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Contact stress analysis and fatigue life prediction for a cam-roller follower system
An analytical treatment of the fatigue performance of a cam-roller followler system as
influenced by residual stresses induced by grinding, is developed. An approach based on an
extended Hertzian analysis is used to determine the 3-D contact stress fields, which are then
combined by elastic superposition with the residual stress fields. These residual stresses were
measured previously by the x-ray diffraction technique and represent a range of grinding protocols
from mild to abusive.
The maximum cyclic component, generally occurring subsurface, is then identified in
terms of an effective stress amplitude and mean which are used with a fatigue damage model to
predict fatigue crack initiation. Results, pending experimental confirmation, appear reasonable and
provide a useful basis for optimizing cam performance in terms of manufacturing and design