Hansohl Cho

Phase-separated segmented copolymers comprised of hard and soft segments can be tailored to offer hybrid mechanical performance including a highly dissipative yet resilient large strain behavior. The phase-separated morphology provides multiple relaxation processes which lead to a rate-dependent stress–strain behavior with a transition in rate sensitivity. In addition to the viscoelastic–viscoplastic dissipation pathways, stretch-induced softening due to microstructural breakdown provides a sign

This work demonstrates how the geometric and topological characteristics of substructures within heterogeneous materials can be employed to tailor the mechanical responses of soft crystals under large strains. The large deformation mechanical behaviors of elastomeric composites possessing long‐range crystalline order are examined using both experiments on 3D‐printed prototype materials and precisely matched numerical simulations. The deformation mechanisms at small and large strains are elucidat

. Moreover, we investigate the complexity of elastic and inelastic "unloading" mechanisms crucial for the understanding of shape recovery and energy dissipation in extreme loading situations. Furthermore, we propose a simple but physically intuitive approach for designing microstructures that exhibit a nearly isotropic behavior in both elasticity and inelasticity across different crystallographic orientations from small to large strains. Overall, our study sets a significant step toward the deve

Highly stretchable elastomeric materials often exhibit size-dependent, nonlocal features in damage and fracture processes. This study investigates the nonlocal fracture behavior in a broad variety of elastomers which display moderate to extreme stretchability by means of experiments and numerical simulations. The authors highlight that the experimentally observed size-dependent fracture is accurately described by a nonlocal continuum model that makes use of an intrinsic length scale associated w

Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.