Material Characterization Beyond Limit
CME Department Seminar
February 28, 2025
11:00 AM - 12:00 PM America/Chicago
Presenter: Jungsub Lee, Postdoctoral Fellow, University of Illinois Chicago
Location: ERF Room 1047
Abstract: Material characterization is a fundamental activity to evaluate the properties of material and understand the material behavior. The characterization process can be as simple as a single indentation for hardness measurement, or as complex as evaluating crack propagation under triaxial stress states. In any cases, the purpose of material characterization is always the application of material properties/characteristics to achieve better understanding of material itself or mechanical components. The extended perspective toward extreme physical domain, i.e., temperature, time, and length, is demanding advanced material characterization technics to explore material behaviors in broader areas. In this talk, case studies including metal fatigue up to 1010 cycles, rubber elasticity, and their application to virtual product development will be introduced. Firstly, a unique fatigue test machine utilizing ultrasonic resonance will be presented. The elasticity principles to induce controlled vibration to the system and signal processing technics for high precision measurement will be covered. Test results from the newly developed fatigue test system showcase the accessibility in undiscovered regime by comparing the results with conventional test methods. The second example will focus on hyperelastic behaviors of soft materials and property modeling. The non-linear mechanical behavior of rubbers captured by digital image correlation (DIC) technic will be introduced and design strategy in applying hyperelastic materials will be discussed.
Speaker Bio: Jungsub Lee is a postdoctoral fellow at the department of Civil, Materials, Environmental engineering, University of Illinois Chicago. Dr. Lee completed his PhD in mechanical engineering at Korea University where he focused on evaluating fatigue behaviors of metals and mechanical components. His research interests are experimental mechanics including very high cycle fatigue behaviors of metals, hyperlasticity of soft materials, and structure property relationship of advanced engineering materials. He is currently collaborating with industry partners (Hyundai Motors and LG electronics) and department faculty (Prof. Daly, Ozevin, and Chudnovsky).
Date posted
Feb 20, 2025
Date updated
Feb 20, 2025