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Acoustic Nonlinearity Parameter Due to Microplasticity

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Abstract

Acoustic nonlinearity (which is quantified in terms of an absolute material parameter, the acoustic nonlinearity parameter, β) can be caused by several sources, one of which is the elastic-plastic deformation of the material. This paper develops a model to quantify the acoustic nonlinearity parameter due to elastic-plastic deformation. This new model is applicable to general anisotropic elastic-plastic materials with existing microplasticity strains due to either monotonic or cyclic loading. As an example, the developed model is applied to calculate the acoustic nonlinearity parameter of a single crystal copper specimen subjected to cyclic fatigue loading. It is found that the acoustic nonlinearity parameter of this specimen increases monotonically with increasing fatigue cycles.

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Authors and Affiliations

  1. G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 30332-0405, Atlanta, GA, USA

    J.-Y. Kim, J. Qu & L. J. Jacobs

  2. Pratt & Whitney Materials & Processes Engineering, 400 Main Street, M/S 114-40 East Hartford, CT, 06108, USA

    J. W. Littles & M. F. Savage

Authors
  1. J.-Y. Kim
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  2. J. Qu
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  3. L. J. Jacobs
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  4. J. W. Littles
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  5. M. F. Savage
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Kim, JY., Qu, J., Jacobs, L.J. et al. Acoustic Nonlinearity Parameter Due to Microplasticity. J Nondestruct Eval 25, 28–36 (2006). https://doi.org/10.1007/s10921-006-0004-7

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  • DOI: https://doi.org/10.1007/s10921-006-0004-7

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