Quasi-Dynamic Visualization of Crack Propagation and Wake Evolution in Y-TZP Ceramic by Mechano-Luminescence

Kim, J. S.; Koh, H.J.; Lee, W. D.; Shin, Namsoo; Kim, J. G.; Lee, K. H.; Sohn, Kee‐Sun

doi:10.3365/met.mat.2008.04.16

Cited by 24 publications

(13 citation statements)

References 14 publications

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“…The theoretical calculation agrees well with the stress distribution contour obtained from the ML intensity [20]. With the help of a high speed camera (8000 fps), the quasi-dynamic materials resistance curve ( R -curve) of zirconia polycrystals can be measured for crack speeds up to 15 m/s [18]. This method illustrates the feasibility of visualizing and calculating static stress field from ML materials and can even be extended to dynamic conditions.…”

Section: Proven and Potential Applicationssupporting

confidence: 63%

“…Based on the linearity between ML intensity and stress, the stress distribution of a composite under compression [12], tensile load [13], torsion [14,15], ultrasound radiation [16] or vibration due to gas flow [17] has been estimated by this ML-based method. The stress field and wake in the vicinity of a crack [18,19], and its propagation [20,21] can also be visualized in an in situ manner thanks to ML phosphors. Recent reports showed that ML materials are able to emit light upon applying electric [13] or magnetic [22] fields when they are properly coupled with piezoelectric crystals (magnetic alloys).…”

Section: Introductionmentioning

confidence: 99%

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A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

2018

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Mechanoluminescence (ML) is the non-thermal emission of light as a response to mechanical stimuli on a solid material. While this phenomenon has been observed for a long time when breaking certain materials, it is now being extensively explored, especially since the discovery of non-destructive ML upon elastic deformation. A great number of materials have already been identified as mechanoluminescent, but novel ones with colour tunability and improved sensitivity are still urgently needed. The physical origin of the phenomenon, which mainly involves the release of trapped carriers at defects with the help of stress, still remains unclear. This in turn hinders a deeper research, either theoretically or application oriented. In this review paper, we have tabulated the known ML compounds according to their structure prototypes based on the connectivity of anion polyhedra, highlighting structural features, such as framework distortion, layered structure, elastic anisotropy and microstructures, which are very relevant to the ML process. We then review the various proposed mechanisms and corresponding mathematical models. We comment on their contribution to a clearer understanding of the ML phenomenon and on the derived guidelines for improving properties of ML phosphors. Proven and potential applications of ML in various fields, such as stress field sensing, light sources, and sensing electric (magnetic) fields, are summarized. Finally, we point out the challenges and future directions in this active and emerging field of luminescence research.

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Section: Proven and Potential Applicationssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

2018

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“…Several studies have reported applications of ML imaging techniques to visualize and track high-speed crack propagation in engineered materials (15-250 m s −1 ) [231,232,296,[327][328][329][330][331][332][333][334][335], i.e., far faster than those recorded using conventional crack monitoring techniques (10 −3 -10 −2 m s −1 ) [336][337][338]. For example, Sohn et al coated a thin film harboring SrAl 2 O 4 :Eu 2+ ,Dy 3+ particles to the surface of test samples, and imaged crack propagation during their fracture by using a sensitive high-speed camera [296].…”

Section: Visualization Of Crack Propagation 731 Fast-moving Crack mentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

255

196

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Mechanoluminescence (ML) is generated during exposures of certain materials to mechanical stimuli. Many solid materials produce ML during their fracturing, however, the irreversibility of fracto-induced ML limits the practical applications of these materials. In 1999, Chao-Nan Xu discovered an intense and reproducible ML from trap-controlled materials, including ZnS:Mn 2+ and SrAl 2 O 4 :Eu 2+ , and introduced the principles and applications of hybrid inorganic/organic mechanoluminescent (ML) composites, and related sensors to visualize stress/strain in target structures. This discovery has triggered intense research interest in trap-controlled ML materials and composites over the past 2 decades. Notable achievements of this research include the development of trap-controlled materials that exhibit bright ML emission from the ultraviolet to the near infra-red, and multiscale mechano-optical sensitivities. This research has also increased our understanding of the mechanisms of ML phenomena, enabling the rational design of trap-controlled ML materials. Practical applications of ML are also being driven by the discovery that ML composites can serve as "mechano-optical sensitive skin" for structural health diagnosis, stress sensors for biomechanics, and mechanically-activated light sources. This review focuses on the design, synthesis, characterization, optimization and application of trap-controlled ML materials, and concludes with discussions on future directions of ML research and specific challenges to improve ML materials for real-world applications.

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“…To date, the most promising elasticomechanoluminescence (EML) materials are rare-earth doped alkaline aluminates and the transition metal ion-doped zinc sulfide. In recent years, significant experimental advances have been made and remarkable upgrades in the intensity of elastico-ML in SrAl 2 O 4 doped with europium have been achieved by controlling lattice defects in the materials (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Significant enhancement in the elastico-ML intensity of ZnS: Mn nanocrystals has also been achieved by improving their crystallinity (16)(17)(18)(19)(20)(21).…”

Section: Introductionmentioning

confidence: 99%

Mechanoluminescence of SrAl₂O₄:Eu,Dy nanophosphors induced by low impact velocity

Jha

Chandra

2016

Luminescence

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The present paper reports the impulsive excitation of mechanoluminescence (ML) in Sr Al O :Eu ,Dy nanophosphors prepared using a combustion technique. The phosphors are characterized using X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and photoluminescence (PL). The XRD results show that the samples exhibit a monoclinic α-phase in the crystal structure. The space group of SrAl O :Eu,Dy nanophosphors is monoclinic P2 . The PL and ML spectra of SrAl O :Eu,Dy nanophosphors are excited using light with a wavelength of 365 nm and emission is found at 516 nm. The prepared nanophosphors exhibits an intense ML that can be seen in daylight with the naked eye. When a sample powder is deformed impulsively by the impact of a moving piston, the ML intensity initially increases linearly with time, attains a peak value, I , at time t , and then decreases with time. The peak ML intensity, I , and total ML intensity, I , increase linearly with applied pressure and impact velocity. The ML intensity decreases with successive impacts of load onto the phosphors, and the diminished ML intensity can be approximately recovered by UV irradiation. The activation energy using thermoluminescence is found to be 0.57 eV for SrAl O :Eu,Dy nanophosphors. Copyright © 2016 John Wiley & Sons, Ltd.

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Quasi-Dynamic Visualization of Crack Propagation and Wake Evolution in Y-TZP Ceramic by Mechano-Luminescence

Cited by 24 publications

References 14 publications

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

Trap-controlled mechanoluminescent materials

Mechanoluminescence of SrAl₂O₄:Eu,Dy nanophosphors induced by low impact velocity

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Quasi-Dynamic Visualization of Crack Propagation and Wake Evolution in Y-TZP Ceramic by Mechano-Luminescence

Cited by 24 publications

References 14 publications

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

A Review of Mechanoluminescence in Inorganic Solids: Compounds, Mechanisms, Models and Applications

Trap-controlled mechanoluminescent materials

Mechanoluminescence of SrAl2O4:Eu,Dy nanophosphors induced by low impact velocity

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Product

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Mechanoluminescence of SrAl₂O₄:Eu,Dy nanophosphors induced by low impact velocity