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Rev Sci Instrum. 2016 Apr;87(4):043902. doi: 10.1063/1.4945304.

A method of measuring dynamic strain under electromagnetic forming conditions.

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State Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
College of Physics, Jilin University, Changchun 130023, People's Republic of China.
School of Materials Science and Engineering and Key lab of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China.


Dynamic strain measurement is rather important for the characterization of mechanical behaviors in electromagnetic forming process, but it has been hindered by high strain rate and serious electromagnetic interference for years. In this work, a simple and effective strain measuring technique for physical and mechanical behavior studies in the electromagnetic forming process has been developed. High resolution (∼5 ppm) of strain curves of a budging aluminum tube in pulsed electromagnetic field has been successfully measured using this technique. The measured strain rate is about 10(5) s(-1), which depends on the discharging conditions, nearly one order of magnitude of higher than that under conventional split Hopkins pressure bar loading conditions (∼10(4) s(-1)). It has been found that the dynamic fracture toughness of an aluminum alloy is significantly enhanced during the electromagnetic forming, which explains why the formability is much larger under electromagnetic forging conditions in comparison with conventional forging processes.


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