Accession Number:

ADA056261

Title:

An Ultrasonic Pulse-Height Difference Method of Recording Crack Growth over an Extended Period.

Descriptive Note:

Materials note,

Corporate Author:

AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s):

• Pollock,W. J.
• Farrell,A. J.

Report Date:

1977-09-01

Pagination or Media Count:

27.0

Abstract:

A method for recording slow crack growth, using a conventional ultrasonic tester and chart recorder, is described. The problems caused by changes in the measuring system over long periods were overcome by relating crack growth to the amplitude difference between the crack reflection and a reference reflection. Some applications of the technique are described. Author

Descriptors:

• *STEEL
• *CRACK PROPAGATION
• *ULTRASONIC RADIATION
• OPTICAL DETECTION
• HIGH STRENGTH ALLOYS
• ELECTRICAL PROPERTIES
• DEFECTS(MATERIALS)
• SURFACE PROPERTIES
• ECHOES
• PULSES
• STRESS CORROSION
• AUSTRALIA
• ACOUSTIC EMISSIONS

Subject Categories:

• Properties of Metals and Alloys
• Acoustics
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE