Location

La Jolla, CA

Start Date

1-1-1987 12:00 AM

Description

Our general perturbation formalism1 for the propagation of Rayleigh waves on the surface of initially deformed anisotropic material plates is applied to the problem of separation of material texture and stress. The preferential alignment of crystallographic axes in a polycrystalline material is described in terms of their orientation distribution function2. We consider explicitly the case of an orthotropic distribution of cubic crystallites, which occurs, for example, in aluminum and steel alloys. The measured values of the Rayleigh wave phase velocity at different angles on the material plate can be used for the determination, in a reference plate with similar texture, of the three coefficients W400, W420 and W440, which characterize the orientation distribution. An extension of the formalism then allows us to separate the acoustoelastic effects of the initial stresses. An error analysis and a comparison with similar techniques using grazing SH-waves complete our discussion.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

6B

Chapter

Chapter 8: Materials Characterization

Section

Acoustoelasticity, Stress, and Texture

Pages

1533-1540

DOI

10.1007/978-1-4613-1893-4_172

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic Separation of Stress and Texture Effects in Polycrystalline Aggregates

La Jolla, CA

Our general perturbation formalism1 for the propagation of Rayleigh waves on the surface of initially deformed anisotropic material plates is applied to the problem of separation of material texture and stress. The preferential alignment of crystallographic axes in a polycrystalline material is described in terms of their orientation distribution function2. We consider explicitly the case of an orthotropic distribution of cubic crystallites, which occurs, for example, in aluminum and steel alloys. The measured values of the Rayleigh wave phase velocity at different angles on the material plate can be used for the determination, in a reference plate with similar texture, of the three coefficients W400, W420 and W440, which characterize the orientation distribution. An extension of the formalism then allows us to separate the acoustoelastic effects of the initial stresses. An error analysis and a comparison with similar techniques using grazing SH-waves complete our discussion.