Geometric model for fatigue crack closure induced by fracture surface roughness

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02644803· OSTI ID:5563559

Suresh, S; Ritchie, R O

Mechanisms for fatigue crack closure under plane strain conditions have recently been identified at very low (near-threshold) stress intensities in terms of effects of excess corrosion deposits or fracture surface roughness in promoting premature closure of the crack. In the present paper, a geometric model is presented for crack closure induced by fracture surface roughness. This model specifically addresses the contribution from both Mode I and Mode II crack tip displacements in addition to considering the nature of the fracture surface morphology. The implications of this model are briefly discussed in light of the roles of grain size, yield strength, microstructure, and crack size in influencing near-threshold fatigue behavior in engineering alloys.

• Research Organization: Lawrence Berkeley Lab., CA
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5563559
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 13; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CLOSURES
CRACKS
CRYSTAL STRUCTURE
FATIGUE
GRAIN SIZE
MECHANICAL PROPERTIES
MICROSTRUCTURE
ROUGHNESS
SIZE
SURFACE PROPERTIES
YIELD STRENGTH