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Experimental Mechanics

, Volume 36, Issue 4, pp 325–332 | Cite as

Acoustoelasticity: Ultrasonic stress field reconstruction

  • H. R. Dorfi
  • H. R. Busby
  • M. Janssen
Article

Abstract

Based on the theory of acoustoelasticity, a new ultrasonic stress reconstruction method—the generalized acoustic ratio (GAR) technique—is developed for locally plane structures and orthotropic materials. For given transit times of the three wave modes and the shear wave polarization angle, the local plane stress tensor is uniquely determined. The GAR technique yields accurate stress estimates with relatively small temperature sensitivity. Based on calibration constants from three uniaxial specimens, the entire stress field in a compact tension specimen is reconstructed. The results are in very good agreement with stress predictions from an elastoplastic finite element analysis. To further improve the measurements, a numerical technique, the stress field approximation (SFA) technique, is developed. The SFA technique uses a smooth local bicubic spline approximation and aims at improving the overall stress field estimate by enforcing the equilibrium equations, the stress boundary conditions and symmetry conditions. Numerical results show that both the average error and its spread are indeed reduced.

Keywords

Shear Wave Orthotropic Material Compact Tension Compact Tension Specimen Spline Approximation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Society for Experimental Mechanics, Inc. 1996

Authors and Affiliations

  • H. R. Dorfi
    • 1
  • H. R. Busby
    • 1
  • M. Janssen
    • 2
  1. 1.Department of Mechanical EngineeringThe Ohio State UniversityColumbus
  2. 2.Department of Materials ScienceDelft University of TechnologyDelftThe Netherlands

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