| 초록 |
We studied the microstructure-mechanical fields relationship using a viscoplasticity simulation method based on the Fast Fourier Transform (FFT) method. As input microstructure, hypothetical two-phase materials, composed of spherical particles on the regular gridded points (simple cubic (SC), face centered cubic (FCC), and body centered cubic (BCC)) and single-crystalline matrix phases, were generated up to the prescribed the volume fraction of particles using the in-house codes. Then hard BCC crystalline properties, crystal slip systems and Taylor factor, were assigned to particle phase, while soft FCC properties to matrix phase. A uniaxial tension is applied to the input microstructure and its viscoplastic response was investigated using the image-based Fast Fourier Transform (FFT) method. As a result, we measured the stress and strain-rate field and performed hot-spot analysis, hot-spot shape and spatial distribution, and its variation as the position of the particles vary. Using the results, one can decide which microstructure has more desired property fields than the others. |
