| DOI | Resolve DOI: https://doi.org/10.1115/1.1482407 |
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| Author | Search for: Root, John1; Search for: Katsaras, John1; Search for: Porter, John; Search for: Leitch, Brian |
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| Affiliation | - National Research Council Canada. NRC Canadian Neutron Beam Centre
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| Format | Text, Article |
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| Subject | load distribution; neutron diffraction; pressure vessels; strain measurement; stress measurement |
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| Abstract | Recent advances in neutron detector technology and the ability of neutrons to penetrate through many millimeters of most engineering materials have made it feasible to investigate the effects of sub-surface stress-concentration in the vicinity of notches. Neutron-diffraction strain measurements are non-destructive and capable of tracking the development of the elastic strain field as a function of applied load in a single specimen. This paper presents two demonstrations of neutron-diffraction strain-scanning with high spatial resolution. First, the development of the strain field near a notch in an HY-100 steel bar is scanned as a three-point bending load is increased to the point of metal-tearing. Second, the stress-concentration effects of a blunt notch in a tensile test specimen are presented. The measurements are performed while the specimen is held at a temperature of 250°C and while load is applied to maintain constant total strain. The neutron diffraction measurements reveal a gradual redistribution of the stress concentration over time. In both examples, the gradients of the strain distribution are substantial, but neutron diffraction has a sufficient spatial resolution (of the order 0.5 mm to 1.0 mm) to characterize the details of a stress concentration field. |
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| Publication date | 2002-07-26 |
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| Publisher | ASME |
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| In | |
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| NPARC number | 12335872 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 6ccfc5b4-a87b-49a1-9ae0-b1e57acfa0c6 |
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| Record created | 2009-09-10 |
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| Record modified | 2020-04-06 |
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