Stress Field Modeling in Context of Industrial Shot Peening
Author: Langdon Feltner and Paul Mort | Purdue University
Source: The Shot Peener magazine, Vol 37, Issue 3, Summer 2023
Doc ID: 2023023
Year of Publication: 2023
Abstract:
Abstract
The compressive stress field imparted by shot peening has
distributed surface and depth profiles relating to media characteristics
and impact conditions. While the average surface
stress and depth profile may be consistent over a large area,
variability depends on the local scale of scrutiny—for example,
in relation to a feature size of the part being treated, or size of
peening media. In this paper, we analyze datasets obtained
from finite element modeling of peening with media having
experimentally-measured size and shape distributions, with
detailed attention to the variance of the stress fields over a
range of reference scales.
Industrial shot peening – a distributed process
Considering industrial shot peening as a distributed set of
discrete impacts, one can assess stress field uniformity based
on spatial and temporal variation of surface impacts during the
peening process. Fundamentally, shot peening is a stochastic
process, with thousands of individual particles impacting
each part in random positions (Miao et al., 2009). While the
resulting surface stress may be fairly uniform averaged over
the full part, the local variability of the stress field increases as
the scale of scrutiny approaches the shot size. In this paper, we
consider the systematic analysis of stress field averaging and
quantification of its scale-dependent variability.
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