Abstract
Layered specimens can, and often do, have discontinuities in residual stress across the material interfaces. Stress discontinuities internal to specimens are notoriously difficult to measure, yet they can have profound impact on debonding and other failures. The incremental slitting method, also known as crack compliance, is generally excellent at resolving stress profiles even when there are high gradients. However, the data reduction for slitting usually involves some smoothing, which makes it hard to resolve discontinuities. In this work, we start with a recent technique to analyze slitting data using Tikhonov regularization, and extend that technique to allow stress discontinuities at material interfaces. The new method is then demonstrated experimentally on several specimens, including metals and ceramics.
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Notes
- 1.
See [14] for general formulas for unevenly spaced intervals.
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Acknowledgments
This work was performed at Los Alamos National Laboratory, operated by the Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. The authors would like to acknowledge the financial support of the US Department of Energy- National Nuclear Security Administration’s Global Threat Reduction Initiative’s Reactor Conversion program.
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Prime, M.B., Crane, D.L. (2014). Slitting Method Measurement of Residual Stress Profiles, Including Stress Discontinuities, in Layered Specimens. In: Rossi, M., et al. Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00876-9_12
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