On the plastic zone size and crack tip opening displacement of a Dugdale crack interacting with a circular inclusion

• Published in: Acta mechanica 2010-03, Vol.210 (3-4), p.305-314
• Main Authors: Hoh, H. J., Xiao, Z. M., Luo, J.
• Format: Article
• Language: English
• Subjects: Classical and Continuum Physics; Condensed matter: structure, mechanical and thermal properties; Control; Cracks; Defects and impurities in crystals; microstructure; Dynamical Systems; Engineering; Engineering Thermodynamics; Exact sciences and technology; Fracture mechanics; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Heat and Mass Transfer; Linear defects: dislocations, disclinations; Mathematics; Mechanical engineering; Physics; Solid Mechanics; Structural and continuum mechanics; Structure of solids and liquids; crystallography; Theoretical and Applied Mechanics; Vibration
• ISSN: 0001-5970; 1619-6937
• DOI: 10.1007/s00707-009-0211-2

An analytical investigation on the plastic zone size (PZS) of a crack near a circular inclusion has been carried out. Both the crack and the circular inclusion are embedded in an infinite matrix, with the crack oriented along the radial direction of the inclusion. In the solution procedure, the crack is simulated as a continuous distribution of edge dislocations. With the Dugdale model of small scale yielding, two stripe plastic zones at both crack tips are introduced. Using the solution of a circular inclusion interacting with a single dislocation as the Green’s function, the physical problem is formulated as a set of singular integral equations. With the aid of Erdogan and Gupta’s method and iterative numerical procedures, the singular integral equations are solved numerically for the PZS and the crack tip opening displacement. The results obtained in the current work can be reduced to those simpler cases of the Dugdale model.