| DOI | Trouver le DOI : https://doi.org/10.1115/1.1482407 |
|---|
| Auteur | Rechercher : Root, John1; Rechercher : Katsaras, John1; Rechercher : Porter, John; Rechercher : Leitch, Brian |
|---|
| Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
|
|---|
| Format | Texte, Article |
|---|
| Sujet | load distribution; neutron diffraction; pressure vessels; strain measurement; stress measurement |
|---|
| Résumé | 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. |
|---|
| Date de publication | 2002-07-26 |
|---|
| Maison d’édition | ASME |
|---|
| Dans | |
|---|
| Numéro NPARC | 12335872 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 6ccfc5b4-a87b-49a1-9ae0-b1e57acfa0c6 |
|---|
| Enregistrement créé | 2009-09-10 |
|---|
| Enregistrement modifié | 2020-04-06 |
|---|
