09:40
40 mins
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APPLICATIONS OF DIGITAL IMAGE CORRELATION METHODS IN EXPERIMENTAL MECHANICS: RECENT EXPERIMENTAL SURFACE MEASUREMENTS AT THE NANO- AND MACRO-SCALES AND WITHIN THE VOLUME FOR HETEROGENEOUS MATERIAL SYSTEMS
Michael Sutton
Abstract: Digital image correlation (DIC) methods were conceptualized in the 1950s within the photogrammetry community, rigorously defined as a two-dimensional full-field method with emphasis on accuracy in 1980s, modified using stereovision concepts for general surface measurements in early 1990s and extended to whole-volume measurements circa 2000. All of these methods came of age in the new millennium as computer technology advanced and processing speed increased by more than 106; subset matching speeds for 21x21 subsets exceed 10,000/sec in some implementations . This presentation will briefly summarize the history of DIC methods before presenting a series of experimental studies. In the first study, recent developments at the micro-scale and nano-scale are presented, with special emphasis on DIC measurements using a scanning electron microscope for imaging extremely small regions on heterogeneous specimens subjected to elevated temperatures. In the second study, recent volumetric imaging strain measurements from a specially designed and manufactured nylon fiber-epoxy composite specimen are presented. Finally, a recent large-scale study on pre-stressed concrete beams is presented to demonstrate the broad applicability and potential measurement limitations of the method for structural studies.
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