65 citations · 292 across the 14 of their papers we have counts for
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A multi-physics model for dislocation driven spontaneous grain nucleation and microstructure evolution in polycrystals
Izzet Tarik Tandogan, Michael Budnitzki, Stefan Sandfeld
The granular microstructure of metals evolves significantly during thermomechanical processing through viscoplastic deformation and recrystallization. Microstructural features such…
A multi-physics model for the evolution of grain microstructure
Izzet Tarik Tandogan, Michael Budnitzki, Stefan Sandfeld
When a metal is loaded mechanically at high temperatures, i.e. above 300 C, its grain microstructure evolves due to multiple physical mechanisms. Two of which are the curvature…
A model for the interaction of dislocations with planar defects based on Allen-Cahn type microstructure evolution coupled to strain gradient elasticity
M. Budnitzki, S. Sandfeld
In classical elasticity theory the stress-field of a dislocation is characterized by a -type singularity. When such a dislocation is considered together with an Allen-Cahn-typ…
Shear relaxation behind the shock front in 110 Molybdenum - From the Atomic Scale to Continuous Dislocation Fields
Roman Kositski, Dominik Steinberger, Stefan Sandfeld +1
In this work we study shock-induced plasticity in Mo single crystals, impacted along the <110> crystal orientation. In particular, the shear relaxation behind the shock front is qu…
A continuum approach to combined evolution and dislocation plasticity in Nickel-based superalloys
Ronghai Wu, Michael Zaiser, Stefan Sandfeld
Creep in single crystal Nickel-based superalloys has been a topic of interest since decades, and nowadays simulations are more and more able to complement experiments. In these all…
Size and Disorder Effects in Elasticity of Cellular Structures: From Discrete Models to Continuum Representations
Stefan Liebenstein, Stefan Sandfeld, Michael Zaiser
Open cellular solids usually possess random microstructures that may contain a characteristic length scale, such as the cell size. This gives rise to size dependent mechanical prop…
Insights from a minimal model of dislocation-assisted rafting in single crystal Nickel-based superalloys
Ronghai Wu, Stefan Sandfeld
Nickel-based superalloys play a major role in many technologically relevant high temperature applications. Understanding and predicting the evolution of the phase microstructure du…
Continuum Representation of Systems of Dislocation Lines: A General Method for Deriving Closed-Form Evolution Equations
Mehran Monavari, Stefan Sandfeld, Michael Zaiser
Plasticity is governed by the evolution of, in general anisotropic, systems of dislocations. We seek to faithfully represent this evolution in terms of density-like variables which…
Microstructural Comparison of the Kinematics of Discrete and Continuum Dislocations Models
Stefan Sandfeld, Giacomo Po
The Continuum Dislocation Dynamics (CDD) theory and the Discrete Dislocation Dynamics (DDD) method are compared based on concise mathematical formulations of the coarse graining of…
Pattern formation in a minimal model of continuum dislocation plasticity
Stefan Sandfeld, Michael Zaiser
The spontaneous emergence of heterogeneous dislocation patterns is a conspicuous feature of plastic deformation and strain hardening of crystalline solids. Despite long-standing ef…
A link between microstructure evolution and macroscopic response in elasto-plasticity: formulation and numerical approximation of the higher-dimensional Continuum Dislocation Dynamics theory
Stefan Sandfeld, Ekkachai Thawinan, Christian Wieners
Micro-plasticity theories and models are suitable to explain and predict mechanical response of devices on length scales where the influence of the carrier of plastic deformation -…
Scaling Properties of Dislocation Simulations in the Similitude Regime
Michael Zaiser, Stefan Sandfeld
Dislocation systems exhibit well known scaling properties such as the Taylor relationship between flow stress and dislocation density, and the "law of similitude" linking the flow…
Deformation Patterns and Surface Morphology in a Minimal Model of Amorphous Plasticity
Stefan Sandfeld, Michael Zaiser
We investigate a minimal model of the plastic deformation of amorphous materials. The material elements are assumed to exhibit ideally plastic behavior (J2 plasticity). Structural…