Mechanoluminescent determination of the mode I stress intensity factor in SrAl2O4:Eu2+,Dy3+

Timilsina, Suman; Lee, Kwang Ho; Jang, Il‐Young; Kim, Ji Sik

doi:10.1016/j.actamat.2013.08.024

Cited by 63 publications

(46 citation statements)

References 33 publications

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“…Meanwhile, the rate‐equation model for the loading‐rate‐dependent ML and the cyclic loading phenomenon of SAO have been established, which are helpful for understanding the mechanism of ML. Based on previous research advancements, a novel optical technique to determine the mode I static SIF of an arrested crack using ML has been developed recently . In the research, the static stress‐field rates and their cumulative isostress contour patterns in the vicinity of the arrested crack tip during stable compact tension (CT) were successfully evaluated by ML on the basis of the deviator stress criteria in triggering the trap‐releasing process.…”

Section: Introductionmentioning

confidence: 99%

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺

et al. 2015

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New theoretical solutions involving conventional crack propagation from static to dynamic fracture in terms of mechanoluminescence (ML) and the experimental techniques to trace the in situ crack and its instantaneous stress intensity factor (SIF) have been suggested in SrAl2O4:Eu2+, Dy3+ (SAO). The direct optical method to determine the moving crack tip on behalf of ML was verified by indirect crack mouth opening displacement (CMOD). The mode I SIF KIML calculated from the instantaneous cumulative ML fringes showed proper agreement with the SIFs KnormalInormalanormalML and KnormalInormalafalse(normalCMODfalse) acquired from conventional ASTM E‐399 measurements under quasidynamic condition. The magnitude and shape of the theoretically predicted crack tip stress field was in accordance with the experimental in situ ML evidence while determining the quasidynamic SIF from the cumulative ML intensity. Therefore, the use of ML technology could be one of the possible substitutive and substantial alternatives for structural health monitoring systems due to its simplicity but effectiveness in detecting arrested or propagating crack tips and in assessing the instantaneous structural integrity by means of the ML fracture parameters.

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Section: Introductionmentioning

confidence: 99%

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺

et al. 2015

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“…In the first mode (pure opening mode), crack surfaces move directly apart and the SIF is denoted by

K_{I}

. Timilsina et al have explored the possibility of calculating

K_{I}

from the emission of ML materials coated on stainless steel under compact tension [19]. The instantaneous ML intensity is shown in Figure 17a, and contours were constructed in Figure 17b accordingly.…”

Section: Proven and Potential Applicationsmentioning

confidence: 99%

“…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%

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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“…Therefore, in the present study, we try to build SrAl 2 O 4 nanostructures by microwave method. Also, SrAl 2 O 4 can dope with rare earth elements (e.g., Eu, Yb, Cr and Dy) as the activator and coactivator and employ as the matrix material (Timilsina et al 2013;Teng et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Green and microwave synthesis of SrAl2O4 nanoparticles by application of pomegranate juice: study and characterization

2017

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In the present paper, a green method was applied for the synthesis of SrAl 2 O 4 nanostructures with the aid of microwave irradiation and pomegranate juice. SrAl 2 O 4 nanocrystals were obtained when the raw materials were irradiated with 720-900 W for 6-10 min and then calcinated at 550°C for 5 h. Using pomegranate juice as a dispersion and stabilizing agent, SrAl 2 O 4 nanoparticles have been made with better properties in view of morphology and particle size. Also, the effect of some parameters affecting synthesis process such as microwave power and reaction time on the morphology and particle size of product was studied and optimized. X-ray diffraction and field emission-scanning electron microscopy were used to study and characterize the manufactured SrAl 2 O 4 nanoparticles.

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Mechanoluminescent determination of the mode I stress intensity factor in SrAl2O4:Eu2+,Dy3+

Cited by 63 publications

References 33 publications

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺

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

Green and microwave synthesis of SrAl2O4 nanoparticles by application of pomegranate juice: study and characterization

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Mechanoluminescent determination of the mode I stress intensity factor in SrAl2O4:Eu2+,Dy3+

Cited by 63 publications

References 33 publications

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl2O4:Eu2+, Dy3+

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl2O4:Eu2+, Dy3+

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

Green and microwave synthesis of SrAl2O4 nanoparticles by application of pomegranate juice: study and characterization

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Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺

Optical Evaluation of In Situ Crack Propagation by Using Mechanoluminescence of SrAl₂O₄:Eu²⁺, Dy³⁺