The Residual Stress Diffractometer uses the high penetrating
power of the neutron to probe the lattice parameters of
crystal planes inside bulk samples. The contraction
or dilation of the planes (and the directional dependence) is
then related to the internal stress state of the sample. Engineering
materials, like steel and aluminum alloys can be
probed, examining internal volumes of order 1mm3, through the
use of specialized focusing optics and small position sensitive
detector. Both residual macrostresses and microstresses can be
measured, as well as stresses in a material under tensile loads.
For residual macrostresses, or stresses that vary over the scale
of the component's dimensions, we can measure the stress averaged
over gage volumes of 50mm3 down to potentially 1mm3. Specimens
can range in size from a few grams to around 100 kg. Measurements
can be made to depths of several centimeters depending on the
material. The measurement of residual microstresses, or the stresses
between phases in multiphase or composite materials, is typically
done on specimens of a few centimeters in size. Strain sensitivities
of 100 me or stress sensitivities
on the order of 50 MPa can typically be achieved. Possibilities
and limitations are varied. Please contact Andy Winholtz (573)
882-6322, winholtz@missouri.edu
or Aaron Krawitz (573) 882-7671, krawitza@missouri.edu
for further information and discussion.
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University of Missouri-Columbia
