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Peenstress, developed by Metal Improvement Company,
is a computer program that is capable of predicting
the residual stresses that controlled shot peening introduces
into many metals.
Metal Improvement Company maintains an extensive library
of case histories on actual applications to compare
them to Peenstress predictions. The Peenstress database
contains a selection of materials and heat treating
conditions from which to choose. The user first selects
the appropriate material (and heat treating condition),
then selects the shot peening parameters that consist
of shot size, shot intensity and shot material and hardness.
Peenstress will ultimately print out a stress curve
that shows both the magnitude of the residual stress
distribution and the depth profile beneath the surface,
for the material and the parameters of shot peening
selected. Peenstress graphically plots the theoretical
curve based on the user inputs. By altering shot peening
parameters, the user can optimize the shot peening callout
to achieve desired results. Peenstress also contains
a large database of x-ray diffraction data that the
user can access to verify the theoretical curves. Peenstress
is particularly useful when shot peening thin cross
sections to determine anticipated depth of compression
to minimize the possibility of distortion. Engineers
can effectively reference the Peenstress profile in
load calculations.
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