Determination of the Dependence of Ultrasonic Shear Wave Transit Times on Temperatures, Stress and Frequency.
Abstract
The practical use of ultrasonics to determine residual stress requires a technique to separate the effects of texture and stress. This memorandum reports the results of a preliminary study of the temperature, stress and frequency dependence of ultrasonic shear wave transit times in a 2024T4 aluminium alloy sample. The acoustoelastic constant, the relative temperature coefficient and the texture induced anisotropy were found to be of the order .0001 /MPa, 0.001 /K and 0.01 respectively. Two techniques of separating the effects of texture and stress were investigated. These were the stress dependence of temperature coefficient and the frequency dependence of the birefringence. It was found that, within the precision of measurement, there was no stress dependence of the temperature coefficient of shear wave polarization parallel or perpendicular to the stress. The frequency dependence had a complex behaviour which is not yet understood. Keywords: Stresses; Tie measurement; S waves; Transit times. (Australia)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA159468
Entities
People
- J. G. Sparrow
- S. J. Rumble