چكيده به لاتين
Space is very dangerous, costly and challenging. So that the environmental conditions in this domain are not comparable to the conditions of the Earth's surface. Threats such as space vacuum, extreme temperature variations, debris and micrometeoroids can have harmful effects on satellite performance, which in result reduce the lifetime of the satellite or the failure of the mission and exaction high cost therefore space structures should be able to continue their mission in these difficult conditions.
Each satellite that is located on Earth orbits for the best performance at a given time, must meet the requirements and conditions in the manufacturing Process .
One of the most important requirements is to select the good material according to the environmental conditions and type of satellite mission
A great contribution of success or failure in the space domain depends on the choice of appropriate material. Cost, proper operation, safety, life-cycle depend on the type of selected material.
Materials selection is not based on assumptions.But in a regular framework and in regard with the requirements and constraints
In this project ,the molecular dynamic simulation use to study mechanical and thermal properties of the aluminum by adding a certain percentage of graphene .collections of the results are expressed as follows By adding 4.2wt% graphene, Young's modulus, ultimate strength and toughness, compared to aluminum increase to 52%, 20% and 38%, respectively.
The effect of graphene on the thermal properties of aluminum shows that with the addition of 8.2 wt% graphene, the thermal expansion coefficient decreases by 16%, while 6.3% of graphene results in an increase of 19.8% in aluminum thermal conductivity.
The effect of graphene on mechanical and thermal shock of aluminum is also studied. In the mechanical shock section, by adding graphene, the composite strength increases against the impact of the ballistic shock and in the thermal shock section, the addition of graphene reduces the amplitude of thermal stress, increases heat transfer and reduces the destructive effects of shock. Finally, graphene can improve the performance of aluminum as an effective space material.
Keywords: space domain, material selection, aluminum, graphene, material properties, simulation
