Title page for ETD etd-10302008-120618
|Type of Document
||Jolles, Mitchell Ira
||A photoelastic technique for the determination of stress intensity factors.
|Smith, Charles W.
|Henneke, Edmund G. II
|Louthan, M. R. Jr.
|McNitt, R. P.
|Reifsnider, Kenneth L.
|Date of Defense
A technique for obtaining values of the stress intensity factor
from photoelastic data for three dimensional cracked body problems is
described. The stress intensity determination is accomplished without
resorting to stress separation methods through employing an expression
for the maximum in-plane shearing stress consisting of a singular term
which is related to the stress intensity factor and a constant term
which is related to the regular stress field. The technique itself
identifies the zone dominated by the singular stresses.
The effects of using artificial cracks and a model material which
exhibits a Poisson's ratio v = 0.5 are assessed. The application of
the technique to a variety of technologically important three dimensional
problems is illustrated for Mode I loading and combined Mode I -
Mode II loading. The major advantages and limitations of the technique
Replications of identical test geometries indicate a scatter of
the stress intensity factor determination of less than ± 5%. It is
concluded that the method is a valid means for the independent determination
of values of the stress intensity factor.
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