Surface Morphology in Soft Materials: From Fundamental Mechanics to Material Design
报告题目：Surface Morphology in Soft Materials: From Fundamental Mechanics to Material Design
Biography: Ruike Zhao, Ph.D. is a postdoctoral fellow in Department of Mechanical Engineering at MIT. Her research focuses on soft material behavior with an emphasis on bio-mechanics and intelligent material design. A particular area of her current research is to develop theoretical and computational models to understand the bio-growth induced surface instabilities for artificial tissue design. Ruike received her Ph.D. in solid mechanics from Brown University, under the guidance of Kyung-Suk Kim and Huajian Gao. During her Ph.D., Ruike built the finite element models to systematically understand the morphological instabilities on soft material surface and developed the material constitutive model for multi-fiber-reinforced anisotropic material. She pioneered the material design strategy in soft structural systems for biological applications and advanced soft composite materials.
Surface Morphology in Soft Materials:
From Fundamental Mechanics to Material Design
Postdoctoral Research Associate, Department of Mechanical Engineering,
Massachusetts Institute of Technology, Cambridge, MA
Soft materials are central to biological systems as well as many advanced technological devices such as flexible electronics and soft robotics. The surface morphology of soft material systems determines the functionality of the system and its response to external stimuli. As an example, ageing-induced brain sulci degeneration triggers Alzheimer’s disease and other functionality losses. Nature uses soft material interface morphologies as a strategy to assemble materials with remarkable fracture and dynamic loading resistance. These structural arrangements are found at the microscopic level and even at the nanoscale level. The well-known nacre with high fracture toughness has a composite structure of hard aragonite and tough protein, and its assembly includes complex hierarchical microarchitecture.
What are the factors that control morphological patterning in a soft material? How does the patterning relate to material functionality? How can we learn from nature-designed materials and create novel materials with extraordinary properties? The answers to these questions not only advance the fundamental studies of mechanics and materials, but also create new directions to address challenges in health, energy, environment, and many other fields. In this talk, I will discuss the linear perturbation method to solve the instability problem for critical conditions to trigger morphological pattering in soft materials. FEM is used to investigate post-buckling evolution and experimental validation is carried to support the calculations. I will show how theory and simulation can be used to predict soft material behavior and enable design optimization of advanced materials. I will close with a discussion on future perspectives on soft material composites and devices design.