기계공학부 구성원들의 많은 관심과 참여 부탁드립니다.

▣ 주   제: Engineered disorder for isotropic, extreme resilience and dissipation

▣ 연   사: 조한솔 교수

▣ 소   속: KAIST 항공우주공학과

▣ 일   시: 2023. 12. 4.(Mon) 16:00

▣ 장   소: 제4공학관 D406호

▣ 초   청: 홍종섭 교수

▣ 초   록

Heterogeneous materials architected on various crystal lattices have been widely explored for photonics, acoustics and mechanics with the recent advances in additive manufacturing across a broad range of length-scales. Long-range order in the heterogeneous materials architected on crystal lattices often results in undesirable, intrinsic anisotropy. In this work, we present a simple yet physically intuitive design strategy on disordered microstructures that exhibit near-complete isotropy in both elasticity and inelasticity. We fabricated prototypes for the disordered microstructures with dispersed-particle and interpenetrating morphologies using a multi-material 3D printer and performed large strain mechanical tests on the 3D-printed prototypes. Altering the connectivity throughout random spatial points was found to impact significantly on key elastic and inelastic features in extreme loading scenarios. Furthermore, our experiments and numerical simulations revealed that the interpenetrating morphology with a “finite” number of random spatial points exhibited “near-complete” isotropy at small to large strains. Overall, our findings show that the interpenetrating morphology via a disordered network holds great promise for the design of heterogeneous materials with isotropic shape recovery and energy dissipation in extreme settings.