CREEP DAMAGE MECHANICS AND MICROMECHANISMS

By M. Ashby, B. Dyson. 2013

159 citations recorded by the source corpus.

ABSTRACT Creep fracture is the end result of the accumulation of damage during creep. In this paper, micromechanisms of damage are classified, and a methodology of analysis is developed. For each mechanism, a damage-evolution law and a creep-law is derived. The result is a pair of differential equations, with the same form as that of the continuum treatment of Kachanov and Rabotnov. The equations can be integrated to give the shape of the creep curve, the time and strain to fracture, residual life, and so forth. Each mechanism exhibits a characteristic shape of creep curve, with an associated Monkman-Grant constant and creep ductility; these give guidance in selecting and using the appropriate equations. Progress is made in unifying the continuum and micromechanistic approaches to creep fracture, and a method is presented for identifying the dominant damage mechanism (or class of mechanism) from the shape of the tensile creep curve. An overview of the contents of this paper can be obtained by reading Sections 1, 2, 3 and 5.

Subfields: Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/c71803b59e225c9a45876e7e2076c75633a5ab51

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In Mechanical Engineering

1. T. Dean
2. Jianguo Lin
3. H. Hallberg

In Mechanics of Materials

1. T. Dean
2. Jianguo Lin
3. H. Hallberg

Citations in the corpus

• A Review on Damage Mechanisms, Models and Calibration Methods under Various Deformation Conditions (2005, background): “Creep in these materials is therefore not controlled by dislocation recovery but is best thought of in terms of the kinetics of dislocation multiplication and subsequent motion (Ashby and Dyson, 1984a).”