Accession Number:

ADA172113

Title:

Ultrasonic Scattering by Planar and Non-Planar Cracks,

Descriptive Note:

Corporate Author:

COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Datta, Subhendu K.
• Shah, Arvind H.

Report Date:

1986-08-01

Pagination or Media Count:

28.0

Abstract:

Scattering of elastic waves by surface-breaking planar and non planar branched cracks, of considerable current interest for ultrasonic nondestructive evaluation, has been studied in this paper. Attention has been focused on the near field surface displacements and the crack tips stress intensity factors. For planar normal cracks the stress intensity factors are shown to agree with earlier results. Numerical results showing normalized vertical surface displacements are presented for incident body and surface waves. It is shown that the results for planar and branched cracks can be significantly different in some instances.

Descriptors:

• *NONDESTRUCTIVE TESTING
• *ACOUSTIC SCATTERING
• *ULTRASONIC TESTS
• *ELASTIC WAVES
• SURFACE WAVES
• FINITE ELEMENT ANALYSIS
• CRACKS
• DISPLACEMENT
• SURFACES
• ULTRASONICS
• VERTICAL ORIENTATION
• PLANAR STRUCTURES
• NONPLANAR
• NEAR FIELD
• STRESS CONCENTRATION

Subject Categories:

• Test Facilities, Equipment and Methods
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE