371 citations · 1.7k across the 60 of their papers we have counts for
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Dislocations in the elastic fields of randomly distributed defects
Ronghai Wu, Michael Zaiser
In recent years, the behavior of dislocations in random solid solutions has received renewed interest, and several models have been discussed where random alloys are treated as eff…
Failure precursors and failure mechanisms in hierarchically patterned paper sheets in tensile and creep loading
Mahshid Pournajar, Tero Mäkinen, Seyyed Ahmad Hosseini +3
Quasi-brittle materials endowed with (statistically) self-similar hierarcical microstructures show distinct failure patterns that deviate from the standard scenario of damage accum…
Effects of disorder on deformation and failure of brittle porous materials
Jonas Ritter, Shucheta Shegufta, Michael Zaiser
The mechanical behavior of porous materials depends strongly on porosity and pore geometry, but also on morphological parameters characterizing the spatial arrangement of pores. He…
Predicting Creep Failure by Machine Learning -- Which Features Matter?
Stefan Hiemer, Paolo Moretti, Stefano Zapperi +1
Spatial and temporal features are studied with respect to their predictive value for failure time prediction in subcritical failure with machine learning (ML). Data are generated f…
Enhanced fault-tolerance in biomimetic hierarchical materials -- a simulation study
Seyyed Ahmad Hosseini, Paolo Moretti, Michael Zaiser
Hierarchical microstructures are often invoked to explain the high resilience and fracture toughness of biological materials such as bone and nacre. Biomimetic material models insp…
Relating plasticity to dislocation properties by data analysis: scaling vs. machine learning approaches
Stefan Hiemer, Haidong Fan, Michael Zaiser
Plasticity modelling has long been based on phenomenological models based on ad-hoc assuption of constitutive relations, which are then fitted to limited data. Other work is based…
A computationally efficient implementation of continuum dislocation dynamics: Formulation and application to ultrafine-grained Mg polycrystals
Xi Luo, Michael Zaiser
Continuum dislocation dynamics (CDD) represents the evolution of systems of curved and connected dislocation lines in terms of density-like field variables which include the volume…
Predicting the failure of two-dimensional silica glasses
Francesc Font-Clos, Marco Zanchi, Stefan Hiemer +4
Being able to predict the failure of materials based on structural information is a fundamental issue with enormous practical and industrial relevance for the monitoring of devices…
Atomistic aspects of load transfer and fracture in CNT-reinforced aluminium
Samaneh Nasiri, Kai Wang, Mingjun Yang +3
This paper describes atomistic simulations of deformation and fracture of Al reinforced with carbon nanotubes (CNTs). We use density functional theory (DFT) to understand the energ…
Pinning of extended dislocations in atomically disordered crystals
Aviral Vaid, De'an Wei, Erik Bitzek +2
In recent years there has been renewed interest in the behavior of dislocations in crystals that exhibit strong atomic scale disorder, as typical of compositionally complex single…
Pinning of dislocations in disordered alloys: Effects of dislocation orientation
Michael Zaiser, Ronghai Wu
The current interest in compositionally complex alloys including so called high entropy alloys has caused renewed interest in the general problem of solute hardening. It has been s…
Dislocation-CNT Interactions in Aluminium at the Atomic Level
Samaneh Nasiri, Michael Zaiser
The interaction between edge dislocations and carbon nanotubes (CNTs) embedded into an Al matrix is investigated. Both pristine and Ni-coated CNTs are considered. It is demonstrate…
Thermodynamic considerations on a class of dislocation-based constitutive models
Ronghai Wu, Michael Zaiser
Dislocations are the main carriers of plastic deformation in crystalline materials. Physically based constitutive equations of crystal plasticity typically incorporate dislocation…
Strain rate dependency of dislocation plasticity
Haidong Fan, Jaafar A. El-Awady, Qingyuan Wang +2
Dislocation slip is a general deformation mode and governs the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain r…
Constitutive modeling of the tension-compression behavior of gradient structured materials
Jianfeng Zhao, Xiaochong Lu, Jinling Liu +4
Gradient structured (GS) metals processed by severe plastic deformation techniques can be designed to achieve simultaneously high strength and high ductility. Significant kinematic…
Nickel coated carbon nanotubes in aluminum matrix composites: A multiscale simulation study
Samaneh Nasiri, Kai Wang, Mingjun Yang +2
In this work we use density functional theory (DFT) calculations to benchmark empirical potentials for the interaction between nickel and sp bonded carbon nanoparticles. These…
Grain boundary effect on nanoindentation: A multiscale discrete dislocation dynamics model
Songjiang Lu, Bo Zhang, Xiangyu Li +4
Nanoindentation is a convenient method to investigate the mechanical properties of materials on small scales by utilizing low loads and small indentation depths. However, the effec…
Microplasticity and yielding in crystals with heterogeneous dislocation distribution
Xu Zhang, Jian Xiong, Haidong Fan +1
In this study, we use discrete dislocation dynamics (DDD) simulation to investigate the effect of heterogeneous dislocation density on the transition between quasi-elastic deformat…
Cyclic-loading microstructure-property relations from a mesoscale perspective: An example of single crystal Nickel-based superalloys
Ronghai Wu, Michael Zaiser
Past models of stress-strain response under cyclic loading mainly rely on macroscopic equations which consider microstructure evolution indirectly or simply discard microstructure…
Properties of dislocation lines in crystals with strong atomic-scale disorder
Jianhui Zhai, Michael Zaiser
We use a discrete dislocation dynamics (DDD) approach to study the motion of a dislocation under strong stochastic forces that may cause bending and roughening of the dislocation l…
Cell structure formation in a two-dimensional density-based dislocation dynamics model
Ronghai Wu, Michael Zaiser
Cellular patterns formed by self-organization of dislocations are a most conspicuous feature of dislocation microstructure evolution during plastic deformation. To elucidate the ph…
Deterministic and stochastic models of dislocation patterning
Ronghai Wu, Daniel Tüzes, Péter Dusán Ispánovity +2
We study a continuum model of dislocation transport in order to investigate the formation of heterogeneous dislocation patterns. We propose a physical mechanism which relates the f…
Determining Cosserat constants of 2D cellular solids from beam models
Stefan Liebenstein, Michael Zaiser
We present results of a two-scale model of disordered cellular materials where we describe the microstructure in an idealized manner using a beam network model and then make a tran…
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…