NON-DESTRUCTIVE MAPS OF STRESS CONCENTRATION EFFECTS NEAR NOTCHES

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Authors
  1. Root, J.
  2. Katsaras, J.
  3. Porter, J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);National Research Council of Canada, Chalk River ONT (CAN) Chalk River Labs
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 strain field 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 tst specimen are presented. These measurements are performed at a temperature of 250C, 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.
Keywords
Notches
Date of publication
16 Jun 1997
Number of Pages
6
DSTKIM No
98-01454
CANDIS No
508290
Format(s):
Hardcopy;Document Image stored on Optical Disk

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