Please enable JavaScript.
Coggle requires JavaScript to display documents.
Fatigue paper (List of Figures (Sketch of dogbone, (Best figure) Dark…
Fatigue paper
List of Figures
-
- (Best figure) Dark-field of AM fatigued. With xi scanning, possible crack formation at Xi=0.8 to 1.1 micron. Hum, compare with AM fractured; will there be an evolution of best xi values as fatigue continues?
- (Best figure) Scatter size analysis . How will this plot evolve with in situ fatigue and dark-field imaging?
- Dark-field at 0.6 and 1 micron. Shows AM pristine has inhomogeneities as printed (sample was not annealed). AM fractured sample shows the fracture at 0.6 micron, but not a 1 micron. Also shows an annealing effect with fatigue.
- Dark-field at 1.97 micron of conventional and AM; fractured and fatigued. SHOWS crack formation in conventional fatigued. Does NOT SHOW crack formation in AM fatigued
- Post-neutron. The samples studied as fatigued were then fatigued to fracture. Doe the fractures align with the neutron dark-field features?
-
-
- Bragg edge spectra. Fatigue barely affects crystallography/texture of grains
- conventional tomography: optical, volume, and slice.
- Example of raw interferogram data and how it is analyzed
- Layout of NIST far-field (Talbot-Lau is sort of similar and in previous paper)
-
-
Bragg edge.
Does not find crack formation in this 3mm thick fatigue sample. Bragg nearly found crack in 2 mm tensile stress sample. Why the difference?
-
far-field
blur is bad and could not find crack in conventional xi scan was great for AM. In an ideal world, would have the low blur of Talbot-Lau and the xi scan of far-field
Post imaging, the fatigued samples were again fatigued, this time to failure. Optical images are compared with neutron dark-field. Does dark-field predict failure?
SEM of fatigued to failure AM. Can SEM explain why neutron dark-field observed crack formation? Answer: there are micron-sized pores near fractures. Next experiment series: dark-field, (fatigue, dark-field, SEM)n
-
-
Imaging defects with X-ray and neutrons, interferometry
What we did: 3 neutron methods applied to fatigued AM and conventional. Best result is dark-field at 1 micron