, 7075-T6 aluminum with 38% increase of yield strength in fourth transit, 34% increase in tensile strength, 40 percent decrease in elongation, and 62% increase in toughness relative to the prototype, will be produced. The total deviation in WAF Fin is much less than the flat Fin. Also, deviations of Fin made of CGP 7075-T6 aluminum is less than the Fin made of 4130 steel.