Mechanoluminescence technique for real-time monitoring of cracks produced during application of loads on crystals

Chandra, B P; Mahobia, S K; Nema, S K; Jha, P; Kuraria, R K; Kuraria, S R

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Please use this identifier to cite or link to this item: http://nopr.niscpr.res.in/handle/123456789/7613

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DC Field	Value	Language
dc.contributor.author	Chandra, B P	-
dc.contributor.author	Mahobia, S K	-
dc.contributor.author	Nema, S K	-
dc.contributor.author	Jha, P	-
dc.contributor.author	Kuraria, R K	-
dc.contributor.author	Kuraria, S R	-
dc.date.accessioned	2010-03-11T07:15:58Z	-
dc.date.available	2010-03-11T07:15:58Z	-
dc.date.issued	2010-02	-
dc.identifier.issn	0975-1017 (Online); 0971-4588 (Print)	-
dc.identifier.uri	http://hdl.handle.net/123456789/7613	-
dc.description	61-66	en_US
dc.description.abstract	When a load is applied on to a crystal, then the fracto- mechanoluminescence (ML) emission takes place in the form of light pulses. The number of ML pulses and the time duration t_c for the appearance of ML increase with increasing value of the load and the average ML intensity from a single ML pulse decreases with increasing value of the load. For a given value of the applied pressure, the total number N_Tof ML pulses, the total ML intensity I_T and the time duration t_c of ML emission increase with increasing size of the crystals. As the total ML intensity is directly related to the area of newly created surfaces, the pressure dependence of the total ML intensity indicates that initially the total area of newly created surfaces increases with increasing value of the applied load and later on it tends to attain a saturation value for higher values of the applied load. As the strain rate is maximum at a particular time after the application of load on to a crystal, the rate of the emission of ML pulses is maximum at a particular time after the application of load on to the crystals. The dependence of N_T, I_T, and t_c on the applied pressure P_ofollows the following expressions, respectively N_T = M_o V^y [1 – exp{–δ_c (P_o – P_f)}] I_T = D b M_o V [1 – exp{–δ_c (P_o – P_f)}] and, t_c=1/αln( P₀/P_f) where V is volume of crystal, y is an exponent, δ_c =1/P_c, P_c is the critical pressure, P_fis the fracture stress, M_o, D, b, and α are constants. A good agreement is found between the theoretical and experimental results.	en_US
dc.language.iso	en_US	en_US
dc.publisher	CSIR	en_US
dc.source	IJEMS Vol.17(1) [February 2010]	en_US
dc.title	Mechanoluminescence technique for real-time monitoring of cracks produced during application of loads on crystals	en_US
dc.type	Article	en_US
Appears in Collections:	IJEMS Vol.17(1) [February 2010]

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