| 초록 |
In this work, aluminum-based particulate-reinforced metal matrix composites with different distribution (in three unit cell models) and different volume percentage (from 10 to 90 volume percentage) of reinforcement particle is studied through two simulation approaches, finite element (FE) and Fast Fourier Transform (FFT) methods in the context of crystal plasticity. For this study, a viscoplasticity constitutive law is applied on both schemes. To confirm the same conditions are adopted on both computational methods, a periodic boundary condition is imposed on Representative Volume Elements(RVEs) in FE simulation. To predict viscoplastic behavior of the composites, the rate sensitivity exponent n is taken to be 10. In the FE analysis, the unit cells are discretized with a hexahedron grid of 64x64x64 elements and in the case of FFT 64x64x64 voxels with a single Fourier point/voxel are used. As a final outcome, stress and strain contours, relative sustainability and activity, stress-strain graph and average behavior of unit cell composites were compared between FE and FFT methods. |
