Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Measurements sensitive to dislocation pinning are natural candidates for nondestructively evaluating the integrity of structures before cracks develop, because the mobility of dislocations plays a central role in determining the mechanical properties of materials. Traditionally, fundamental research on dislocation pinning below the plastic regime has employed low-frequency (∼ 1 Hz) mechanical vibrations that simultaneously break dislocations away from pinning points and sense the strength of pinning [1]. The exploratory study described here has pursued an ultrasonic approach, viewing high-frequency measurements as being more practical for most potential applications. It has sought to determine whether measurements of ultrasonic dislocation damping under quasistatic loads can provide information on prior mechanical damage of structural ferritic steels.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 6: Materials Characterization

Section

Defects and Cumulative Damage

Pages

1863-1869

DOI

10.1007/978-1-4615-4791-4_238

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Effects of Plastic Deformation on Ultrasonic Damping in Ferritic Steel

Snowbird, UT, USA

Measurements sensitive to dislocation pinning are natural candidates for nondestructively evaluating the integrity of structures before cracks develop, because the mobility of dislocations plays a central role in determining the mechanical properties of materials. Traditionally, fundamental research on dislocation pinning below the plastic regime has employed low-frequency (∼ 1 Hz) mechanical vibrations that simultaneously break dislocations away from pinning points and sense the strength of pinning [1]. The exploratory study described here has pursued an ultrasonic approach, viewing high-frequency measurements as being more practical for most potential applications. It has sought to determine whether measurements of ultrasonic dislocation damping under quasistatic loads can provide information on prior mechanical damage of structural ferritic steels.