چكيده به لاتين
Metal matrix composites are considered and selected by researchers in cases where a combination of high strength, specific and directional stiffness, high strength-to-weight ratio, and appropriate ductility are required. However, in some of these materials, such as Metal structure with dispersed particles considered in this research, the matrix and reinforcement have a different application by improving mechanical properties, and they are placed together to provide optimal performance. Experimental and laboratory research cannot provide sufficient information about the micromechanical aspects affecting the mechanical behavior of composite materials. Thus, researchers have developed various micromechanical methods with the help of simulations and finite element analysis softwares, in order to accurately predict the mechanical behavior of microstructure composite materials. Therefore, in this research, through a review of articles and basic concepts, the methods of calculating the mechanical behavior of composite materials have been examined and compared. A major part of the research focuses on creep and swelling of Metal structure, which are the main and most influential behaviors of these materials. For this purpose, after choosing the most suitable numerical micromechanical modeling method, by applying boundary conditions and applying equivalent forces, creep and swelling phenomena are investigated on the volumetric element. To calculate the swelling of composite materials, the creep equation between the middle component of the particle and the matrix (interaction layer) is required, which has been ignored in most previous investigations due to simplification. In this research, due to have that the creep equation for the components of the metal matrix composite material with dispersed particles and considering a representative volumetric element in the form of a finite element, the creep equation of the homogenized composite material or the intermediate phase is extracted with the help of numerical data output and curve fitting. Through the obtained creep rate equation, it was determined that the difference between the results of swelling by applying the interaction layer and the results of the inert matrix, in the presence and absence of creep in the matrix, for the temperature of 700 degrees Kelvin, is 15.6% and 14.7%, respectively. This amount of difference shows that the application of the interactive layer is successful and leads to more accurate results.
