Appeal No. 1999-2393
Application 08/845,848
to 12 have been withdrawn from consideration, see Paper No. 3.
Claims 13 to 15 have been indicated by the examiner to have
allowable subject matter, see answer at page 1.
The disclosed invention is directed to a material test
specimen for conducting stress and strain measurements that is
tailored to provide information on multiaxial stress and
strain states in a controlled manner under tensile
deformation. The test specimen geometry employs combinations,
commonly called "stress concentrators", that generate stress
and strain gradients in the material under test. The geometry
is composed of three geometric features: first, a primary
outer geometry of uniform cross-section suitable for a tension
test machine which generates a global deformation field;
secondly, a secondary inner geometry that produces nonuniform
deformation from the global deformation; and lastly, a set of
tertiary inner geometries that modulate the nonuniform
deformation to promote or avoid fracture at various strain and
stress states as desired. After a test, a stress analysis is
performed utilizing appropriate analytical or computational
simulation to recreate the stress and strain histories
throughout the specimen. Correlation between the physically
2
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