@article{song_peters_2012, title={Self-repairing waveguide sensor with highly repeatable strain response}, volume={8346}, ISSN={["1996-756X"]}, DOI={10.1117/12.914904}, abstractNote={In this article we present experimental demonstrations of a self-writing polymer waveguide strain sensor that can selfrepair after failure. The original sensor is fabricated between two multi-mode optical fibers by ultraviolet (UV) lightwaves in the photopolymerizable resin system via a self-writing process. After the original sensor fails, the repaired sensor is grown from the existing waveguide to bridge the gap between the two optical fibers. Multiple self-repairs of a single sensor were demonstrated. When the sensor was packaged within a polyimide capillary, the cyclic response showed almost no hysteresis and the response over the entire strain range was monotonic.}, journal={SMART SENSOR PHENOMENA, TECHNOLOGY, NETWORKS, AND SYSTEMS INTEGRATION 2012}, author={Song, Young and Peters, Kara}, year={2012} }
 @article{song_peters_2012, title={Self-repairing, interferometric waveguide sensor with a large strain range}, volume={51}, ISSN={["2155-3165"]}, DOI={10.1364/ao.51.006886}, abstractNote={We demonstrate a polymer waveguide, Fabry-Perot interferometer strain sensor fabricated through a self-writing process in a photopolymerizable resin bath between two silica optical fibers. The measurable strain range is extended through sensor self-repair and strain measurements are demonstrated up to 150% applied tensile strain. The sensor fabrication and repair is performed in the ultraviolet wavelength range, while the sensor interrogation is performed in the near-infrared wavelength range. A hybrid sensor is fabricated by splicing a short segment of multimode optical fiber to the input single-mode optical fiber. The hybrid sensor provides the high quality of waveguide fabrication previously demonstrated through self-writing between multimode optical fibers with the high fringe visibility of single-mode propagation. The peak frequency shift of the reflected spectrum Fabry-Perot sensor is extremely linear with applied strain for the hybrid sensor, with a sensitivity of 2.3×10(-3) per nanometer per percent strain. The calibrated peak frequency shift with applied strain is the same for both the original sensor and the repaired sensor; therefore, the fact that the sensor has self-repaired does not need to be known. Additionally, this calibration is the same between multiple sensor fabrications. In contrast to a conventional air gap Fabry-Perot cavity sensor, no decrease in the fringe visibility is observed over the measurable strain range.}, number={28}, journal={APPLIED OPTICS}, author={Song, Young J. and Peters, Kara J.}, year={2012}, month={Oct}, pages={6886–6895} }
 @article{song_peters_2011, title={A self-repairing polymer waveguide sensor}, volume={20}, ISSN={["1361-665X"]}, DOI={10.1088/0964-1726/20/6/065005}, abstractNote={This paper presents experimental demonstrations of a self-repairing strain sensor waveguide created by self-writing in a photopolymerizable resin system. The sensor is fabricated between two multi-mode optical fibers via lightwaves in the ultraviolet (UV) wavelength range and operates as a sensor through interrogation of the power transmitted through the waveguide in the infrared (IR) wavelength range. After failure of the sensor occurs due to loading, the waveguide re-bridges the gap between the two optical fibers through the UV resin. The response of the original sensor and the self-repaired sensor to strain are measured and show similar behaviors.}, number={6}, journal={SMART MATERIALS AND STRUCTURES}, author={Song, Young J. and Peters, Kara J.}, year={2011}, month={Jun} }
 @article{seok_marple_song_gollapudi_charit_murty_2011, title={High temperature deformation characteristics of Zirlo (TM) tubing via ring-creep and burst tests}, volume={241}, ISSN={["0029-5493"]}, DOI={10.1016/j.nucengdes.2010.04.017}, abstractNote={Abstract Fuel cladding tubing acting as a barrier between coolant and radioactive fuel pellets in light water reactors undergo a combination of mechanical and thermal effects along with corrosive conditions during normal operations as well as accident situations, such as LOCA, etc. Therefore, the mechanical integrity of the cladding tubing is of critical importance. In this study, high temperature deformation characteristics of niobium-containing zirconium alloy cladding materials (Zirlo™) have been evaluated via both ring-creep and burst tests. Creep-rupture data are presented in terms of Larson–Miller parameters (LMP). Data (creep rate vs. stress) from ring-creep and burst tests are analyzed, and operating deformation mechanisms are elucidated. This study demonstrates that the hoop creep data obtained from ring-creep and burst tests are equivalent, and one can be replaced with the other, if needed, in order to evaluate creep life.}, number={3}, journal={NUCLEAR ENGINEERING AND DESIGN}, author={Seok, C. S. and Marple, B. and Song, Y. J. and Gollapudi, S. and Charit, I. and Murty, K. L.}, year={2011}, month={Mar}, pages={599–602} }
 @article{song_peters_2011, title={Self-repairing polymer optical fiber sensor}, volume={7753}, ISSN={["1996-756X"]}, DOI={10.1117/12.885147}, abstractNote={This article presents experimental demonstrations of a self-repairing strain sensor waveguide created by self-writing in a photopolymerizable resin system. The sensor fabricates between two multi-mode optical fibers via lightwaves in the ultraviolet (UV) wavelength range and operates as a sensor through interrogation of the power transmitted through the waveguide in the infrared (IR) wavelength range. After failure of the sensor occurs due to loading, the waveguide rebridges the gap between the two optical fibers through the UV resin. The response of the original sensor and the selfrepaired sensor to strain are measured and show similar behaviors.}, journal={21ST INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS}, author={Song, Young and Peters, Kara}, year={2011} }
 @inproceedings{marple_song_gollapudi_murty_charit_2008, title={Stress rupture characteristics of zirconium alloy cladding under closed-end internal pressurization}, ISBN={9780791848142}, DOI={10.1115/icone16-48006}, abstractNote={An understanding of stress rupture behavior of zirconium alloy cladding tubes is of paramount importance for applications in nuclear reactors. Stress rupture properties of recrystallized Zircaloy-4 alloy were evaluated using burst testing of closed-end thin-walled tubing at varied test temperatures and internal pressures. The rupture data are correlated using the Larson-Miller parameter. The uniform circumferential elongations were also measured from which the hoop creep rates were calculated. These results were fitted to Monkman-Grant relationship with the aim of extrapolating the data to in-service stress levels. Furthermore, the creep data were plotted according to the Dorn equation where a transition in deformation mechanism from ‘power-law’ to ‘power law breakdown’ for Zircaloy-4 was noted. TEM studies corroborated the transition in mechanism from the power-law regime to a power-law breakdown regime.}, booktitle={Proceedings of 16th International Conference on Nuclear Engineering-Volume 1}, publisher={New York, NY: ASME}, author={Marple, B. and Song, Y. J. and Gollapudi, S. and Murty, K. L. and Charit, I.}, year={2008}, pages={385–388} }