I am a Ph.D. candidate in mechanical engineering at the University of Michigan. I conduct research under the guidance of Professor Jon Estrada in the Experimental Soft Mechanics Lab.
My research broadly explores the continuum-scale mechanics of solids and structures undergoing large deformation. I enjoy combining classical theory, variational and reduced-order modeling, and carefully verified finite-element simulations to establish when simple mechanics models remain useful—and how they should be extended when their assumptions fail. My computational toolkit includes Wolfram Mathematica, Abaqus, and, increasingly, the open-source variational finite-element framework FEniCSx.
My current projects aim to strengthen the theoretical and computational foundations of inertial microcavitation rheometry (IMR), which probes soft materials at strain rates exceeding 106/s, and magnetic resonance cartography (MR-u), which combines three-dimensional displacement measurements and the virtual fields method for hyperelastic material identification. I also examine how classical experiments, such as spherical indentation and cavity inflation, can be adapted and rigorously validated to characterize materials with nonlinear, rate-dependent, and spatially varying properties.
During the COVID pandemic, I created and continually maintained the Twitter series #DailyMechanician. Through this science communication project, I shared stories about how the field of mechanics evolved and how mechanicians developed clever solutions to challenging problems. The series has been on pause since 2024, shortly after Twitter was rebranded and I became a parent. However, I remain deeply enthusiastic about the history of science, mathematics, and engineering, and I firmly believe in the value of humanizing the people behind important equations and landmark papers.
zhiren at umich.edu
Department of Mechanical Engineering
University of Michigan
Ann Arbor, MI