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Development of a scanning laser crack detection technique for corrosion fatigue testing of fine wire

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Abstract

A scanning laser crack detection technique has been developed for use in corrosion fatigue testing of fine metallic wires. The technique has been integrated into a computerized data acquisition and control system allowing the unattended operation of extended fatigue tests. The system is capable of detecting cracks with surface lengths as small as 100 μm, with crack opening displacements as low as 1 μm. Detection schemes of light loss and light scattering have been successfully used to monitor crack initiation in air and in 0.9% sodium chloride solution. The present scanning laser system has been used for crack initiation detection in over 50 fatigue experiments and has the potential for use in crack growth monitoring. The method can provide information concerning other surface phenomena in addition to the study of cracks. The technique has potential applications beyond metallic wires, including fibers used in optics and ceramic reinforcement fibers used in structural composites.

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Authors and Affiliations

  1. Edwards CVS Division, Baxter Healthcare, 17221 Red Hill Avenue, 92714, Irvine, California, USA

    Paul A. Schmidt

  2. Department of Mechanical and Aerospace Engineering, University of California at Irvine, 92717, Irvine, California, USA

    James C. Earthman

Authors
  1. Paul A. Schmidt
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  2. James C. Earthman
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Schmidt, P.A., Earthman, J.C. Development of a scanning laser crack detection technique for corrosion fatigue testing of fine wire. Journal of Materials Research 10, 372–380 (1995). https://doi.org/10.1557/JMR.1995.0372

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  • DOI: https://doi.org/10.1557/JMR.1995.0372

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