Joseph Peterson
University of California-Los Angeles, CA·Engineering·Early-career
We often judge a material by how it responds when we poke, stretch or squeeze it. In industry and research, from polymer recycling to 3D printing, scientists measure how materials respond to repeated back-and-forth deformation to predict how they will perform.
- Fields
Engineering
Materials Science
Physics
- Topics
rheology
entangled polymers
complex fluids
- Grants
- 1 known grant, through Dec 2029
What they work on
- Extend parallel superposition rheology to Large Amplitude Oscillatory Shear flows to fully characterize an entangled polymer's linear response to small disturbances about a base deformation cycle, expressed as a harmonic transfer matrix.
- Formalize and validate the harmonic transfer matrix as a way to predict shear banding instabilities in oscillatory flow, combining theory, computation and experiments.
- Develop frameworks for quantitative material characterization from LAOS data, and explain how the bifurcation structure of shear banding differs between steady and oscillatory shear.
More about the research
Yet there is no universal way to interpret these tests. This project aims to show that systematically adjusting the deformation cycle, and analyzing how the response changes, can reveal new information about how materials behave.
Why it matters
Better ways to interpret oscillatory shear tests could help manufacturers predict how polymers and gels will behave during processing such as polymer recycling and 3D printing, and anticipate flow instabilities. The analysis tools may also carry over to signal processing, process control and electrical circuits, where similar push-and-pull tests are used.
Known grants
From NIH and NSF research grants. Labs often have other funding we can't see.
Closest labs
Chang Liu
University of Connecticut, CT·Engineering·Early-career
Develop nonlinear stability analysis based on Lyapunov theory for channel flows with periodic, non-periodic and unknown time dependence, where methods based on linearization or steady flow fail.
Chongchun Zeng
Georgia Institute of Technology, GA·Mathematics & Statistics
Analyze two-dimensional water waves linearized at shear flows, where speed varies with depth, establishing the bifurcation of instability and linear inviscid damping for gravity water waves.
Xiaoyu Tang
Northeastern University, MA·Engineering·Early-career
Build an experimental platform that combines several advanced diagnostic methods to resolve flow, stress and particle concentration inside complex-fluid droplets as they hit surfaces, including opaque particle suspensions.
The school
University of California-Los Angeles: 84 labs on PI Pages, $1.9B a year on research, 803 research doctorates a year.
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