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William Curtin

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Publications associées (153)

Modeling, Design, and Development of Soft Pneumatic Actuators with Finite Element Method

William Curtin, Jamie Paik, Philip Arthur Moseley, Juan Manuel Florez Marin, Harshal Arun Sonar, Gunjan Agarwal

This work presents a comprehensive open-source simulation and design tool for Soft pneumatic actuators (SPAs) using finite element method, compatible and extensible to a diverse range of soft materials and design parameters. Thorough characterization of th ...

Wiley-Blackwell2016

Parallel algorithm for multiscale atomistic/continuum simulations using LAMMPS

William Curtin, Fabio Pavia

Deformation and fracture processes in engineering materials often require simultaneous descriptions over a range of length and time scales, with each scale using a different computational technique. Here we present a high-performance parallel 3D computing ...

Iop Publishing Ltd2015

Rational design of fiber-reinforced hybrid composites: A global load sharing analysis

William Curtin, Varun Parameswaran Rajan

An analytical model based on global load sharing (GLS) theory is developed to guide design of fiber-reinforced hybrid composites with superior mechanical properties to single-fiber-type composites. The hybrid is assumed to comprise two types of fibers-low- ...

Elsevier2015

Mechanical work makes important contributions to surface chemistry at steps

William Curtin, Michael Frederick Francis

The effect of mechanical strain on the binding energy of adsorbates to late transition metals is believed to be entirely controlled by electronic factors, with tensile stress inducing stronger binding. Here we show, via computation, that mechanical strain ...

Nature Publishing Group2015

Robust atomistic calculation of dislocation line tension

William Curtin, Fabio Pavia, Benjamin Alexander Szajewski

The line tension Gamma of a dislocation is an important and fundamental property ubiquitous to continuum scale models of metal plasticity. However, the precise value of Gamma in a given material has proven difficult to assess, with literature values encomp ...

Institute of Physics2015

Computational Design of Strain in Core-Shell Nanoparticles for Optimizing Catalytic Activity

William Curtin, Philip Arthur Moseley

Surface strains in core–shell nanoparticles modify catalytic activity. Here, a continuum-based strategy enables accurate surface-strain-based screening and design of core–shell systems using minimal input as a means to enhance catalytic activity. The appro ...

American Chemical Society2015

Brittle and ductile crack-tip behavior in magnesium

William Curtin

The competition between dislocation emission and cleavage at a crack tip plays an important role in governing the intrinsic fracture behavior of crystalline materials. This competition is not well understood in magnesium, which has many different combinati ...

Elsevier2015

Assessment of phase-field-crystal concepts using long-time molecular dynamics

William Curtin, Kristopher Learion Baker

The ability of the phase-field-crystal (PFC) model to quantitatively predict atomistic defect structures in crystalline solids is addressed. First, general aspects of the PFC model are discussed within the context of obtaining quantitative results in solid ...

American Physical Society2015

The origins of high hardening and low ductility in magnesium

William Curtin, Zhaoxuan Wu

Magnesium is a lightweight structural metal but it exhibits low ductility-connected with unusual, mechanistically unexplained, dislocation and plasticity phenomena-which makes it difficult to form and use in energy-saving lightweight structures. We employ ...

Nature Publishing Group2015

Analysis of spurious image forces in atomistic simulations of dislocations

William Curtin, Benjamin Alexander Szajewski

Molecular dynamics simulations of dislocation/obstacle interactions are enhancing our physical understanding of plasticity. However, despite increasing computational power, the interaction between simulation cell boundaries and the long ranged fields of di ...

Institute of Physics2015

Magnesium interatomic potential for simulating plasticity and fracture phenomena

William Curtin, Michael Frederick Francis

Magnesium has multiple dislocation and twinning systems with starkly different properties, which make its plastic deformation strongly anisotropic and highly complex. Existing empirical interatomic potentials fail to capture the full scope of these propert ...

Institute of Physics2015

Diffusion on Demand to Control Precipitation Aging: Application to Al-Mg-Si Alloys

William Curtin, Michael Frederick Francis

We demonstrate experimentally that a part-per-million addition of Sn solutes in Al-Mg-Si alloys can inhibit natural aging and enhance artificial aging. The mechanism controlling the aging is argued to be vacancy diffusion, with solutes trapping vacancies a ...

American Physical Society2014

Solute strengthening of twinning dislocations in Mg alloys

William Curtin, Maryam Ghazisaeidi

Solute strengthening of twin dislocation motion along an existing twin boundary in Mg–X (X = Al, Zn) is investigated using a new Labusch-type weak pinning model. First, the View the MathML source(101¯2) twinning dislocation structure is computed using firs ...

Elsevier2014

Mechanisms of hydrogen-enhanced localized plasticity: An atomistic study using alpha-Fe as a model system

William Curtin

Atomistic simulations of the effects of H on edge dislocation mobility and pile-ups are performed to investigate possible nanoscale mechanisms for hydrogen-enhanced localized plasticity (HELP). alpha-Fe is used as a model system because H diffusion is fast ...

Elsevier2014

Pullout of rough multiwall carbon nanotubes: A parametric study

William Curtin

A finite element study of MWCNT pullout from a ceramic matrix with a rough fibre-matrix interface is presented. MWCNT pullout differs in several ways from pullout of solid, micro-scale fibres, and has not been studied before. Interfacial roughness, due to ...

Elsevier2014

A New Mechanism for Twin Growth in Mg Alloys

William Curtin, Aitor Luque Gomez, Maryam Ghazisaeidi

Twinning is an important deformation mode in lightweight Mg alloys, but the mechanisms of nucleation and growth of twins and their interactions with solutes remain largely unresolved. Here, a new model for thermally-activated, stress-driven growth of twin ...

Elsevier2014

First-principles core structures of < c+a > edge and screw dislocations in Mg

William Curtin, Maryam Ghazisaeidi

The core structures of < c + a > edge and screw dislocations in Mg are computed using density functional theory (DFT). Both types dissociate into two 1/2 < c + a > partials on the second-order pyramidal planes. These DFT results are then allowed to relax w ...

Elsevier2014

Quantum-to-continuum prediction of ductility loss in aluminium-magnesium alloys due to dynamic strain aging

William Curtin, Shyam Mohan Keralavarma

Negative strain-rate sensitivity due to dynamic strain aging in Aluminium-5XXX alloys leads to reduced ductility and plastic instabilities at room temperature, inhibiting application of these alloys in many forming processes. Here a hierarchical multiscale ...

Nature Publishing Group2014

Investigation of crack tip dislocation emission in aluminum using multiscale molecular dynamics simulation and continuum modeling

William Curtin, Derek Warner

This work investigates the dislocation nucleation processes that occur at the tip of a crack in aluminum under a broad range of crystallographic orientations and temperatures. A concurrent multiscale molecular dynamics - continuum simulation framework is e ...

Elsevier2014

Atomic mechanism and prediction of hydrogen embrittlement in iron

William Curtin

Hydrogen embrittlement in metals has posed a serious obstacle to designing strong and reliable structural materials for many decades, and predictive physical mechanisms still do not exist. Here, a new H embrittlement mechanism operating at the atomic scale ...

Nature Publishing Group2013

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