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To Know Ourselves
An overview of the underlying science of the Human Genome Project
Date:
July 1, 1996
Creator:
Vaughan, Douglas
System:
The UNT Digital Library
Subcritical Crack Growth in Ceramic Composites at High Temperature Measured Using Digital Image Correlation
An in situ experimental technique is described that allows high resolution, high sensitivity determination of displacements and full-field strains during high temperature mechanical testing. The technique is used to investigate elevated temperature crack growth in SiC/Nicalon sub f composites. At 1150 degrees C, the reinforcing fibers have a higher creep susceptibility than the matrix. Fiber creep leads to relaxation of crack bridging tractions, resulting in subcritical crack growth. Differential image analysis is used to measure the crack opening displacement profile u(x) of an advancing, bridged crack. With appropriate modeling, such data can be used to determine the traction law, from which the mechanics of cracking and failure may be determined.
Date:
January 11, 1996
Creator:
Mumm, D. R.; Morris, W. L.; Dadkhah, M. S. & Cox, B. N.
System:
The UNT Digital Library
PROPERTIES OF SILICON ON DEFECT LAYER MATERIAL.
None
Date:
November 27, 1996
Creator:
Li, H.
System:
The UNT Digital Library