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# Judy Pang <pangj@ornl.gov>
# requesting 3 days, at minimum=2 days
# beamline 34ID-E, Dependence of Deformation zone size in Al2024 alloy on fatigue conditions
# instrument 34ID-E microbeam
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# top:/home/www/beamtime-requests/req00571.txt
# UNICAT Member Beam Time Request  #571
# created Tue Apr 13 16:51:10 CDT 2004
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beamline:
	34ID-E

collaboration:
	No

collaborator_Wenjun:
	ON

contact:
	pangj@ornl.gov

days:
	3

description:
	Effects of fatigue on materials are highly dependent on the environmental conditions. The proposed experiment is to study the difference in deformation zone size in edge cracked Al2024 alloys. Compact tension (CT) specimens subjected to fatigue test in humid environment and vacuum respectively will be studied. The samples will be first mapped by electron back scattering diffraction (EBSD). Locations on the crack corresponding to the stress intensity range will be marked to facilitate measurements. The fatigue tests were performed under constant maximum stress intensity, while the intensity range is continually decreased towards the end of the crack. Greater plastic damage is expected at the higher stress intensity range tested in wet air.  The objective of this study is to detect any differences in the extent of plasticity surrounding the crack tip or crack wake of the two samples. The primary experimental parameter required is orientation change of individual measured volumes. It is estimated 3 beam days will be needed to complete the measurements.

equipment_required:
	

experiment:
	Dependence of Deformation zone size in Al2024 alloy on fatigue conditions

foreign_nationals:
	Yun Jo Ro

hazards:
	Experiment will be taken under ambient conditions

instrument:
	34ID-E microbeam

instrument_other:
	

minimumdays:
	2

name:
	Judy Pang

nonmembers:
	Profs. Sean Agnew, Matt Begley, Rick Gangloff(University of Virginia)
Yun Jo Ro (University of Virginia)

unacceptable_dates:
	Month of July will not work for us and the best will be sometime in June.

z34ID_change_undulator:
	no

z34ID_details:
	The experiment will be run under one operational setting but NO CHANGE during the measurement for each sample (~ 1.5 days)

z34ID_parasitic:
	yes


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