Location

La Jolla, CA

Start Date

1-1-1983 12:00 AM

Description

A new approach for using acoustic measurements to evaluate residual stresses in the presence of unknown material property variations is presented. It is shown that measurements using shear waves propagating along the normal to the surface of a plate do not provide sufficient information to separate the influences of stress and material property variations. To overcome this fundamental limitation, an alternative theory is developed that governs the propagation of shear waves polarized horizontally with respect to the surface of a plate (SH-waves), but propagating at oblique angles with respect to the surface normal. The question of separating the effects of residual stress and material properties on acoustic velocity is addressed in detail. In addition, a practical experimental procedure is developed that permits the evalution of the in-plane components of the principal stresses in a plate exhibiting an unknown inhomogeneous initial anistropy caused by material texture or microstructure. The procedure is then verified experimentally using an aluminum specimen with a known residual stress state, but unknown initial anisotropy.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

2B

Chapter

Section 20: Residual Stress and Acoustoelasticity

Pages

1327-1338

DOI

10.1007/978-1-4613-3706-5_86

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Evaluation of Residual Stress States Using Horizontally Polarized Shear Waves

La Jolla, CA

A new approach for using acoustic measurements to evaluate residual stresses in the presence of unknown material property variations is presented. It is shown that measurements using shear waves propagating along the normal to the surface of a plate do not provide sufficient information to separate the influences of stress and material property variations. To overcome this fundamental limitation, an alternative theory is developed that governs the propagation of shear waves polarized horizontally with respect to the surface of a plate (SH-waves), but propagating at oblique angles with respect to the surface normal. The question of separating the effects of residual stress and material properties on acoustic velocity is addressed in detail. In addition, a practical experimental procedure is developed that permits the evalution of the in-plane components of the principal stresses in a plate exhibiting an unknown inhomogeneous initial anistropy caused by material texture or microstructure. The procedure is then verified experimentally using an aluminum specimen with a known residual stress state, but unknown initial anisotropy.