Cohesive law describing crack growth at iron/precipitate interfaces

Journal Article (2017)
Author(s)

Astrid Elzas (TU Delft - (OLD) MSE-7)

B.J. Thijsse (TU Delft - (OLD) MSE-7)

Research Group
(OLD) MSE-7
DOI related publication
https://doi.org/10.1016/j.commatsci.2017.01.042
More Info
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Publication Year
2017
Language
English
Research Group
(OLD) MSE-7
Volume number
134
Pages (from-to)
214-224

Abstract

Single dislocations and dislocation pile-ups at crystalline interfaces cause stress concentrations. This can lead to decohesion of the interfaces under tensile loading. To describe this decohesion quantitatively, a cohesive law for planar crack growth at iron/precipitate interfaces is developed. This cohesive law is based on a universal description of the adhesive energy for different interfaces. Only a single scaling factor c must be applied to convert the prediction based on this universal adhesive energy into the actual traction-separation behaviour during crack growth. This scaling factor takes into account the atomic strain and relaxations. The cohesive law derived here can be implemented in a Discrete Dislocation Plasticity framework to describe crack growth at a larger scale. The method presented in this paper for the derivation of a cohesive law can be applied to other material combinations showing brittle crack growth as well.

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