Concept

Fragilisation par l'hydrogène

Publications associées (137)

Syngas generation from n-butane with an integrated MEMS assembly for gas processing in micro-solid oxide fuel cell systems

Paul Muralt, Thomas Maeder, Bo Jiang, Dimos Poulikakos

An integrated system of a microreformer and a carrier allowing for syngas generation from liquefied petroleum gas (LPG) for micro-SOFC application is discussed. The microreformer with an overall size of 12.7 mm × 12.7 mm × 1.9 mm is fabricated with micro-e ...

Royal Soc Chemistry2012

Exohedral Hydrogen Chemisorption on a Carbon Nanotube: The Clustering Effect

Wanda Andreoni, Fabio Pietrucci, Alessandro Curioni

Density functional theory-based calculations of the (10,0) zigzag single-walled carbon nanotube with hydrogen chemisorbed exohedrally show that electron pairing and strain minimization lead hydrogen atoms to cluster and preferentially sit in axial configur ...

2012

Effects of uniaxial stress on alkali-silica reaction induced expansion of concrete

Karen Scrivener, Cyrille Dunant

ASR affected concrete in real structures is usually subject to loads which affect the macroscopic expansion of the material. An experimental study was undertaken using sensors embedded in reactive and non-reactive samples loaded on modified creep frames. N ...

Elsevier2012

A nanoscale mechanism of hydrogen embrittlement in metals

William Curtin

The embrittlement of metallic systems by hydrogen is a widespread phenomenon but the precise role of hydrogen in this process is not well understood and predictive mechanisms are not available. Here, a new model is proposed wherein hydrogen accumulation ar ...

2011

Helium-induced hardening effect in ferritic/martensitic steels F82H and Optimax-A irradiated in a mixed spectrum of high energy protons and spallation neutrons

Yong Dai

Ferritic/martensitic (FM) steels, F82H and Optimax-A, were irradiated up to 11.3 dpa/1175 appm He in Target-3 of the Swiss Spallation Neutron Source (SINQ). To investigate helium-induced hardening effect, micro-hardness and microstructure of the irradiated ...

Elsevier2011

Multi-walled carbon nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature

Daniele Mari, Robert Schaller, Mehdi Mazaheri, Gilbert Fantozzi

Multi-walled carbon nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5-5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly at ...

Elsevier2011

Materials research under ITER-like divertor conditions at FOM Rijnhuizen

Wouter Vijvers

At FOM Rijnhuizen, linear plasma generators are used to investigate plasma-material interactions under high-density (

Elsevier2011

Ultra-low power palladium-coated MEMS resonators for hydrogen detection under ambient conditions

Jürgen Brugger, Luis Guillermo Villanueva Torrijo, Jonas Gustav Henriksson

We present a novel approach for hydrogen gas detection, based on palladium-coated micromechanical resonators. A sequence of thin film technniques allows the large-scale parallel fabrication of free-standing beams separated from a counter-electrode by a mes ...

IEEE2011

Coupling quantum and continuum scales to predict crack tip dislocation nucleation

William Curtin, Derek Warner

A quantum-continuum multiscale coupling of Kohn-Sham density functional theory to continuum material is presented that can handle mechanics problems in metals when long-range stress fields are present, such as occurs for dislocations and cracks. The method ...

2010

Porosity in Aluminum Alloys

Milan Felberbaum

Porosity is one of the major defects in castings because it reduces the mechanical properties of a cast piece [1]. Porosity formation results from the effect of two concomitant mechanisms, namely solidification shrinkage and segregation/precipitation of ga ...

EPFL2010

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