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MM: Fachverband Metall- und Materialphysik

MM 38: Topical Session: Fundamentals of Fracture - Atomistic Modelling

MM 38.4: Vortrag

Mittwoch, 13. März 2013, 16:00–16:15, H4

Studying Short Cracks with a 3D Multiscale Model — •Steffen Brinckmann — Max Planck Institut für Eisenforschung

Grooves and notches act as initiation sites for short cracks, which grow into size and lead to a failure of the structure. To understand the fundamentals of short cracks, a multiscale model is warranted, which accounts for fracture on the atomistic level, while covering plasticity on a micrometer length scale.

Multiple multiscale models exist, which cover these intrinsic length scales: atomistic separation by Molecular Dynamics and micrometer plasticity by Dislocation Dynamics. In the past, these models were restricted to two dimensional configurations, which limited their applicability and altered the fundamental deformation behavior of the metal.

In this contribution a three-dimensional, concurrent multiscale model of Molecular and Dislocation Dynamics is introduced and applied to microscale plasticity around a short penny-shaped notches, which is located at the free surface. Since this contribution is the first-time presentation of the three-dimensional model AtoDis, a full description of the mechanical model, especially at the interface is given.

The talk will close with remaining challenges in the current model and a general discussion about model verification, which is applicable to multiple of the currently developed multiscale models.