Digital Image Correlation in Composite Testing
Speaker: Matthias Merzkirch, Research Institutes of Sweden (RISE)
Date: Monday, May 15, 2023
Time: 11:00am – 12:00pm
Location: NIA, Room 137 or via Teams link
Abstract
The seminar describes application of Digital Image Correlation (DIC) for selected standardized tests for the mechanical characterization of advanced fibrous composite laminates under quasi-static loading in general-purpose laboratory conditions. A general overview with a focus on DIC standardization and DIC measurement uncertainty will be presented. Metrological sensitivity analyses, i.e., DIC-related measurement uncertainty, are shown in terms of the potential testing bias. A methodology for investigation of (spatial) variance (noise-floor) and bias errors with respect to the DIC analysis parameters such as subset, step, and window size – parameters of the virtual strain gauge (VSG) – is exemplarily presented in several process steps to optimize the DIC measurements. The aim of this virtual strain gauge study is to find a convergence, or a compromise, between noise and strain gradient, representing an appropriate signal-to-noise ratio. Furthermore, the application of DIC for delamination resistance testing with emphasis on Mode I Double Cantilever Beam (DCB) testing and an outlook on Mode II End-Notched Flexure (ENF) and Calibrated End-loaded Split (C-ELS) testing will be presented.
Bio
Dr.-Ing. Matthias Merzkirch is a senior scientist at Research Institutes of Sweden (RISE). He was a guest researcher at the National Institute of Standards and Technology (NIST), a postdoc at the Karlsruhe Institute of Technology (KIT, Germany) where he earned his PhD in mechanical engineering, and a guest lecturer at the Karlsruhe University of Applied Sciences (HKA) and KIT. As a member of the International Digital Image Correlation Society (iDICs), he is active in a committee dedicated to standardization.
Have questions?
Mary Catherine Bunde
Senior Education Administrator
National Institute of Aerospace
mary.bunde@nianet.org