####################################################
# Judy Pang <pangj@ornl.gov>
# requesting 5 days, at minimum=4 days
# beamline 34ID, "Load partition across the crack region of composite"
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# top:/home/www/beamtime-requests/req00474.txt
# UNICAT Member Beam Time Request  #474
# created Fri Aug 29 12:46:30 CDT 2003
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beamline:
	34ID

collaboration:
	Yes

contact:
	pangj@ornl.gov

days:
	5

description:
	Fracture toughness in composites is largely affected by the load partitioning between the matrix and the reinforced phases. A crucial parameter to establish the relationship of the load partitioning and fracture toughness is the stress of the two phases. Measurements of strain at the crack tip of Ni3Al-TiC have been made on the beamline ID34-E. The results indicate such measurements are feasible. We propose an experiment to measure the load partitioning of a series of simple composite system composed of two layers of single crystal ceramics sandwiched with a single crystal metal matrix. A crack will be cut along the cleavage plane of the ceramics reinforced phase and the load shared among the two phases as it propagates will be probed. The proposed composite systems include Al/Al2O3, Al/MgO, Cu/Si. Samples will be prepared by the intermetallics group at ORNL.

equipment_required:
	

experiment:
	Load partition across the crack region of composite

foreign_nationals:
	Judy Pang

hazards:
	

minimumdays:
	4

name:
	Judy Pang

nonmembers:
	Joachim Schneibel

unacceptable_dates:
	October and First week of November

z34ID_change_undulator:
	yes

z34ID_details:
	

z34ID_on_axis:
	yes

z34ID_parasitic:
	no

z34ID_taper:
	yes


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