Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Shot Peen Impact on Life, Part 2: Single Particle Impact Tests Using Production Shot
Author: M Tufft
Source: Conf Proc: ICSP-7 (pg 254-263)
Publication year 1999
Document number: 1999036
Number of pages: 10
Abstract:
Shot peening, long recognized for its potential to increase life capability, can also cause the reverse effect. Peening intensity, independent of shot size or incidence
angle, typically correlates with residual stress profile depth observed. However, results from a designed experiment indicate that residual stress or intensity is not the
only critical factor controlling low cycle fatigue life behavior. Shot size, coverage, incidence angle and velocity or strain rate also appear to be significant. Single
particle impact tests using production shot were conducted to gain insight into the physical mechanisms and material changes corresponding to the shot peening conditions
resulting in reduced life capability. Development of microstructure and dimple profiles was studied over a range of shot velocities and incidence angles. The results of
this effort are presented here. This led to the development of a Fracture Mechanics/Threshold Behavior predictive model which is presented in Part 3. As a result, a dual
criteria for damage was developed which includes a microstructural damage depth, and an impact severity criteria which is linked to the total shot velocity.
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