Residualstress characterization by use of elasticwavescattering measurements
Abstract
The presence of a state of residual stress in a material can impair its structural quality by adversely affecting its elastic limit, yield point, etc. The appropriate equations for the use of elastic waves to probe an inhomogeneous state of residual are derived. Unlike other treatments, which relate these nonlinear effects to small relative changes in propagation speed of an incident wave, these effects are identified as a source of scattering of the incident wave. Like other treatments, one difficulty with ultrasonic residual stress measurements is separating small residual stress effects for other effects. Elastic wave propagation in the presence of nonuniform residual stress is viewed as a scattering problem. One should note that in various limits, such as that of short wavelength, this scattering problem (as well as any other) is treated by optical methods (ray bendings, diffraction, etc.).
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1982
 Bibcode:
 1982STIN...8331985D
 Keywords:

 Angular Distribution;
 Elastic Deformation;
 Elastic Scattering;
 Residual Stress;
 Wave Propagation;
 Born Approximation;
 EulerLagrange Equation;
 Perturbation;
 Spheres;
 Tensors;
 X Ray Analysis;
 Electronics and Electrical Engineering