A 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:5563560

Suresh, S; Ritchie, R O

Mechanisms for fatigue crack closure under plane strain conditions have recently been identified a 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: Department of Materials Science and Mineral Engineering, and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5563560
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States); ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
656000 -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
CHEMICAL REACTIONS
CLOSURES
CORROSION
CRACKS
CRYSTAL STRUCTURE
FATIGUE
FRACTURE MECHANICS
GEOMETRY
GRAIN SIZE
MATHEMATICS
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
MORPHOLOGY
ROUGHNESS
SIMULATION
SIZE
STRAINS
STRESS INTENSITY FACTORS
SURFACE PROPERTIES
YIELD STRENGTH