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On the numerical modeling of nucleation and growth of microstructurally short cracks in polycrystals under cyclic loading

Published online by Cambridge University Press:  17 September 2019

Martin Boeff ,
Hamad ul Hassan Open the ORCID record for Hamad ul Hassan [Opens in a new window]  and
Alexander Hartmaier Open the ORCID record for Alexander Hartmaier [Opens in a new window]
Martin Boeff
Affiliation:
Interdisciplinary Centre for Advanced Materials Simulation, Ruhr-Universität Bochum, Bochum 44801, Germany
Hamad ul Hassan*
Affiliation:
Interdisciplinary Centre for Advanced Materials Simulation, Ruhr-Universität Bochum, Bochum 44801, Germany
Alexander Hartmaier
Affiliation:
Interdisciplinary Centre for Advanced Materials Simulation, Ruhr-Universität Bochum, Bochum 44801, Germany
*
a)Address all correspondence to this author. e-mail: Hamad.ulhassan@rub.de
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Abstract

In the scope of this work, a micromechanical model based on the crystal plasticity finite element method is proposed and applied to describe the nucleation and growth of microstructurally short fatigue cracks in polycrystalline materials under cyclic loads. The microstructure is generated in the form of a representative volume element of a polycrystalline material with equiaxed grains having columnar structure along thickness and random crystallographic texture. With this model, we investigate the influence of loading amplitude on the crack growth behavior. It is shown that for smaller strain amplitudes, a single crack nucleates and propagates, while for larger strain amplitudes several independent crack nucleation sites form, from which microcracks start propagating. It is also observed that the global plastic strain amplitude decreases from the initial to the final cycle, during total strain-controlled loading. However, this can even increase the crack growth rate because the crack advance is governed by the local plastic slip which accumulates at the crack tip over the number of cycles. With this work, it is shown that micromechanical modeling can strongly improve our understanding of the mechanisms of short-crack nucleation and growth under fatigue loading.

Keywords

fatiguesimulationmicrostructure
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 20 , 28 October 2019 , pp. 3523 - 3534
Copyright
Copyright © Materials Research Society 2019 

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