High Pressure Interest Group Seminar - Utilizing neutron diffraction to non-destructively map residual stresses in operating high-pressure sample environments | Shull Wollan Center

ABSTRACT:

Neutron diffraction has proven a valuable tool for materials characterization of engineering materials, specifically for the technique’s merits in residual stress mapping. Neutron diffraction allows for non-destructive spatial characterization of residual stresses in engineering materials with deep penetration, as opposed to x-ray diffraction which can only characterize the surface stress state. The HB2B beamline at HFIR has two decades of history mapping residual stresses in a variety of components and materials.

When sample environments for high pressure fail they cause costly experimental downtime. So it would be valuable to groups at ORNL and elsewhere to utilize neutron mapping of residual stresses combined with better finite element modeling to better understand the failure points for these high-pressure environments. This talk will focus on describing the technique of residual stress mapping using a reactor source. Furthermore, some details showing how the experiments would be performed at HB2B will be presented. HB2B could even test these environments in-operando, as they would be used on other instruments, but while monitoring the stress/strain states of vital components.

Date: 

Thursday, February 22, 2018 - 16:00 to 17:00

Speaker Name: 

Jeff Bunn, Neutron Instrument Scientist and POC NRSF2, Materials Engineering Group, Neutron Scattering Division

Location: 

Shull Wollan Center (ORNL Bldg. 8630), Room A202

Host: 

Bianca Haberl

Event Type: