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Helena Van Swygenhoven

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Publications associées (65)

A crystallographic extension to the Olson-Cohen model for predicting strain path dependence of martensitic transformation

Helena Van Swygenhoven, Efthymios Polatidis

A modification to the empirical Olson-Cohen strain-induced austenite to martensite transformation kinetic model is proposed. The proposed kinetic model accounts for the stress state at the grain level and the crystallography of the transformation mechanism ...

PERGAMON-ELSEVIER SCIENCE LTD2019

A High Resolution Digital Image Correlation Study under Multiaxial Loading

Helena Van Swygenhoven, Wei-Neng Hsu, Efthymios Polatidis

In this study, a miniaturized cruciform-shaped sample geometry which allows reaching high plastic strain under equibiaxial loading with reduced thickness at the test section is presented. The thinning method results in excellent surface quality that can be ...

SPRINGER2019

Impact of in situ nanomechanics on physical metallurgy

Johann Michler, Helena Van Swygenhoven, Efthymios Polatidis

The mechanical response of modern alloys results from a complex interplay between existing microstructure and its evolution with time under stress. To unravel these processes, in situ approaches intrinsically have a critical advantage to explore the basic ...

2019

Deformation and degradation of superelastic NiTi under multiaxial loading

Helena Van Swygenhoven, Steven Van Petegem, Wei-Neng Hsu, Efthymios Polatidis, Nicola Casati

The degradation of the superelastic properties of a commercial NiTi alloy is studied during uniaxial, biaxial and load-path-change cycling performed in-situ with synchrotron X-ray diffraction. Careful examination of the diffraction pattern during uniaxial ...

2019

Microstructure evolution of stainless steel subjected to biaxial load path changes: In-situ neutron diffraction and multi-scale modeling

Helena Van Swygenhoven

The lattice strain and intensity evolution obtained from in-situ neutron diffraction experiments of 316L cruciform samples subjected to 45 degrees and 90 degrees load path changes are presented and predicted using the multi-scale modeling approach proposed ...

2019

Large scale 3-dimensional atomistic simulations of screw dislocations interacting with coherent twin boundaries in Al, Cu and Ni under uniaxial and multiaxial loading conditions

Helena Van Swygenhoven, Satish I Rao

Large scale 3D atomistic simulations are performed to study the interaction between a curved dislocation with a dominant screw character and a Coherent Twin Boundary (CTB). Three FCC metals (Al, Cu and Ni) are addressed using 6 embedded-atom method (EAM) p ...

2019

Dislocation interactions at reduced strain rates in atomistic simulations of nanocrystalline Al

Helena Van Swygenhoven

2018

Load path change on superelastic NiTi alloys: In situ synchrotron XRD and SEM DIC

Helena Van Swygenhoven, Steven Van Petegem, Wei-Neng Hsu, Efthymios Polatidis, Nicola Casati

2018

Mechanical response of stainless steel subjected to biaxial load path changes: Cruciform experiments and multi-scale modeling

Helena Van Swygenhoven, Steven Van Petegem

2018

Suppressed martensitic transformation under biaxial loading in low stacking fault energy metastable austenitic steels

Helena Van Swygenhoven, Wei-Neng Hsu, Efthymios Polatidis

2018

Stresses and Strains in Cruciform Samples Deformed in Tension

Helena Van Swygenhoven, Steven Van Petegem

The stress and strain relationship in the gauge region of six cruciform geometries is studied: the ISO standard geometry with slits in arms, two geometries with thinned gauge areas, two geometries with thinned gauge areas and slits in arms, and one modifie ...

Springer2017

Characterization of the deformation and phase transformation behavior of VC-free and VC-containing FeMnSi-based shape memory alloys by in situ neutron diffraction

Helena Van Swygenhoven, Christian Leinenbach, Steven Van Petegem

The stress-induced fcc-austenite to hcp-martensite transformation in the iron based shape memory alloy (SMA) Fe-17Mn-5Si-10Cr-4Ni with and without VC precipitates is investigated by in-situ neutron diffraction measurements upon uniaxial loading and unloadi ...

Elsevier Science Sa2017

Laue micro-diffraction and crystal plasticity finite element simulations to reveal a vein structure in fatigued Cu

Helena Van Swygenhoven, Nicolò Grilli, Ainara Irastorza Landa

The formation of a vein during cyclic shearing of a single copper crystal oriented for single slip can be followed in transmission Laue diffraction by analyzing the spatially resolved lattice rotation evolution. Because Laue transmission integrates the sig ...

2017

Intergranular Strain Evolution During Biaxial Loading: A Multiscale FE-FFT Approach

Helena Van Swygenhoven, Steven Van Petegem

Predicting the macroscopic and microscopic mechanical response of metals and alloys subjected to complex loading conditions necessarily requires a synergistic combination of multiscale material models and characterization techniques. This article focuses o ...

Springer2017

Deformation behavior of nanoporous polycrystalline silver. Part I: Microstructure and mechanical properties

Helena Van Swygenhoven, Steven Van Petegem

This work reports on the microstructure and mechanical properties of porous silver films produced with different sintering parameters. The microstructure is investigated by high-resolution ptychographic Xray computed tomography and scanning electron micros ...

Pergamon-Elsevier Science Ltd2017

A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

Helena Van Swygenhoven, Steven Van Petegem

A novel miniaturized biaxial deformation rig is presented. It allows one to apply in-plane biaxial stress states with arbitrary stress ratios and to perform strain path changes on thin-sheet metals. The device is optimized for in situ usage inside a scanni ...

Springer2017

Deformation behavior of nano-porous polycrystalline silver. Part II: Simulations

Joël Cugnoni, Helena Van Swygenhoven, Steven Van Petegem

Three-dimensional finite element simulations of nano-porous silver structures are performed to understand the correlation between the porous morphology and the mechanical behavior. The nano structures have been obtained from ptychographic X-ray computed to ...

Elsevier2017

An in-situ synchrotron study on microplastic flow of electrodeposited nanocrystalline nickel

Helena Van Swygenhoven, Steven Van Petegem

Deformation in nanocrystalline (NC) materials is strongly influenced by the presence of a large fraction of grain boundaries. We present a comparative study on the role of intragranular root-mean-square strain and crystal-lographic texture on recovery proc ...

Elsevier Science Sa2017

Effect of pre-existing immobile dislocations on the evolution of geometrically necessary dislocations during fatigue

Helena Van Swygenhoven, Nicolò Grilli, Ainara Irastorza Landa

The role of pre-existing mobile and immobile dislocation densities on the evolution of geometrical necessary dislocation densities (GNDs) during cyclic fatigue in shear is studied using a continuum dislocation-based model incorporated in a crystal plastici ...

2017

Frequency-Induced Bulk Magnetic Domain-Wall Freezing Visualized by Neutron Dark-Field Imaging

Helena Van Swygenhoven

We use neutron dark-field imaging to visualize and interpret the response of bulk magnetic domain walls to static and dynamic magnetic excitations in (110)-Goss textured iron silicon high-permeability steel alloy. We investigate the domain-wall motion unde ...

American Physical Society (APS)2016

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