Modelling of growth of three-dimensional cracks by a continuous distribution of dislocation loops

• Published in: Computational mechanics Vol. 19; no. 6; pp. 538 - 544
• Main Authors: DAI, D. N, HILLS, D. A, NOWELL, D
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.05.1997; Berlin Springer Nature B.V
• Subjects: Algorithms; Computer simulation; Crack propagation; Cracks; Dislocation loops; Exact sciences and technology; Fatigue cracks; Fatigue failure; Fracture mechanics (crack, fatigue, damage...); Fracture mechanics, fatigue and cracks; Fundamental areas of phenomenology (including applications); Integral equations; Mathematical models; Physics; Singular integral equations; Solid mechanics; Structural and continuum mechanics; Three dimensional models; Singularity; Three dimensional model; Propagation velocity; Integral equations; Step by step method; Numerical method; Dislocation loops; Fatigue crack; Crack propagation
• ISSN: 0178-7675; 1432-0924
• DOI: 10.1007/s004660050206

This paper is concerned with a numerical simulation of growth of fatigue cracks in a three-dimensional geometry. A continuous distribution of infinitesimal dislocation loops is employed to model the crack faces, so that the crack problem can be formulated as a set of singular integral equations. A numerical procedure based on an analytical treatment of the associated finite part integral is developed to solve the singular integral equations. The Paris law is then used to predict the rate of crack growth, so that the evolution of the crack shape under fatigue can be traced by a step-by-step algorithm. Various crack growth problems, e.g., the growth of a subsurface crack in a surface treated specimen, are analyzed using the technique, providing new data for several cracks of practical interest.