Mechanical Engineering Graduate Seminar: Stephen Holland
Feb 14, 2019
03:30 PM - 04:20 PM
103 South Capitol Street, Iowa City, IA 52240
Title: Using Heat to See into Structures: Thermography for Non-Destructive Evaluation
Presented by Dr. Stephen Holland, PhD
Associate Professor, Department of Aerospace Engineering
Iowa State University
Abstract: Non-destructive evaluation is needed to verify the structural integrity of safety-critical structures. Thermography is the use of thermal imaging cameras to measure surface temperature. Energy applied to the structure creates contrast that can be related to internal features. Flash thermography uses a pulse of light to find discontinuities in the structure. We discuss how modeling of the heat flows allows internal structure such as delaminations in composite materials to be identified. Vibro-thermography is a related method for nondestructive evaluation that uses vibration as the energy source. The vibration causes crack surfaces to rub, generating heat which is detected with a thermal camera. We discuss the vibration and crack heating mechanisms and how modeling leads to better understanding of what sorts of cracks or other damage can be found.
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Individuals with disabilities are encouraged to attend all University of Iowa–sponsored events. If you are a person with a disability who requires a reasonable accommodation in order to participate in this program, please contact in advance at