Peridynamics-Based Digital Image Correlation Algorithm Suitable for Cracks and Other Discontinuities
Publication: Journal of Engineering Mechanics
Volume 141, Issue 2
Abstract
This work presents a novel approach to circumventing the difficulties associated with using digital image correlation (DIC) for problems that involve discontinuities like fracture and fragmentation. The proposed method provides a simple means to combine traditional DIC approaches with peridynamics to achieve full-field displacements, even in the vicinity of cracks. In regions where DIC is accurate and effective, the displacement field is determined using a traditional approach. In discontinuous regions, the displacement field is solved for using peridynamics. This study shows that this method can be used successfully for investigating damage in materials such as nuclear graphite and fiber-RC (FRC). It also shows that the proposed method alleviates nonphysical strains in the vicinity of cracks, common to alternative approaches, which detrimentally degrade the quality of postprocessed quantities of interest such as fracture toughness.
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Acknowledgments
This work was supported by the Institute for Structural Engineering at Stellenbosch University. Their support is gratefully acknowledged. The author thanks Professor Billy Boshoff for providing the images used for the examples related to FRC. The author also thanks Dr. Thorsten Becker for the data related to nuclear graphite and many helpful discussions on this topic. Lastly, Johan Conradie and Matt Molteno are thanked for their assistance in obtaining the experimental results for nuclear graphite. Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. DOE’s National Nuclear Security Administration under contract DE-AC04-94AL85000.
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Published In
Journal of Engineering Mechanics
Volume 141 • Issue 2 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 20, 2014
Accepted: May 29, 2014
Published online: Jul 1, 2014
Published in print: Feb 1, 2015
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