In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 91, No. 5 ( 1992-05-01), p. 2643-2653
Abstract:
A membrane theory is developed for measurement of stress in weakly anisotropic thin sheets. The thin sheets are modeled as prestressed planar membranes, and the application in stress evaluation of horizontally polarized quasishear waves (which correspond to the SH0 mode in a plate theory) is studied. In principle, the acoustoelastic theory presented here would be valid so long as the superimposed small-amplitude stress waves could be taken as hyperelastic, irrespective of the origin of the prestress and the thermomechanical history of the specimen in question. A series of experiments was performed to examine the validity of this theory for thin aluminum sheets that had undergone plastic deformations. By using a probe that consisted of three electromagnetic acoustic transducers (one transmitter and two receivers that were 30 mm apart), velocities of horizontally polarized quasishear waves were measured for various directions of propagation at various places of each sample sheet. There were indications that the present theory and measurement system delivered at each place a good estimate of the local principal surface-stress directions and difference in principal surface stresses. Some of the samples were annealed after the aforementioned experiments were completed. Ultrasonic measurements were repeated for the annealed samples; they showed that residual stresses were relieved by the annealing.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1992
detail.hit.zdb_id:
1461063-2
