SPOTLIGHT TECH FATIGUE CRACK PROPAGATION(焦点科技疲劳裂纹扩展).pdfVIP

SPOTLIGHT TECH FATIGUE CRACK PROPAGATION(焦点科技疲劳裂纹扩展).pdf

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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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