| 초록 |
In this presentation, composite microstructures are digitally generated where hard bcc particles are placed in soft fcc matrix randomly a little bit off from the regular simple cubic grid points. Then, their micromechanical responses to a tension are predicted using a fast fourier transform based viscoplasticity. Moreover, the results are compared to the baseline cases, i.e., those from the composites with regularly positioned particles at simple cubic, body centered cubic and face centered cubic grid points (SCGP, BCCGP, FCCGP, respectively). The reason that only the particles from SCGP case are position-perturbed is because its mechanical response is drastically different from those in BCCGP and FCCGP cases, while BCCGP and FCCGP cases are show a similar mechanical behavior. In a nutshell, we want to attribute the big difference to the geometric features of the microstructures. We found that the stress and strain-rate fields were not only functions of volume fraction and contiguity of particles, but also regularity of the position of particles. These are found to be mainly due to the morphological difference in the matrix phase and development of paths with high strain-rate values. |
