NDLI: Electromagnetic Interference in Measurements of Radial Stress During Split Hopkinson Pressure Bar Experiments

Content Provider	Springer Nature Link
Author	Barr, A.D. Clarke, S.D. Tyas, A. Warren, J.A.
Copyright Year	2017
Abstract	Split Hopkinson pressure bar experiments on soils are often carried out using a rigid steel confining ring to provide plane strain conditions, and measurements of the circumferential strain in the ring can be used to infer the radial stress on the surface of the specimen. Previous experiments have shown evidence of irregular electromagnetic interference in measurements of radial stress, which obscures the signals and impedes analysis. The development of robust constitutive models for soils in blast and impact events relies on the accurate characterisation of this behaviour, and so it is necessary to isolate and remove the source of interference. This paper uses an induction coil to identify the source of the anomalous signals, which are found to be due to induced currents in the gauge lead wires from the movement of magnetised pressure bars (martensitic stainless steel, 440C). Comparative experiments on sand and rubber specimens are used to show that the deforming soil specimen does not make a significant contribution to this activity, and recommendations are made on reducing electromagnetic interference to provide reliable radial stress measurements.
Starting Page	813
Ending Page	817
Page Count	5
File Format	PDF
ISSN	00144851
Journal	Experimental Mechanics
Volume Number	57
Issue Number	5
e-ISSN	17412765
Language	English
Publisher	Springer US
Publisher Date	2017-04-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Split Hopkinson pressure bar Radial stress Electromagnetic interference Soils Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Optics, Lasers, Photonics, Optical Devices Structural Mechanics Vibration, Dynamical Systems, Control Classical Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering Aerospace Engineering

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