ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 5

Ultrasonic Measurement of Residual Stress in Textured Materials

Arora, A
Senior staff associate and member of technical staff, Rockwell International Science Center, Thousand Oaks, CA

James, MR
Senior staff associate and member of technical staff, Rockwell International Science Center, Thousand Oaks, CA

Abstract

A method is developed that determines the state of stress in a test piece in the presence of texture, that is, preferred grain orientation. This method uses frequency domain analysis of the acoustic birefringence by which an ultrasonic shear wave propagating in a material travels at slightly different velocities in the polarizations parallel and perpendicular to the axes of texture or stress. Results obtained from a Ti-6%Al-4%V block confirm that the velocity shift is linearly dependent on the amount of stress, but is independent of frequency in the case of stress as opposed to the texture. Experimental considerations involving transducer characteristics, bond (transducer to specimen) characteristics, specimen size, and signal processing are discussed in relation to the reliability and repeatability of the data.

Keywords:
preferred orientation, birefringence, polarization, transducers, bond, phase velocity, transit time, acoustic birefringence

Paper ID: JTE10254J
DOI: 10.1520/JTE10254J
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