Visual simulation of fatigue crack growth

An attempt has been made to visually simulate fatigue crack propagation from a precrack. An integrated program was developed for this purpose. The crack-tip shape was determined at four load positions in the first load cycle. The final shape was a blunt front with an “ear” profile at the precrack ti...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 1998-07, Vol.29 (7), p.1923-1931
Main Authors: SHUANZHU WANG, MARGOLIN, H, LIN, F.-B
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crack propagation
Crack tips
Ductile fracture
Exact sciences and technology
Fatigue failure
Fatigue, brittleness, fracture, and cracks
Fracture mechanics
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
Shear strain
Simulation
Striations
Two phase materials
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Summary:An attempt has been made to visually simulate fatigue crack propagation from a precrack. An integrated program was developed for this purpose. The crack-tip shape was determined at four load positions in the first load cycle. The final shape was a blunt front with an “ear” profile at the precrack tip. A more general model, schematically illustrating the mechanism of fatigue crack growth and striation formation in a ductile material, was proposed based on this simulation. According to the present model, fatigue crack growth is an intermittent process; cyclic plastic shear strain is the driving force applied to both state I and II crack growth. No fracture mode transition occurs between the two stages in the present study. The crack growth direction alternates, moving up and down successively, producing fatigue striations. A brief examination has been made of the crack growth path in a ductile two-phase material.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-998-0017-1