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SPOTLIGHT TECH FATIGUE CRACK PROPAGATION(焦点科技疲劳裂纹扩展)
TECH
SPOTLIGHT FATIGUE CRACK
PROPAGATION
George asically, fatigue crack propagation can be divided Stage II SStage III
Totten* Binto three stages: stage I (short cracks), stage II
(long cracks) and stage III (final fracture). e
G.E. Totten c
a
• Stage I: Once initiated, a fatigue crack propagates f
Associates r
u
LLC along high shear stress planes (45 degrees), as S
Seattle, schematically represented in Fig. 1. This is known
Washington as stage I or the short crack growth propagation stage. Fig. 1— Stages I and II of fatigue
The crack propagates until it is decelerated by a microstructural bar-
rier such as a grain boundary, inclusions, or pearlitic zones, which crack propagation.
cannot accommodate the initial crack growth direction. Therefore,
grain refinement is capable of increasing fatigue strength of the ma-
terial by the insertion of a large quantity of microstructural barriers,
i.e. grain boundaries, which have to be overcome in the stage I of
propagation. Surface mechanical treatments such as shot peening
and surface rolling, contribute to the incre
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