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      Effect of notch-depth ratio on intermittent electromagnetic radiation from Cu-Ni alloy under tension

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      Materials Testing
      Carl Hanser Verlag

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          This paper presents some experimental results on the effect of the notch–depth ratio on intermittent electromagnetic radiation during the progressive plastic deformation of a Cu-Ni alloy sheet specimen under tension. An electromagnetic antenna was used for receiving the electromagnetic waves emitted by the deforming specimen. The specimens (with varied notch-depth ratios) first emit electromagnetic radiation near yield which is always oscillatory in nature. However, the axial strain at the initial emission of the electromagnetic radiation increases with an increase in the notch-depth ratio. The nature of electromagnetic radiation signals changes from oscillatory to exponential until instability is reached. This shows that the viscous coefficient of the material of the specimens increases during strain-hardening. The paper also presents a correlation between electromagnetic radiation emission parameters and the radius of the plastic zone created ahead of the advancing crack tip, an important parameter in fracture mechanics. With an increase in the plastic zone size, the amount of intermittent electromagnetic radiation decreases asymptotically: the first electromagnetic radiation amplitude increases linearly and a maximum energy burst first decreases the electromagnetic radiation frequency parabolically. Initial electromagnetic radiation characteristics differ considerably from optimum electromagnetic radiation emissions within the strain-hardening region. These experimental results show a novel technique for studying various fracture mechanics parameters and also for developing a non-contact crack growth monitor.

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          Most cited references23

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          Acoustic and Electromagnetic Emissions as Precursor Phenomena in Failure Processes

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            A physical model for the stress-induced electromagnetic effect in metals

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              Mechanical and Electromagnetic Emissions Related to Stress-Induced Cracks


                Author and article information

                Materials Testing
                Carl Hanser Verlag
                30 August 2019
                : 61
                : 9
                : 885-893
                1 Mumbai
                2 Patna
                3 Ranchi, India
                Author notes
                [] Correspondence Address, Ranjana Singh, Mukesh Patel School of Technology, Management and Engineering, Department of Mechanical Engineering, Mumbai 400056, India, E-mail: ranjanakrsingh24@ 123456gmail.com

                Dr. Ranjana Singh, born in 1974, studied Mechanical Engineering at M. I. T. Muzaffarpur, India and received a Master's in Engineering at the Birla Institute of Technology (B. I. T.), Ranchi, India in 2004. She completed her PhD thesis at the same institute in 2018 on the correlation between electromagnetic radiation and plastic deformation in metals and alloys. Currently, she is working as an Assistant Professor at MPSTME, Mumbai, India. Prior to this, she also taught Mechanical Engineering students at Amity University, Noida, India. She has been pursuing her research interest in the field of metal physics & material engineering for over 10 years.

                Dr. S. P. Lal, born in 1962, studied Production Engineering at B. I. T. Mesra, India and completed his PhD at the same institute in 2007. Currently, he is working as a Professor at B. I. T. Patna. Additionally, he also held the positions of Deputy Director (2008–2013) and Director at B. I. T., Patna (2013–2017). He has also worked as an Associate Professor at B. I. T., Bahrain in 1999 and 2003 and project manager at Hindalco and Orient Paper Industries Limited for 15 years.

                Dr. Ashok Misra, born in 1946; graduated in Mechanical Engineering from Birla Institute of Technology (B. I. T.), Ranchi, India in 1967; D.Sc. from Birla Institute of Technology Ranchi in 1980. He retired as Emeritus Professor from B. I. T. Ranchi in 2012. He has been an acclaimed researcher in the field of metal physics. His work on studying the electromagnetic effects at metallic fracture was first published in Nature in 1975.

                © 2019, Carl Hanser Verlag, München
                Page count
                References: 30, Pages: 9
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science


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