Non-destructive Maps of Stress Concentration Effects near Notches
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 16, 1997
- Accession Number
- AD1004970
Entities
People
- J. Katsaras
- J. Porter
- J. Root