Accession Number:

AD1004970

Title:

Non-destructive Maps of Stress Concentration Effects near Notches

Descriptive Note:

Technical Report

Corporate Author:

Defence Research Establishment Atlantic Dartmouth, Nova Scotia Canada

Personal Author(s):

Report Date:

1997-06-16

Pagination or Media Count:

9.0

Abstract:

Recent advances in neutron detector technology and the ability of neutrons to penetrate through many millimetres of most engineering materials have made it feasible to investigate the effects of stress-concentration near notches. To demonstrate this capability, the development of the strainfield near a sharp notch in an HY -100 steel bar is scanned as a three-point bending load is increased to the point of metal-tearing. On unloading, residual stresses are scanned. As a second demonstration, the stress-concentration effects of a blunt notch in a tensile test specimen are presented. These measurements are performed at a temperature of 250 C, which is maintained by a heater that surrounds the specimen. In both examples, the gradients of the strain distribution are substantial, but neutron diffraction has a sufficient spatial resolution to characterize the effects of stress concentration quantitatively.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE