Abstract
In this work, the reflection-mode Digital Gradient Sensing (r-DGS) method is extended for visualizing and quantifying crack-tip deformations in solids under quasi-static and dynamic loading conditions. The r-DGS technique employs digital image correlation principles to quantify two orthogonal surface slopes simultaneously in specularly reflective solids by quantifying small deflections of light rays. For the first time, r-DGS has been implemented here to study both mode-I and mixed-mode (I/II) problems and quantify fracture parameters. Under dynamic loading conditions, r-DGS is implemented in conjunction with high-speed digital photography to map surface slopes in edge cracked plates subjected to one-point impact. The measured surface slopes have been used to successfully evaluate stress intensity factor histories by pairing measurements with the corresponding asymptotic crack tip field descriptions using overdeterministic least-squares analyses.
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References
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Acknowledgments
The partial support for this research through grants from the National Science Foundation (grant #1232821) and Department of Defense (grant # W31P4Q-14-C-0049) are gratefully acknowledged.
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© 2016 The Society for Experimental Mechanics, Inc.
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Jain, A.S., Tippur, H.V. (2016). Reflection-Mode Digital Gradient Sensing Technique for Experimental Fracture Mechanics. In: Beese, A., Zehnder, A., Xia, S. (eds) Fracture, Fatigue, Failure and Damage Evolution, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-21611-9_1
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DOI: https://doi.org/10.1007/978-3-319-21611-9_1
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-21610-2
Online ISBN: 978-3-319-21611-9
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