Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
NCAL: Diffraction Stress Measurement Systems
Two independent x-ray diffraction stress measurement systems are available in the NIST Center for Automotive Lightweighting.
These systems are integrated with the cruciform test machine and shared between the octostrain test machine and forming limit press.
Other x-ray stress measurement systems in MML and NCNR are also available, as well as the neutron diffraction beamline NCNR BT-8.
Specifications/Capabilities
Diffraction Stress Measurement System Capabilities:
- Measurement of the complete lattice strain (stress) tensor on specimen surface under applied load
- Measurement of applied, residual, and intergranular strain tensors
- X, Y, and Z motors for mapping values over various points on the specimen surface
- Cr, Co, Cu, & Mn tubes for a range of materials and (hkl) planes
- Cr (211) - ferritic steels; (222 or 311) - aluminum alloys; (1 0 -1 4 or 2 0 -2 2) - magnesium
- Co (310) - ferritic steels; (331 or 420) - aluminum alloys; (2 1 -3 3) - alpha-titanium;
- Cu (2 1 -3 3) - alpha-titanium; (2 2 -4 0) - magnesium; (420) - nickel
- Mn (311) - austenitic steels, copper alloys, nickel alloys
- Registry between the XRD coordinate system and DIC system coordinates
- Illumination spot sizes between 0.5 mm and 4 mm, with either round or rectangular apertures