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A theoretical model for the electromagnetic radiation emission during plastic deformation and crack propagation in metallic materials

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Abstract

This paper presents a theoretical model for the electromagnetic radiation (EMR) emissions during plastic deformation and crack propagation in metallic materials. It is shown that under an externally applied stress, edge dislocations within the plastic zone ahead of a crack tip form accelerated electric line dipoles which give rise to the EMR emissions. The dynamic motion of these dislocations becomes overdamped, underdamped or critically damped, depending upon the material/microstructural properties such as mass per unit length of dislocation, line tension, damping coefficient, and distance between the dislocation pinning points. The nature of the EMR signals, viz. exponential decay or damped sinusoidal, is decided essentially by these damping characteristics. The EMR emissions are followed by crack propagation in metallic materials. The EMR has a continuous frequency spectrum with a frequency bandwidth ranging from 108 to 1012 radians s−1, depending upon the properties of the metals. Screw dislocations do not contribute to the EMR emissions. The paper also presents some experimental results on the EMR emissions in ASTM B265 grade 2 titanium sheets. The nature (damped sinusoidal and exponential decay), amplitude and frequency of the observed EMR emissions are in conformity with the predictions of the theoretical model.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Birla Institute of Technology, Mesra, Ranchi, 835 215, India

    Ashok Misra, Vishal Singh Chauhan & Bodduluru Srilakshmi

  2. Department of Electrical and Electronics Engineering, Birla Institute of Technology, Mesra, Ranchi, 835 215, India

    Ram Chandra Prasad

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  1. Ashok Misra
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  3. Vishal Singh Chauhan
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  4. Bodduluru Srilakshmi
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Correspondence to Vishal Singh Chauhan.

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Misra, A., Prasad, R.C., Chauhan, V.S. et al. A theoretical model for the electromagnetic radiation emission during plastic deformation and crack propagation in metallic materials. Int J Fract 145, 99–121 (2007). https://doi.org/10.1007/s10704-007-9107-0

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