Dynamic Visualization of Stress Distribution by Mechanoluminescence Image

Li, Chen Shu; 徐, 超男; Zhang, Lin; Yamada, Hiroshi; Imai, Yusuke; Wang, Wen Xue

doi:10.4028/www.scientific.net/kem.388.265

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…In the following sections, we review recent work on applications of ML materials to map stress distributions in damaged structures, in components of dynamic machines [7,16], and in living systems, including studies on the stress distribution of artificial bone during the application of compressive loads [22]. Also, we directed to the following publications for discussions on other image-based applications of ML [160,173,209,227,229,[290][291][292][293][294][295].…”

Section: Imaging Stress Distributionsmentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

263

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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Section: Imaging Stress Distributionsmentioning

confidence: 99%

Trap-controlled mechanoluminescent materials

Zhang

Wang

Marriott

et al. 2019

Progress in Materials Science

263

196

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“…Only few papers are related to the investigation of EML and PML. The papers related to the studies of EML and PML are: .…”

mentioning

confidence: 99%

Survey of the literature on mechanoluminescence from 1605 to 2013

2014

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Mechanoluminescence (ML) is a type of luminescence induced by any mechanical action on solids. The light emissions induced by elastic deformation, plastic deformation and fracture of solids are called elastico ML (EML), plastico ML (PML) and fracto ML (FML), respectively. Whereas nearly 50% of all organic molecular solids and inorganic salts exhibit FML, only a few solids exhibit EML and PML. The EML and FML of certain solids are so intense that they can be seen during daylight with the naked eye. Mechanolumnescence has a great potential for use in different types of mechano-optical devices such as stress sensors, damage sensors, impact sensors, fracture sensors and safety management monitoring systems. This article reports a survey of the literature from 1605 to 2013. Mechanoluminescence is studied by physicists, chemists, material scientists, geologists, medical scientists, engineers and technologists, among others and researchers will certainly benefit from the literature survey on ML given here. In addition, the field of mechanoluminescence may attract the interest of many new researchers.

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“…Case II.EML induced by the stress initially increasing and then decreasing with time For the increasing portion of pressure, I m and I T are given by Eqs. (18) and (27), respectively.For the decay of EML intensity after t m , the following two conditions arise: (i) occurrence of the detrapping in the localized piezoelectric region during the decay of piezoelectric charge, and (ii) occurrence of the EML decay from the filled shallow traps lying in the normal piezoelectric region of the crystals.…”

Section: (Iv) Estimation Of I M and I Tmentioning

confidence: 99%

“…So far the most promising elastico mechanoluminescent materials are rare-earth doped alkaline aluminates and the transition metal ion doped zinc sulphide. In recent years, significant experimental studies have been made and remarkable upgrading in the intensity of elastico ML has been achieved in the SrAl 2 O 4 doped with europium by controlling the lattice defects in the material [6][7][8][9][10][11][12][13][14][15][16][17][18]. Significant enhancement in the EML intensity of ZnS:Mn nanocrystals has also been achieved by improving their crystallinity [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Mechanoluminescence of Nanoparticles

Chandra¹

2011

TONANOJ

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Certain nanoparticles exhibit intense light emission during their elastic deformation, called the phenomenon of elastico mechanoluminescence (EML).When ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles are deformed in the elastic region by the stress initially increasing with time and then attaining a fixed value or by the stress initially increasing and then decreasing with time or by the impact stress, then after a threshold pressure, initially the EML intensity increases with time, attains a maximum value and later on it decreases with time. For the fixed pressure or slowly decreasing pressure, the slow decay time of EML is equal to the lifetime of electrons in the shallow traps lying in the normal piezoelectric region of the crystals.In these cases, sometimes, fast decay of EML also appears and it is related to the machine-constant, that is, the decay time of strain-rate after the power to the cross-head of the machine is switched off. For the fast-deformation caused by impact stress, the fast decay time of EML is controlled by the rise time of impact stress, and the slow decay of EML gives the lifetime of retrapped electrons in the shallow traps. For ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles, the total EML intensity increases quadratically with the applied pressure. The diminished EML intensity of SrAl 2 O 4 :Eu nanoparticles caused by number of pressings can be recovered by exposing the sample to UV-radiation. The tribo ML of ZnS:Mn nanoparticles increases with increasing value of the load placed on the rotating rod inducing tribo ML. The EML spectra of ZnS:Mn and SrAl 2 O 4 :Eu nanoparticles are similar to their photoluminescence and electroluminescence spectra. The piezoelectrically-induced detrapping model is found to be suitable for the EML of nanoparticles and the expressions derived on the basis of this model are able to explain successfully the characteristics of the EML of nanoparticles. The EML of nanoparticles has been found useful in stress sensor and an EML-based safety-management monitoring system has been developed. The EML of nanoparticles can be used for the visualizations of stress distribution in solids, stress field near crack-tip, quasidynamic crack-propagation in solids and internal defect in a pipe. The EML intensity of nanoparticles is so intense that it is able to drive a solar cell system and it can be used as a light-source for specific applications. Furthermore, several parameters of nanoparticles can be determined from their EML measurements.

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Dynamic Visualization of Stress Distribution by Mechanoluminescence Image

Cited by 11 publications

References 12 publications

Trap-controlled mechanoluminescent materials

Trap-controlled mechanoluminescent materials

Survey of the literature on mechanoluminescence from 1605 to 2013

Mechanoluminescence of Nanoparticles

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