Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

It is well known that residual stress can be measured with varying degrees of success by x-ray diffraction methods [1]. Nonetheless, it would be well to have additional nondestructive techniques capable of this kind of measurement. Positron annihilation is one potential alternative, which has previously been applied to the study of shot peening [2]. Although shot peening produced readily detectable changes in the positron annihilation measurements, it was not possible to relate these changes directly to the residual stresses produced. Since residual stresses are elastic, the intention of the present research was to use positron annihilation to initially measure applied uniaxial elastic stresses and then extend the technique to measure actual residual stresses.

Volume

8B

Chapter

Chapter 9: Characterization of Materials

Section

Acoustoelasticity, Stress and Texture

Pages

1903-1907

DOI

10.1007/978-1-4613-0817-1_241

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

An Attempt to Measure Elastic Stress with Positrons

La Jolla, CA

It is well known that residual stress can be measured with varying degrees of success by x-ray diffraction methods [1]. Nonetheless, it would be well to have additional nondestructive techniques capable of this kind of measurement. Positron annihilation is one potential alternative, which has previously been applied to the study of shot peening [2]. Although shot peening produced readily detectable changes in the positron annihilation measurements, it was not possible to relate these changes directly to the residual stresses produced. Since residual stresses are elastic, the intention of the present research was to use positron annihilation to initially measure applied uniaxial elastic stresses and then extend the technique to measure actual residual stresses.