Mapping linear viscoelasticity for design and tactile intuition
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Nonlinear rheological properties are often relevant in understanding the response of a material to its intended environment. For example, many gastropods crawl on a thin layer of pedal mucus using a technique called adhesive locomotion, in which the gel structure is periodically ruptured and reformed. We present a mechanical model that captures the key features of this process and suggests that the most important properties for optimal inclined locomotion are a large, reversible yield stress, followed by a small shear viscosity and a short thixotropic restructuring time. Adhesive locomotion of snails or mechanical crawlers imposes a large-amplitude pulsatile simple shear flow onto the supporting complex fluid, motivating the characterization of nonlinear rheological properties with large amplitude oscillatory shear LAOS. We represent our results in the form of Lissajous curves of oscillatory stress against time-varying strain.
Randy H. Ewoldt: Experimental Challenges of Shear Rheology, How to Avoid Bad Data
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The HML has approximately 30 graduate students doing research in it at any given time. The breadth of fields is immense, from classic fluid mechanics to computational fluid dynamics to many projects involved in bio-engineering. Students come from across the world to study in this lab, at both the master's and doctoral level. Here is an alphabetical list of the current students, as well as some of our recent graduates. Suraj Deshmukh.