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IJEMS Vol.14(6) [December 2007] >


Title: Fracto–mechanoluminescence produced during slow deformation of solids
Authors: Chandra, B P
Mahobia, S K
Kuraria, R K
Chaudhary, Vibha
Issue Date: Dec-2007
Publisher: CSIR
Abstract: The present paper reports the mechanoluminescence (ML) induced by the movement of cracks produced during slow deformation of solids. The ML may be induced by fracture of crystals due to several processes involved in charging of newly-created surfaces. In fracto-ML, the number of ML pulses emitted indicates the number of cracks moved in a crystal. Thus, there is one-to-one correspondence between the number of cracks formed and the number of ML flashes emitted during the deformation of a crystal. An expression derived for the dependence of the number of ML flashes, Nք on the strain ε of crystals may be expressed as, Nք= [{exp ⍺(ε–ε f )}–1], where εf is the fracture strain and ⍺ is a constant. The total ML intensity indicates the total area of the newly-created surfaces created during the deformation of a crystal. As the decay time of ML is constant and of the order of microseconds, in the case of slow deformation, the peak of ML intensity induced by a single crack indicates the area of newly-created surfaces. The studies on fracto-ML give important information that the number of cracks increases exponentially with the deformation of crystals and the area of newly created surfaces increases linearly with the deformation of crystals. The ML may be useful in the study of crack dynamics in microsecond and nanosecond ranges, whereby important information related to the initiation, propagation and interaction of cracks in solids may be obtained. The rapid photographic methods and CCD cameras can be used effectively to map the ML emission from fracture of solids. A good agreement is found between the theoretical and experimental results.
Page(s): 443-446
ISSN: 0971-4588
Source:IJEMS Vol.14(6) [December 2007]

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